diff --git a/static/js/app/authSession.js b/static/js/app/authSession.js
index ffb6f6bc..f756c8b9 100644
--- a/static/js/app/authSession.js
+++ b/static/js/app/authSession.js
@@ -115,7 +115,7 @@ async function checkAuthentication() {
                         window.location.href = '/login?source=session_expired';
                         return;
                     }
-                } catch (err) {
+                } catch (_err) {
                     localStorage.removeItem(USER_DATA_KEY);
                     window.location.href = '/login?source=session_expired';
                     return;
@@ -128,9 +128,11 @@ async function checkAuthentication() {
             console.log('No cached user data, fetching from server');
             try {
                 const freshData = await refreshUserData();
-                if (freshData && freshData.username) {
+                if (freshData?.username) {
                     const userInitials = freshData.username.substring(0, 2).toUpperCase();
-                    document.querySelectorAll('.user-avatar, .user-menu-avatar').forEach((el) => (el.textContent = userInitials));
+                    document.querySelectorAll('.user-avatar, .user-menu-avatar').forEach((el) => {
+                        el.textContent = userInitials;
+                    });
                     window.updateStorageUsageDisplay(freshData);
                     resolveHomeFolder().then(() => window.loadFiles());
                 } else {
diff --git a/static/js/app/filesView.js b/static/js/app/filesView.js
index abdee799..4faa2221 100644
--- a/static/js/app/filesView.js
+++ b/static/js/app/filesView.js
@@ -35,7 +35,7 @@ async function getFolder(id) {
         cache: 'no-store'
     };
 
-    let folderInformations = await fetch(`/api/folders/${id}`, requestOptions);
+    const folderInformations = await fetch(`/api/folders/${id}`, requestOptions);
     if (folderInformations.ok) {
         return folderInformations.json();
     } else {
@@ -67,7 +67,7 @@ async function rebuildBreadCrumb() {
     while (id !== null) {
         console.log(`fetching folder information for folder ${id}`);
         try {
-            let folderInfo = await getFolder(id);
+            const folderInfo = await getFolder(id);
 
             // store the Leaf which is the current folder
             if (currentFolderInfo === null) {
@@ -84,7 +84,7 @@ async function rebuildBreadCrumb() {
 
             // iterate to parent folder
             id = folderInfo.parent_id;
-        } catch (e) {
+        } catch (_e) {
             console.log(`Error loading information from folder ${app.currentPath}, falling back to ${app.userHomeFolderId}`);
             // fallback of root
             window.uiNotifications.show(
@@ -110,7 +110,6 @@ async function rebuildBreadCrumb() {
  */
 async function loadFiles(options = { insertHistory: true }) {
     const app = window.app;
-    const elements = window.appElements;
 
     try {
         console.log('Starting loadFiles() - loading files...', options);
@@ -125,7 +124,7 @@ async function loadFiles(options = { insertHistory: true }) {
         window.isLoadingFiles = true;
 
         // This to avoid blinking page, a better solution would be to put loading on an overlay and remove timeout
-        let loadingFiles = setTimeout(() => {
+        const loadingFiles = setTimeout(() => {
             // display loader after few delay (will be canceled if result take less time)
             window.ui.showError(`
                 <div class="files-loading-spinner">
@@ -139,7 +138,7 @@ async function loadFiles(options = { insertHistory: true }) {
             await window.resolveHomeFolder();
         }
 
-        const timestamp = new Date().getTime();
+        const timestamp = Math.floor(Date.now() / 1000);
 
         await rebuildBreadCrumb();
 
@@ -181,7 +180,6 @@ async function loadFiles(options = { insertHistory: true }) {
 
         if (forceRefresh) {
             url += `&force_refresh=true`;
-            // @ts-ignore
             requestOptions.headers['X-Force-Refresh'] = 'true';
             console.log('Forcing complete refresh ignoring cache');
         }
@@ -226,7 +224,7 @@ async function loadFiles(options = { insertHistory: true }) {
                 let fileFound = null;
 
                 // lookup for the given fle
-                for( const file of fileList) {
+                for (const file of fileList) {
                     if (file.id === window.app.viewFile) {
                         fileFound = file;
                         break;
@@ -236,14 +234,13 @@ async function loadFiles(options = { insertHistory: true }) {
                 if (fileFound) {
                     console.log(`file ${window.app.viewFile} found, calling viewer`);
                     await window.inlineViewer.openFile(fileFound);
-                }
-                else {
+                } else {
                     // remove file
                     console.log(`file ${window.app.viewFile} not found`);
                     window.app.viewFile = null;
 
                     // correct url/history as file is not found
-                    window.updateHistory( false);
+                    window.updateHistory(false);
                 }
             }
         }
diff --git a/static/js/app/main.js b/static/js/app/main.js
index d0414757..7b90552f 100644
--- a/static/js/app/main.js
+++ b/static/js/app/main.js
@@ -126,7 +126,7 @@ function setActionsBarMode(mode, force = false) {
     elements.gridViewBtn = document.getElementById('grid-view-btn');
     elements.listViewBtn = document.getElementById('list-view-btn');
 
-    if (window.i18n && window.i18n.translateElement) {
+    if (window.i18n?.translateElement) {
         window.i18n.translateElement(elements.actionsBar);
     }
 
@@ -231,8 +231,8 @@ function deserializeHash() {
 
     if (hash_elements[1] === 'files' && hash_elements[2] === 'folder' && hash_elements[3] !== null) {
         hashContext.path = hash_elements[3];
-        
-        if (hash_elements[4] == 'file' && hash_elements[5] !== null) {
+
+        if (hash_elements[4] === 'file' && hash_elements[5] !== null) {
             hashContext.file = hash_elements[5];
         }
     }
@@ -248,7 +248,7 @@ function deserializeHash() {
 function updateHistory(insertHistory) {
     const app = window.app;
 
-    let historyData = {
+    const historyData = {
         section: app.currentSection,
         id: app.currentFolder,
         file: app.viewFile
@@ -261,7 +261,7 @@ function updateHistory(insertHistory) {
         historyUrl = historyUrl.concat('/folder/', app.currentFolderInfo.id);
 
         if (window.app.viewFile) {
-            historyUrl = historyUrl.concat('/file/', window.app.viewFile);   
+            historyUrl = historyUrl.concat('/file/', window.app.viewFile);
         }
         // update title
         document.title = `OxiCloud: ${app.currentFolderInfo.path}`;
@@ -325,7 +325,7 @@ function initApp() {
     cacheElements();
 
     // Initialize file sharing module first
-    if (window.fileSharing && window.fileSharing.init) {
+    if (window.fileSharing?.init) {
         window.fileSharing.init();
     } else {
         console.warn('fileSharing module not fully initialized');
@@ -349,7 +349,7 @@ function initApp() {
     }
 
     // Initialize favorites module if available
-    if (window.favorites && window.favorites.init) {
+    if (window.favorites?.init) {
         console.log('Initializing favorites module');
         window.favorites.init();
     } else {
@@ -357,7 +357,7 @@ function initApp() {
     }
 
     // Initialize recent files module if available
-    if (window.recent && window.recent.init) {
+    if (window.recent?.init) {
         console.log('Initializing recent files module');
         window.recent.init();
     } else {
@@ -365,21 +365,21 @@ function initApp() {
     }
 
     // Initialize multi-select / batch actions
-    if (window.multiSelect && window.multiSelect.init) {
+    if (window.multiSelect?.init) {
         console.log('Initializing multi-select module');
         window.multiSelect.init();
     }
 
     window.addEventListener('authenticationDone', () => {
         // Check if a context was provided in the URL
-        let hashContext = deserializeHash();
+        const hashContext = deserializeHash();
         switchSectionTo(hashContext.section);
         if (hashContext.section === 'files') {
             if (hashContext.path) {
                 console.log(`init: reusing folder from hash URL: ${hashContext.path}`);
                 window.app.currentPath = hashContext.path;
             }
-            
+
             if (hashContext.file !== null) {
                 window.app.viewFile = hashContext.file;
             }
@@ -388,7 +388,7 @@ function initApp() {
     });
 
     // Wait for translations to load before checking authentication
-    if (window.i18n && window.i18n.isLoaded && window.i18n.isLoaded()) {
+    if (window.i18n?.isLoaded?.()) {
         // Translations already loaded, proceed with authentication
         window.checkAuthentication();
     } else {
@@ -401,7 +401,7 @@ function initApp() {
 
         // Set a timeout as a fallback in case translations take too long
         setTimeout(() => {
-            if (!window.i18n || !window.i18n.isLoaded || !window.i18n.isLoaded()) {
+            if (!window.i18n?.isLoaded?.()) {
                 console.warn('Translations loading timeout, proceeding with authentication anyway');
                 window.checkAuthentication();
             }
@@ -451,7 +451,9 @@ function setupUploadDropdown() {
             e.stopPropagation();
             const isOpen = menu.classList.contains('show');
             // Close any other open dropdowns
-            document.querySelectorAll('.upload-dropdown-menu.show').forEach((m) => m.classList.remove('show'));
+            document.querySelectorAll('.upload-dropdown-menu.show').forEach((m) => {
+                m.classList.remove('show');
+            });
             if (!isOpen) {
                 menu.classList.add('show');
             }
@@ -462,14 +464,14 @@ function setupUploadDropdown() {
     // Close dropdown when clicking outside
     // remove+add stable handler: guarantees exactly one global listener
     if (uploadDropdownDocumentClickHandler) {
-        // @ts-ignore
         document.removeEventListener('click', uploadDropdownDocumentClickHandler);
     }
     uploadDropdownDocumentClickHandler = (e) => {
         if (e.target.closest('#upload-dropdown')) return;
-        document.querySelectorAll('.upload-dropdown-menu.show').forEach((m) => m.classList.remove('show'));
+        document.querySelectorAll('.upload-dropdown-menu.show').forEach((m) => {
+            m.classList.remove('show');
+        });
     };
-    // @ts-ignore
     document.addEventListener('click', uploadDropdownDocumentClickHandler);
 }
 
@@ -587,13 +589,15 @@ function setupEventListeners() {
     elements.navItems.forEach((item) => {
         item.addEventListener('click', () => {
             // Remove active class from all nav items
-            elements.navItems.forEach((navItem) => navItem.classList.remove('active'));
+            elements.navItems.forEach((navItem) => {
+                navItem.classList.remove('active');
+            });
 
             // Add active class to clicked item
             item.classList.add('active');
             let _updateHistory = true;
 
-            let itemI18nKey = item.querySelector('span').getAttribute('data-i18n');
+            const itemI18nKey = item.querySelector('span').getAttribute('data-i18n');
             switch (itemI18nKey) {
                 case 'nav.shared':
                     // Switch to shared view
@@ -712,7 +716,7 @@ function updateStorageUsageDisplay(userData) {
         storageInfo.removeAttribute('data-i18n');
 
         // Use i18n if available
-        if (window.i18n && window.i18n.t) {
+        if (window.i18n?.t) {
             storageInfo.textContent = window.i18n.t('storage.used', {
                 percentage: usagePercentage,
                 used: usedFormatted,
diff --git a/static/js/app/navigation.js b/static/js/app/navigation.js
index 2ebf9643..6cd52d19 100644
--- a/static/js/app/navigation.js
+++ b/static/js/app/navigation.js
@@ -127,7 +127,7 @@ function getSectionFromNavItem(navItem) {
  * @returns {boolean} true if the section changed
  */
 function setCurrentSection(section) {
-    if (window.app.currentSection == section) return false;
+    if (window.app.currentSection === section) return false;
 
     // Set all view flags - true for active section, false for others
     Object.entries(VIEW_FLAGS).forEach(([key, flag]) => {
diff --git a/static/js/app/searchView.js b/static/js/app/searchView.js
index 7f687d40..2dfcfc85 100644
--- a/static/js/app/searchView.js
+++ b/static/js/app/searchView.js
@@ -42,7 +42,7 @@ async function performSearch(query, sortBy) {
 
 document.addEventListener('search-resort', (e) => {
     const searchInput = document.querySelector('.search-container input');
-    if (searchInput && searchInput.value.trim()) {
+    if (searchInput?.value.trim()) {
         performSearch(searchInput.value.trim(), e.detail.sort_by);
     }
 });
diff --git a/static/js/app/trashView.js b/static/js/app/trashView.js
index 065e13c9..9ad63788 100644
--- a/static/js/app/trashView.js
+++ b/static/js/app/trashView.js
@@ -8,7 +8,7 @@ async function loadTrashItems() {
     try {
         if (window.multiSelect) window.multiSelect.clear();
         window.ui.resetFilesList(); // ensure also list visible & error hidden
-        const _tt = window.i18n && window.i18n.t ? window.i18n.t : (k) => k.split('.').pop();
+        const _tt = window.i18n?.t ? window.i18n.t : (k) => k.split('.').pop();
         elements.filesList.innerHTML = `
             <div class="list-header trash-header">
                 <div data-i18n="files.name">${_tt('files.name')}</div>
@@ -53,8 +53,8 @@ function addTrashItemToView(item) {
         iconClass = item.icon_class || 'fas fa-folder';
         typeLabel = window.i18n ? window.i18n.t('files.file_types.folder') : 'Folder';
     } else {
-        iconClass = item.icon_class || (window.ui && window.ui.getIconClass ? window.ui.getIconClass(item.name) : 'fas fa-file');
-        iconSpecialClass = window.ui && window.ui.getIconSpecialClass ? window.ui.getIconSpecialClass(item.name) : '';
+        iconClass = item.icon_class || (window.ui?.getIconClass ? window.ui.getIconClass(item.name) : 'fas fa-file');
+        iconSpecialClass = window.ui?.getIconSpecialClass ? window.ui.getIconSpecialClass(item.name) : '';
         const cat = item.category || '';
         typeLabel = cat
             ? window.i18n
diff --git a/static/js/app/ui.js b/static/js/app/ui.js
index 6e30a43f..d7a967cc 100644
--- a/static/js/app/ui.js
+++ b/static/js/app/ui.js
@@ -359,7 +359,7 @@ const ui = {
                 // First try directory-aware extraction (Finder folder drag & drop)
                 const droppedEntries = await collectDroppedEntries(e.dataTransfer);
                 if (droppedEntries && droppedEntries.length > 0) {
-                    const hasFolderStructure = droppedEntries.some((x) => x.relativePath && x.relativePath.includes('/'));
+                    const hasFolderStructure = droppedEntries.some((x) => x.relativePath?.includes('/'));
                     if (hasFolderStructure) {
                         fileOps.uploadFolderEntries(droppedEntries);
                     } else {
@@ -372,7 +372,7 @@ const ui = {
                 }
 
                 // Detect folder drops: files from folder drops have webkitRelativePath set
-                const hasRelativePaths = Array.from(e.dataTransfer.files).some((f) => f.webkitRelativePath && f.webkitRelativePath.includes('/'));
+                const hasRelativePaths = Array.from(e.dataTransfer.files).some((f) => f.webkitRelativePath?.includes('/'));
                 if (hasRelativePaths) {
                     fileOps.uploadFolderFiles(e.dataTransfer.files);
                 } else {
@@ -415,7 +415,7 @@ const ui = {
                 // First try directory-aware extraction (Finder folder drag & drop)
                 const droppedEntries = await collectDroppedEntries(e.dataTransfer);
                 if (droppedEntries && droppedEntries.length > 0) {
-                    const hasFolderStructure = droppedEntries.some((x) => x.relativePath && x.relativePath.includes('/'));
+                    const hasFolderStructure = droppedEntries.some((x) => x.relativePath?.includes('/'));
                     if (hasFolderStructure) {
                         fileOps.uploadFolderEntries(droppedEntries);
                     } else {
@@ -428,7 +428,7 @@ const ui = {
                 }
 
                 // Detect folder drops: files from folder drops have webkitRelativePath set
-                const hasRelativePaths = Array.from(e.dataTransfer.files).some((f) => f.webkitRelativePath && f.webkitRelativePath.includes('/'));
+                const hasRelativePaths = Array.from(e.dataTransfer.files).some((f) => f.webkitRelativePath?.includes('/'));
                 if (hasRelativePaths) {
                     fileOps.uploadFolderFiles(e.dataTransfer.files);
                 } else {
@@ -474,13 +474,11 @@ const ui = {
     updateBreadcrumb() {
         const breadcrumb = document.querySelector('.breadcrumb');
         breadcrumb.innerHTML = '';
-
-        const self = this;
         const path = window.app.breadcrumbPath; // [{id, name}, ...]
 
         // Helper function to safely get translation text
         const getTranslatedText = (key, defaultValue) => {
-            if (!window.i18n || !window.i18n.t) return defaultValue;
+            if (!window.i18n?.t) return defaultValue;
             return window.i18n.t(key);
         };
 
@@ -496,7 +494,7 @@ const ui = {
             homeIcon.addEventListener('click', () => {
                 window.app.breadcrumbPath = [];
                 window.app.currentPath = window.app.userHomeFolderId;
-                self.updateBreadcrumb();
+                this.updateBreadcrumb();
                 window.loadFiles();
             });
         }
@@ -535,7 +533,7 @@ const ui = {
                 item.addEventListener('click', () => {
                     window.app.breadcrumbPath = path.slice(0, index + 1);
                     window.app.currentPath = segment.id;
-                    self.updateBreadcrumb();
+                    this.updateBreadcrumb();
                     window.loadFiles();
                 });
 
@@ -543,7 +541,7 @@ const ui = {
                 // dragover – only folders are valid drop targets
                 item.addEventListener('dragover', (e) => {
                     const card = e.target.closest('span');
-                    if (!card || !card.dataset.folderId) return;
+                    if (!card?.dataset.folderId) return;
                     e.preventDefault();
                     card.classList.add('drop-target');
                 });
@@ -552,7 +550,7 @@ const ui = {
                 item.addEventListener('dragleave', (e) => {
                     console.log('dragleave ', e);
                     const card = e.target.closest('span');
-                    if (!card || !card.dataset.folderId) return;
+                    if (!card?.dataset.folderId) return;
                     card.classList.remove('drop-target');
                 });
 
@@ -567,7 +565,7 @@ const ui = {
                     card.classList.remove('drop-target');
 
                     const action = e.dataTransfer?.dropEffect;
-                    await self._dropToFolder(action, targetFolderId, e.dataTransfer);
+                    await this._dropToFolder(action, targetFolderId, e.dataTransfer);
                 });
             } else {
                 // Last segment: current location, not clickable
@@ -693,7 +691,7 @@ const ui = {
     },
 
     _upsertById(arr, item) {
-        if (!Array.isArray(arr) || !item || !item.id) return;
+        if (!Array.isArray(arr) || !item?.id) return;
         const idx = arr.findIndex((x) => x && x.id === item.id);
         if (idx >= 0) {
             arr[idx] = item;
@@ -709,11 +707,11 @@ const ui = {
      * @param {any} dataTransfer fallback if nothing is selected
      */
     async _dropToFolder(action, targetFolderId, dataTransfer) {
-        let selection = window.multiSelect.getSelection(targetFolderId);
+        const selection = window.multiSelect.getSelection(targetFolderId);
 
         window.multiSelect.clear();
 
-        if (selection.fileIds.length == 0 && selection.folderIds.length == 0) {
+        if (selection.fileIds.length === 0 && selection.folderIds.length === 0) {
             // try to use dataTransfer (direct move without selection)
             const id = dataTransfer.getData('text/plain');
             const isFolder = dataTransfer.getData('application/oxicloud-folder') === 'true';
@@ -785,8 +783,6 @@ const ui = {
         if (!filesList) return;
         this._delegationReady = true;
 
-        const self = this;
-
         // ── helpers ────────────────────────────────────────────────
         const itemInfo = (card) => {
             if (!card) return null;
@@ -796,7 +792,7 @@ const ui = {
                     type: 'file',
                     id: fileId,
                     name: card.dataset.fileName,
-                    data: self._items.get(fileId)
+                    data: this._items.get(fileId)
                 };
             const folderId = card.dataset.folderId;
             if (folderId)
@@ -804,7 +800,7 @@ const ui = {
                     type: 'folder',
                     id: folderId,
                     name: card.dataset.folderName,
-                    data: self._items.get(folderId)
+                    data: this._items.get(folderId)
                 };
             return null;
         };
@@ -818,25 +814,23 @@ const ui = {
             // But NOT image files - those should be previewed in the inline viewer
             const ext = (file.name || '').split('.').pop().toLowerCase();
             const imageExts = ['jpg', 'jpeg', 'png', 'gif', 'svg', 'webp', 'bmp', 'ico', 'heic', 'heif', 'avif', 'tiff'];
-            const isImage = (file.mime_type && file.mime_type.startsWith('image/')) || imageExts.includes(ext);
+            const isImage = file.mime_type?.startsWith('image/') || imageExts.includes(ext);
             try {
-                if (!isImage && window.wopiEditor && await window.wopiEditor.canEdit(file.name)) {
-                    await window.wopiEditor.openInModal(file.id, file.name, 'edit')
+                if (!isImage && window.wopiEditor && (await window.wopiEditor.canEdit(file.name))) {
+                    await window.wopiEditor.openInModal(file.id, file.name, 'edit');
                     return;
                 }
-            }
-            catch (e) {
+            } catch (e) {
                 console.warn(`WOPI Editor failed, falling bck to classic view `, e);
             }
 
-            if (self.isViewableFile(file) || isImage) {
+            if (this.isViewableFile(file) || isImage) {
                 if (window.inlineViewer) {
                     window.inlineViewer.openFile(file);
                     // update history
                     window.app.viewFile = file.id;
                     window.updateHistory(false);
-                }
-                else {
+                } else {
                     window.fileOps.downloadFile(file.id, file.name);
                 }
             } else {
@@ -849,7 +843,7 @@ const ui = {
             const folderName = card.dataset.folderName;
             window.app.breadcrumbPath.push({ id: folderId, name: folderName });
             window.app.currentPath = folderId;
-            self.updateBreadcrumb();
+            this.updateBreadcrumb();
             window.loadFiles();
         };
 
@@ -940,7 +934,7 @@ const ui = {
                 window.contextMenus.syncFavoriteOptionLabels();
             }
             if (window.contextMenus && typeof window.contextMenus.syncWopiOptionVisibility === 'function') {
-                window.contextMenus.syncWopiOptionVisibility().catch(function () {});
+                window.contextMenus.syncWopiOptionVisibility().catch(() => {});
             }
             menu.style.left = `${e.pageX}px`;
             menu.style.top = `${e.pageY}px`;
@@ -949,7 +943,7 @@ const ui = {
 
         // dragstart
         filesList.addEventListener('dragstart', (e) => {
-            let card = e.target.closest('.file-item');
+            const card = e.target.closest('.file-item');
             if (!card) {
                 e.preventDefault();
                 return;
@@ -968,11 +962,11 @@ const ui = {
             // allow copy or move (handled by the browser)
             e.dataTransfer.effectAllowed = 'copyMove';
 
-            self.draggedItems = document.createElement('div');
-            self.draggedItems.className = 'dragged-items';
+            this.draggedItems = document.createElement('div');
+            this.draggedItems.className = 'dragged-items';
 
             let selectedCardFromList = filesList.querySelectorAll(`div.selected > div.name-cell`);
-            if (selectedCardFromList.length == 0) {
+            if (selectedCardFromList.length === 0) {
                 // fallback to current element
                 selectedCardFromList = card.querySelectorAll('div.name-cell');
             }
@@ -982,8 +976,8 @@ const ui = {
             let lastItemDiv = null;
 
             while (index < selectedCardFromList.length && index < maxElements) {
-                let iconCell = document.createElement('div');
-                let icon = selectedCardFromList[index].getElementsByClassName('file-icon').item(0)?.cloneNode(true);
+                const iconCell = document.createElement('div');
+                const icon = selectedCardFromList[index].getElementsByClassName('file-icon').item(0)?.cloneNode(true);
                 if (icon) {
                     iconCell.appendChild(icon);
                     iconCell.querySelectorAll('img')?.forEach((img) => {
@@ -991,28 +985,28 @@ const ui = {
                     });
                 }
 
-                let nameCell = document.createElement('div');
-                let name = selectedCardFromList[index].getElementsByTagName('span').item(0)?.cloneNode(true);
+                const nameCell = document.createElement('div');
+                const name = selectedCardFromList[index].getElementsByTagName('span').item(0)?.cloneNode(true);
                 if (name) {
                     nameCell.appendChild(name);
                 }
 
-                let div = document.createElement('div');
+                const div = document.createElement('div');
                 div.className = 'file-item';
                 div.appendChild(iconCell);
                 div.appendChild(nameCell);
 
-                self.draggedItems.appendChild(div);
+                this.draggedItems.appendChild(div);
                 index += 1;
                 lastItemDiv = div;
             }
 
             // if more than 1 item, display the badge
             if (selectedCardFromList.length > 1) {
-                let badge = document.createElement('span');
+                const badge = document.createElement('span');
                 badge.className = 'dragged-items-badge';
                 badge.innerText = `${selectedCardFromList.length}`;
-                self.draggedItems.appendChild(badge);
+                this.draggedItems.appendChild(badge);
             }
 
             // if more than maxElements display the fading
@@ -1020,14 +1014,16 @@ const ui = {
                 lastItemDiv.classList.add('fading');
             }
 
-            self.dragPreview.appendChild(self.draggedItems);
-            e.dataTransfer.setDragImage(self.draggedItems, 0, 0);
+            this.dragPreview.appendChild(this.draggedItems);
+            e.dataTransfer.setDragImage(this.draggedItems, 0, 0);
         });
 
         // dragend
-        filesList.addEventListener('dragend', (e) => {
-            self.dragPreview.removeChild(self.draggedItems);
-            document.querySelectorAll('.drop-target').forEach((el) => el.classList.remove('drop-target'));
+        filesList.addEventListener('dragend', (_e) => {
+            this.dragPreview.removeChild(this.draggedItems);
+            document.querySelectorAll('.drop-target').forEach((el) => {
+                el.classList.remove('drop-target');
+            });
         });
 
         // dragover – only folders are valid drop targets
@@ -1057,7 +1053,7 @@ const ui = {
             card.classList.remove('drop-target');
 
             const action = e.dataTransfer.dropEffect;
-            await self._dropToFolder(action, targetFolderId, e.dataTransfer);
+            await this._dropToFolder(action, targetFolderId, e.dataTransfer);
         });
     },
 
@@ -1111,8 +1107,8 @@ const ui = {
 
             // SVG icon path (after icons.js replacement)
             const svg = starBtn.querySelector('svg');
-            const filledPath = window.OxiIcons && window.OxiIcons['star'];
-            const outlinePath = window.OxiIcons && window.OxiIcons['star-outline'];
+            const filledPath = window.OxiIcons?.star;
+            const outlinePath = window.OxiIcons?.['star-outline'];
             const targetPath = isFavorite ? filledPath : outlinePath;
             if (svg && targetPath) {
                 const p = svg.querySelector('path');
@@ -1159,7 +1155,7 @@ const ui = {
         el.dataset.folderName = folder.name;
         el.dataset.parentId = folder.parent_id || '';
 
-        const isFav = window.favorites && window.favorites.isFavorite(folder.id, 'folder');
+        const isFav = window.favorites?.isFavorite(folder.id, 'folder');
         const formattedDate = window.formatDateTime(folder.modified_at);
 
         el.innerHTML = `
@@ -1203,7 +1199,7 @@ const ui = {
               : 'Document';
         const fileSize = file.size_formatted || window.formatFileSize(file.size);
         const formattedDate = window.formatDateTime(file.modified_at);
-        const isFav = window.favorites && window.favorites.isFavorite(file.id, 'file');
+        const isFav = window.favorites?.isFavorite(file.id, 'file');
 
         const el = document.createElement('div');
         el.className = 'file-item';
@@ -1213,7 +1209,7 @@ const ui = {
         el.setAttribute('draggable', 'true');
 
         el.innerHTML = `
-            
+
             <div class="checkbox-cell"><input type="checkbox" class="item-checkbox"></div>
             <div class="name-cell">
                 <div class="file-icon ${iconSpecialClass}">
@@ -1262,7 +1258,7 @@ const ui = {
                 <div></div><!-- actions -->
             </div>`;
 
-        if (window.i18n && window.i18n.translateElement) window.i18n.translateElement(filesList);
+        if (window.i18n?.translateElement) window.i18n.translateElement(filesList);
 
         filesList.classList.remove('hidden');
         filesContainerError?.classList.add('hidden');
@@ -1286,7 +1282,7 @@ const ui = {
         const filesList = document.getElementById('files-list');
         if (filesContainerError) filesContainerError.innerHTML = content;
 
-        if (window.i18n && window.i18n.translateElement) window.i18n.translateElement(filesContainerError);
+        if (window.i18n?.translateElement) window.i18n.translateElement(filesContainerError);
 
         filesContainerError?.classList.remove('hidden');
         filesList?.classList.add('hidden');
@@ -1384,7 +1380,9 @@ function toggleCardSelection(card, event) {
  */
 function showContextMenuAtElement(triggerElement, menuId) {
     // Hide any open menus first
-    document.querySelectorAll('.context-menu').forEach((m) => (m.style.display = 'none'));
+    document.querySelectorAll('.context-menu').forEach((m) => {
+        m.style.display = 'none';
+    });
 
     const menu = document.getElementById(menuId);
     if (!menu) return;
@@ -1406,7 +1404,7 @@ function showContextMenuAtElement(triggerElement, menuId) {
         window.contextMenus.syncFavoriteOptionLabels();
     }
     if (window.contextMenus && typeof window.contextMenus.syncWopiOptionVisibility === 'function') {
-        window.contextMenus.syncWopiOptionVisibility().catch(function () {});
+        window.contextMenus.syncWopiOptionVisibility().catch(() => {});
     }
 
     menu.style.left = `${left}px`;
diff --git a/static/js/app/uiFileTypes.js b/static/js/app/uiFileTypes.js
index 0e7157a8..dd1f5761 100644
--- a/static/js/app/uiFileTypes.js
+++ b/static/js/app/uiFileTypes.js
@@ -6,7 +6,7 @@
 const uiFileTypes = {
     // TODO: 'd better to use a canViw() method in inlineViewer
     isViewableFile(file) {
-        if (!file || !file.mime_type) return false;
+        if (!file?.mime_type) return false;
         if (file.mime_type.startsWith('image/')) return true;
         if (file.mime_type === 'application/pdf') return true;
         if (file.mime_type.startsWith('audio/')) return true;
diff --git a/static/js/app/userMenu.js b/static/js/app/userMenu.js
index 4fac01d4..9096c26f 100644
--- a/static/js/app/userMenu.js
+++ b/static/js/app/userMenu.js
@@ -171,7 +171,7 @@ function updateUserMenuData() {
     const quotaBytes = userData.storage_quota_bytes == null ? 10 * 1024 * 1024 * 1024 : userData.storage_quota_bytes;
     const percentage = quotaBytes > 0 ? Math.min(Math.round((usedBytes / quotaBytes) * 100), 100) : 0;
 
-    if (storageFill) storageFill.style.width = percentage + '%';
+    if (storageFill) storageFill.style.width = `${percentage}%`;
     if (storageText) {
         const used = window.formatFileSize(usedBytes);
         const total = window.formatQuotaSize(quotaBytes);
@@ -206,7 +206,7 @@ function showUserProfileModal() {
     const percentage = quotaBytes > 0 ? Math.min(Math.round((usedBytes / quotaBytes) * 100), 100) : 0;
     const barColor = percentage > 90 ? '#ef4444' : percentage > 70 ? '#f59e0b' : '#22c55e';
 
-    const t = (key, fallback) => (window.i18n && window.i18n.t ? window.i18n.t(key) || fallback : fallback);
+    const t = (key, fallback) => (window.i18n?.t ? window.i18n.t(key) || fallback : fallback);
 
     const existing = document.getElementById('profile-modal-overlay');
     if (existing) existing.remove();
@@ -220,7 +220,7 @@ function showUserProfileModal() {
                 <div class="about-modal-avatar">${initials}</div>
                 <h3 class="about-modal-username">${username}</h3>
                 <p class="about-modal-email">${email}</p>
-                <span class="about-modal-role ${role === 'admin' ? 'about-modal-role-admin' : 'about-modal-role-user'}">${role === 'admin' ? '🛡️ Admin' : '👤 ' + t('user_menu.role_user', 'User')}</span>
+                <span class="about-modal-role ${role === 'admin' ? 'about-modal-role-admin' : 'about-modal-role-user'}">${role === 'admin' ? '🛡️ Admin' : `👤 ${t('user_menu.role_user', 'User')}`}</span>
             </div>
             <div class="about-modal-storage">
                 <div class="about-modal-storage-label">
@@ -240,7 +240,7 @@ function showUserProfileModal() {
     // Set dynamic bar width and color via JS property (CSP-safe)
     const barFill = overlay.querySelector('#about-bar-fill');
     if (barFill) {
-        barFill.style.width = percentage + '%';
+        barFill.style.width = `${percentage}%`;
         barFill.style.background = barColor;
     }
 
diff --git a/static/js/core/csrf.js b/static/js/core/csrf.js
index a589d4a7..c8c3159e 100644
--- a/static/js/core/csrf.js
+++ b/static/js/core/csrf.js
@@ -19,7 +19,7 @@ function getCsrfToken() {
     return match ? match.split('=')[1] : '';
 }
 
-// eslint-disable-next-line no-unused-vars
+// biome-ignore lint/correctness/noUnusedVariables: global function
 function getCsrfHeaders() {
     const token = getCsrfToken();
     return token ? { 'X-CSRF-Token': token } : {};
diff --git a/static/js/core/formatters.js b/static/js/core/formatters.js
index 1dbb416a..774a65cf 100644
--- a/static/js/core/formatters.js
+++ b/static/js/core/formatters.js
@@ -5,7 +5,7 @@
 
 function escapeHtml(str) {
     if (typeof str !== 'string') return '';
-    return str.replace(/&/g, '&amp;').replace(/</g, '&lt;').replace(/>/g, '&gt;').replace(/\"/g, '&quot;').replace(/'/g, '&#039;');
+    return str.replace(/&/g, '&amp;').replace(/</g, '&lt;').replace(/>/g, '&gt;').replace(/"/g, '&quot;').replace(/'/g, '&#039;');
 }
 
 function formatFileSize(bytes) {
@@ -15,7 +15,7 @@ function formatFileSize(bytes) {
     const sizes = ['Bytes', 'KB', 'MB', 'GB', 'TB'];
     const i = Math.floor(Math.log(bytes) / Math.log(k));
 
-    return parseFloat((bytes / Math.pow(k, i)).toFixed(2)) + ' ' + sizes[i];
+    return `${parseFloat((bytes / k ** i).toFixed(2))} ${sizes[i]}`;
 }
 
 /// Formats a byte count for quota display. When bytes is 0, returns "∞" (unlimited).
@@ -34,14 +34,14 @@ function formatDateTime(value) {
     } else {
         dateValue = new Date(value);
     }
-    if (isNaN(dateValue.getTime())) return String(value);
-    return dateValue.toLocaleDateString() + ' ' + dateValue.toLocaleTimeString([], { hour: '2-digit', minute: '2-digit' });
+    if (Number.isNaN(dateValue.getTime())) return String(value);
+    return `${dateValue.toLocaleDateString()} ${dateValue.toLocaleTimeString([], { hour: '2-digit', minute: '2-digit' })}`;
 }
 
 function formatDateShort(value) {
     if (!value) return 'N/A';
     const dateValue = typeof value === 'number' ? new Date(value * 1000) : new Date(value);
-    if (isNaN(dateValue.getTime())) return String(value);
+    if (Number.isNaN(dateValue.getTime())) return String(value);
     return dateValue.toLocaleDateString(undefined, {
         year: 'numeric',
         month: 'short',
diff --git a/static/js/core/i18n.js b/static/js/core/i18n.js
index 8382d2ca..01c9d28f 100644
--- a/static/js/core/i18n.js
+++ b/static/js/core/i18n.js
@@ -6,7 +6,7 @@
  */
 
 // Current locale code (default to browser locale if available, fallback to English)
-let currentLocale = (navigator.language && navigator.language.substring(0, 2)) || (navigator.userLanguage && navigator.userLanguage.substring(0, 2)) || 'en';
+let currentLocale = navigator.language?.substring(0, 2) || navigator.userLanguage?.substring(0, 2) || 'en';
 
 // Supported locales (languages that have locale files on the server)
 // When a locale file is not found, the system gracefully falls back to English
@@ -93,6 +93,8 @@ function getNestedValue(obj, path) {
  * @param {object} params - Parameters to replace in the translation (e.g., {name: 'John'})
  * @returns {string} - The translated string or the key itself if not found
  */
+
+// biome-ignore lint/correctness/noUnusedVariables: global function
 function t(key, params = {}) {
     // Get translation from cache
     const localeData = translations[currentLocale];
@@ -131,8 +133,8 @@ function t(key, params = {}) {
 
     if (!value) {
         // Try fallback to English
-        if (currentLocale !== 'en' && translations['en']) {
-            let fallbackValue = getNestedValue(translations['en'], key);
+        if (currentLocale !== 'en' && translations.en) {
+            let fallbackValue = getNestedValue(translations.en, key);
 
             if (!fallbackValue) {
                 const aliasMap = {
@@ -143,7 +145,7 @@ function t(key, params = {}) {
                 };
                 const aliasKey = aliasMap[key];
                 if (aliasKey) {
-                    fallbackValue = getNestedValue(translations['en'], aliasKey);
+                    fallbackValue = getNestedValue(translations.en, aliasKey);
                 }
             }
 
@@ -304,8 +306,8 @@ function safeT(key, params = {}) {
     let value = getNestedValue(localeData, key);
 
     // Fallback to English
-    if (!value && currentLocale !== 'en' && translations['en']) {
-        value = getNestedValue(translations['en'], key);
+    if (!value && currentLocale !== 'en' && translations.en) {
+        value = getNestedValue(translations.en, key);
     }
 
     if (!value) return key;
diff --git a/static/js/core/icons.js b/static/js/core/icons.js
index d2745df9..e6938360 100644
--- a/static/js/core/icons.js
+++ b/static/js/core/icons.js
@@ -10,8 +10,6 @@
  * https://fontawesome.com/license/free
  */
 
-'use strict';
-
 // ── Icon registry ──────────────────────────────────────────────
 // Each entry: [viewBox-width, svg-path-d]
 // All icons use viewBox="0 0 {width} 512" and fill="currentColor".
@@ -379,7 +377,7 @@ function oxiIcon(name, extraClass) {
     const entry = _ICONS[name];
     if (!entry) return '';
     const [w, d] = entry;
-    const cls = extraClass ? 'oxi-icon ' + extraClass : 'oxi-icon';
+    const cls = extraClass ? `oxi-icon ${extraClass}` : 'oxi-icon';
     return `<svg class="${cls}" viewBox="0 0 ${w} 512" aria-hidden="true"><path fill="currentColor" d="${d}"/></svg>`;
 }
 
@@ -423,8 +421,8 @@ function replaceIconsInElement(container) {
         }
 
         // Use outline variant if available and element uses "far"
-        if (isRegular && _ICONS[iconName + '-outline']) {
-            iconName = iconName + '-outline';
+        if (isRegular && _ICONS[`${iconName}-outline`]) {
+            iconName = `${iconName}-outline`;
         }
 
         if (!iconName || !_ICONS[iconName]) continue;
@@ -433,12 +431,12 @@ function replaceIconsInElement(container) {
 
         // Build SVG element
         const svg = document.createElementNS('http://www.w3.org/2000/svg', 'svg');
-        svg.setAttribute('viewBox', '0 0 ' + w + ' 512');
+        svg.setAttribute('viewBox', `0 0 ${w} 512`);
         svg.setAttribute('aria-hidden', 'true');
 
         let svgClass = 'oxi-icon';
         if (isSpin) svgClass += ' oxi-icon-spin';
-        if (extraClasses.length) svgClass += ' ' + extraClasses.join(' ');
+        if (extraClasses.length) svgClass += ` ${extraClasses.join(' ')}`;
         svg.setAttribute('class', svgClass);
 
         // Copy inline style if present
@@ -479,7 +477,7 @@ window.OxiIcons = _ICONS;
     }
 
     // Observe future mutations (dynamic renders, modals, etc.)
-    new MutationObserver(function (mutations) {
+    new MutationObserver((mutations) => {
         if (raf) return;
         for (let i = 0; i < mutations.length; i++) {
             if (mutations[i].addedNodes.length) {
diff --git a/static/js/core/notifications.js b/static/js/core/notifications.js
index 08fa2818..86315ccc 100644
--- a/static/js/core/notifications.js
+++ b/static/js/core/notifications.js
@@ -14,8 +14,6 @@
  */
 
 const notifications = (() => {
-    'use strict';
-
     /* ── state ──────────────────────────────────────────────── */
     let _badgeCount = 0;
     let _batchSeq = 0;
@@ -126,7 +124,7 @@ const notifications = (() => {
 
         // If panel is closed, bump badge
         const wrapper = $('notif-wrapper');
-        if (!wrapper || !wrapper.classList.contains('open')) {
+        if (!wrapper?.classList.contains('open')) {
             _incrementBadge();
         }
         _showEmptyIfNeeded();
@@ -141,7 +139,7 @@ const notifications = (() => {
      * @param {string} [folderName]  root folder name (for folder uploads)
      */
     function addUploadBatch(totalFiles, folderName) {
-        const batchId = 'batch-' + ++_batchSeq;
+        const batchId = `batch-${++_batchSeq}`;
         const body = $('notif-panel-body');
         if (!body) return batchId;
 
@@ -217,9 +215,9 @@ const notifications = (() => {
             if (!shouldUpdate) return;
 
             // Show just the file name being uploaded (truncate long paths)
-            const curEl = $(batchId + '-current');
+            const curEl = $(`${batchId}-current`);
             if (curEl) {
-                const shortName = fileName.length > 50 ? '…' + fileName.slice(-49) : fileName;
+                const shortName = fileName.length > 50 ? `…${fileName.slice(-49)}` : fileName;
                 curEl.textContent = shortName;
             }
             batch.lastLabelFile = fileName;
@@ -228,10 +226,10 @@ const notifications = (() => {
             // Update progress bar with per-file granularity:
             // overall% = (completed_files + current_file_fraction) / total_files
             const overallPct = Math.round(((batch.completed + pct / 100) / batch.totalFiles) * 100);
-            const fillEl = $(batchId + '-fill');
-            const pctEl = $(batchId + '-pct');
-            if (fillEl) fillEl.style.width = overallPct + '%';
-            if (pctEl) pctEl.textContent = overallPct + '%';
+            const fillEl = $(`${batchId}-fill`);
+            const pctEl = $(`${batchId}-pct`);
+            if (fillEl) fillEl.style.width = `${overallPct}%`;
+            if (pctEl) pctEl.textContent = `${overallPct}%`;
         }
     }
 
@@ -250,15 +248,15 @@ const notifications = (() => {
         if (!isLast && batch.completed % 5 !== 0) return;
 
         const pctVal = Math.round((batch.completed / batch.totalFiles) * 100);
-        const fillEl = $(batchId + '-fill');
-        const pctEl = $(batchId + '-pct');
-        const statsEl = $(batchId + '-stats');
+        const fillEl = $(`${batchId}-fill`);
+        const pctEl = $(`${batchId}-pct`);
+        const statsEl = $(`${batchId}-stats`);
 
         const t = window.i18n?.t || ((k) => k);
         const filesLabel = t('upload.files');
 
-        if (fillEl) fillEl.style.width = pctVal + '%';
-        if (pctEl) pctEl.textContent = pctVal + '%';
+        if (fillEl) fillEl.style.width = `${pctVal}%`;
+        if (pctEl) pctEl.textContent = `${pctVal}%`;
         if (statsEl) statsEl.textContent = `${batch.completed} / ${batch.totalFiles} ${filesLabel}`;
     }
 
@@ -269,7 +267,7 @@ const notifications = (() => {
         const batch = _batches[batchId];
         if (!batch) return;
 
-        const fillEl = $(batchId + '-fill');
+        const fillEl = $(`${batchId}-fill`);
         if (fillEl) {
             fillEl.style.width = '100%';
             fillEl.classList.add(successCount === totalFiles ? 'done' : 'error');
@@ -279,11 +277,10 @@ const notifications = (() => {
         const iconEl = batch.el.querySelector('.notif-item-icon');
 
         // Clear the current-file label
-        const curEl = $(batchId + '-current');
+        const curEl = $(`${batchId}-current`);
         if (curEl) curEl.textContent = '';
 
         const t = window.i18n?.t || ((k) => k);
-        const filesLabel = t('upload.files');
         const completeText = t('upload.complete', {
             count: successCount,
             total: totalFiles
@@ -302,7 +299,7 @@ const notifications = (() => {
 
         // If the panel is closed, bump badge
         const wrapper = $('notif-wrapper');
-        if (!wrapper || !wrapper.classList.contains('open')) {
+        if (!wrapper?.classList.contains('open')) {
             _incrementBadge();
         }
     }
@@ -312,7 +309,9 @@ const notifications = (() => {
         const body = $('notif-panel-body');
         if (!body) return;
         // Remove all notif-items
-        body.querySelectorAll('.notif-item').forEach((el) => el.remove());
+        body.querySelectorAll('.notif-item').forEach((el) => {
+            el.remove();
+        });
         _clearBadge();
         _showEmptyIfNeeded();
         // automatically close notification center on clear
diff --git a/static/js/core/sw-register.js b/static/js/core/sw-register.js
index 5e4de4d0..99d354cd 100644
--- a/static/js/core/sw-register.js
+++ b/static/js/core/sw-register.js
@@ -1,12 +1,12 @@
 // Service Worker registration — runs after page load.
 if ('serviceWorker' in navigator) {
-    window.addEventListener('load', function () {
+    window.addEventListener('load', () => {
         navigator.serviceWorker
             .register('/sw.js')
-            .then(function () {
+            .then(() => {
                 /* registered */
             })
-            .catch(function (err) {
+            .catch((err) => {
                 console.log('Service Worker registration failed:', err);
             });
     });
diff --git a/static/js/features/auth/auth.js b/static/js/features/auth/auth.js
index 4e72c20b..a4f71e39 100644
--- a/static/js/features/auth/auth.js
+++ b/static/js/features/auth/auth.js
@@ -378,7 +378,7 @@ function detectBrowserLanguage() {
 // Build a language option element (card style)
 function buildLanguageCard(lang, isSelected) {
     const item = document.createElement('div');
-    item.className = 'lang-picker-item' + (isSelected ? ' selected' : '');
+    item.className = `lang-picker-item${isSelected ? ' selected' : ''}`;
     item.setAttribute('data-lang', lang.code);
     item.setAttribute('role', 'option');
     item.setAttribute('aria-selected', isSelected);
@@ -397,7 +397,6 @@ function initLanguageSelector() {
     const continueBtn = document.getElementById('language-continue');
     const picker = document.getElementById('lang-picker');
     const pickerSelected = document.getElementById('lang-picker-selected');
-    const pickerDropdown = document.getElementById('lang-picker-dropdown');
     const pickerList = document.getElementById('lang-picker-list');
     const pickerFlag = document.getElementById('lang-picker-flag');
     const pickerName = document.getElementById('lang-picker-name');
@@ -510,7 +509,7 @@ function initLanguageSelector() {
         localStorage.setItem(FIRST_RUN_KEY, 'true');
 
         // Update i18n if available
-        if (window.i18n && window.i18n.setLocale) {
+        if (window.i18n?.setLocale) {
             await window.i18n.setLocale(selectedLanguage);
         }
 
@@ -633,7 +632,7 @@ async function configureOidcLoginUI() {
         // Update button text with provider name
         const btnTextEl = oidcBtn.querySelector('span');
         if (btnTextEl && oidcInfo.provider_name) {
-            const template = window.i18n && window.i18n.t ? window.i18n.t('auth.sso_login_provider') : 'Sign in with {{provider}}';
+            const template = window.i18n?.t ? window.i18n.t('auth.sso_login_provider') : 'Sign in with {{provider}}';
             btnTextEl.textContent = template.replace('{{provider}}', oidcInfo.provider_name);
         }
 
@@ -658,7 +657,7 @@ async function configureOidcLoginUI() {
 }
 
 // DOM elements
-let loginPanel, registerPanel, adminSetupPanel, languagePanel;
+let loginPanel, registerPanel, adminSetupPanel;
 let loginForm, registerForm, adminSetupForm;
 let loginError, registerError, registerSuccess, adminSetupError;
 
@@ -725,7 +724,7 @@ let authInitialized = false;
 // and clear auth data to break the loop
 (() => {
     // Check if we're being redirected in a loop
-    const refreshAttempts = parseInt(localStorage.getItem('refresh_attempts') || '0');
+    const refreshAttempts = parseInt(localStorage.getItem('refresh_attempts') || '0', 10);
     const redirectSource = new URLSearchParams(window.location.search).get('source');
 
     // Case 1: High refresh attempts
@@ -749,7 +748,7 @@ let authInitialized = false;
     }
 
     // Case 3: Multiple redirects in short time
-    const lastCleanup = parseInt(localStorage.getItem('last_emergency_clean') || '0');
+    const lastCleanup = parseInt(localStorage.getItem('last_emergency_clean') || '0', 10);
     const timeSinceCleanup = Date.now() - lastCleanup;
 
     if (lastCleanup > 0 && timeSinceCleanup < 10000) {
@@ -931,7 +930,7 @@ if (isLoginPage && registerForm) {
         }
 
         try {
-            const data = await register(username, email, password);
+            await register(username, email, password);
 
             // Show success message
             const successMsg = window.i18n ? window.i18n.t('auth.account_success') : 'Account created successfully! You can now log in.';
@@ -992,7 +991,7 @@ if (isLoginPage && adminSetupForm) {
                 const err = await response.json().catch(() => ({}));
                 throw new Error(err.message || 'Setup failed');
             }
-            const data = await response.json();
+            await response.json();
 
             // Show success message in the GUI instead of alert
             const successMsg = window.i18n ? window.i18n.t('auth.admin_success') : 'Admin account created successfully! You can now log in.';
@@ -1048,7 +1047,7 @@ async function login(username, password) {
             try {
                 const errorData = await response.json();
                 throw new Error(errorData.error || 'Authentication failed');
-            } catch (jsonError) {
+            } catch (_jsonError) {
                 // If the error response is not valid JSON
                 throw new Error(`Authentication error (${response.status}): ${response.statusText}`);
             }
@@ -1092,7 +1091,7 @@ async function register(username, email, password, role = 'user') {
             try {
                 const errorData = await response.json();
                 throw new Error(errorData.error || 'Registration error');
-            } catch (jsonError) {
+            } catch (_jsonError) {
                 // If the error response is not valid JSON
                 throw new Error(`Registration error (${response.status}): ${response.statusText}`);
             }
@@ -1116,6 +1115,8 @@ async function register(username, email, password, role = 'user') {
 /**
  * Fetch current user data — relies on HttpOnly cookie (auto-sent).
  */
+
+// biome-ignore lint/correctness/noUnusedVariables: global function
 async function fetchUserData() {
     try {
         const response = await fetch(ME_ENDPOINT, {
@@ -1142,7 +1143,7 @@ async function fetchUserData() {
 async function refreshAuthToken() {
     try {
         // Loop-breaker
-        const refreshAttempts = parseInt(localStorage.getItem('refresh_attempts') || '0');
+        const refreshAttempts = parseInt(localStorage.getItem('refresh_attempts') || '0', 10);
         localStorage.setItem('refresh_attempts', (refreshAttempts + 1).toString());
 
         if (refreshAttempts > 3) {
@@ -1232,6 +1233,8 @@ function redirectToMainApp() {
 /**
  * Logout — tell the server to clear HttpOnly cookies, then redirect.
  */
+
+// biome-ignore lint/correctness/noUnusedVariables: global function
 async function logout() {
     try {
         await fetch('/api/auth/logout', {
diff --git a/static/js/features/files/contextMenus.js b/static/js/features/files/contextMenus.js
index 57743dfe..86cf4e00 100644
--- a/static/js/features/files/contextMenus.js
+++ b/static/js/features/files/contextMenus.js
@@ -25,9 +25,9 @@ const contextMenus = {
         const wopiEditTab = document.getElementById('wopi-edit-file-tab-option');
         if (!wopiEdit || !wopiEditTab) return;
 
-        const targetFile = window.app && window.app.contextMenuTargetFile;
+        const targetFile = window.app?.contextMenuTargetFile;
         // Don't show WOPI editor for image files - they should use inline preview
-        const isImage = targetFile && targetFile.mime_type && targetFile.mime_type.startsWith('image/');
+        const isImage = targetFile?.mime_type?.startsWith('image/');
         const show = targetFile && !isImage && window.wopiEditor && (await window.wopiEditor.canEdit(targetFile.name));
 
         wopiEdit.classList.toggle('hidden', !show);
@@ -37,8 +37,8 @@ const contextMenus = {
     syncFavoriteOptionLabels() {
         if (!window.favorites) return;
 
-        const targetFile = window.app && window.app.contextMenuTargetFile;
-        const targetFolder = window.app && window.app.contextMenuTargetFolder;
+        const targetFile = window.app?.contextMenuTargetFile;
+        const targetFolder = window.app?.contextMenuTargetFolder;
 
         if (targetFile) {
             const isFav = window.favorites.isFavorite(targetFile.id, 'file');
@@ -68,7 +68,7 @@ const contextMenus = {
                 const folder = window.app.contextMenuTargetFolder;
 
                 // Check if folder is already in favorites to toggle
-                if (window.favorites && window.favorites.isFavorite(folder.id, 'folder')) {
+                if (window.favorites?.isFavorite(folder.id, 'folder')) {
                     // Remove from favorites
                     const ok = await window.favorites.removeFromFavorites(folder.id, 'folder');
                     if (ok && window.ui && typeof window.ui.setFavoriteVisualState === 'function') {
@@ -127,7 +127,7 @@ const contextMenus = {
                     .then((response) => response.json())
                     .then((fileDetails) => {
                         // Check if viewable file type (images, PDFs, text files)
-                        if (window.ui && window.ui.isViewableFile(fileDetails)) {
+                        if (window.ui?.isViewableFile(fileDetails)) {
                             // Open with inline viewer
                             if (window.inlineViewer) {
                                 window.inlineViewer.openFile(fileDetails);
@@ -177,7 +177,7 @@ const contextMenus = {
                 const file = window.app.contextMenuTargetFile;
 
                 // Check if file is already in favorites to toggle
-                if (window.favorites && window.favorites.isFavorite(file.id, 'file')) {
+                if (window.favorites?.isFavorite(file.id, 'file')) {
                     // Remove from favorites
                     const ok = await window.favorites.removeFromFavorites(file.id, 'file');
                     if (ok && window.ui && typeof window.ui.setFavoriteVisualState === 'function') {
@@ -273,7 +273,7 @@ const contextMenus = {
                 const fileIds = items.filter((i) => i.type === 'file').map((i) => i.id);
                 const folderIds = items.filter((i) => i.type === 'folder').map((i) => i.id);
 
-                let result = await window.fileOps.batchCopy(fileIds, folderIds, targetId);
+                const result = await window.fileOps.batchCopy(fileIds, folderIds, targetId);
 
                 this.closeMoveDialog();
                 window.multiSelect.clear();
@@ -306,7 +306,7 @@ const contextMenus = {
                 const fileIds = items.filter((i) => i.type === 'file').map((i) => i.id);
                 const folderIds = items.filter((i) => i.type === 'folder' && i.id !== targetId).map((i) => i.id);
 
-                let result = await window.fileOps.batchMove(fileIds, folderIds, targetId);
+                const result = await window.fileOps.batchMove(fileIds, folderIds, targetId);
 
                 this.closeMoveDialog();
                 window.multiSelect.clear();
@@ -664,7 +664,7 @@ const contextMenus = {
             window.app.selectedTargetFolderId = parentFolderId || '';
 
             // Translate new elements
-            if (window.i18n && window.i18n.translateElement) {
+            if (window.i18n?.translateElement) {
                 window.i18n.translateElement(folderSelectContainer);
             }
         } catch (error) {
@@ -675,7 +675,7 @@ const contextMenus = {
     /**
      * Render breadcrumb navigation for move dialog
      */
-    _renderMoveDialogBreadcrumb(container, breadcrumb, currentFolderId) {
+    _renderMoveDialogBreadcrumb(container, breadcrumb, _currentFolderId) {
         if (!container) return;
         container.innerHTML = '';
 
@@ -757,6 +757,7 @@ const contextMenus = {
         // Use loadMoveDialogFolders which uses /api/folders/{id}/contents
         await this.loadMoveDialogFolders(window.app.userHomeFolderId || null);
     },
+
     /**
      * Show share dialog for files or folders
      * @param {Object} item - File or folder object
diff --git a/static/js/features/files/fileOperations.js b/static/js/features/files/fileOperations.js
index 4cd42fa3..c7aa9128 100644
--- a/static/js/features/files/fileOperations.js
+++ b/static/js/features/files/fileOperations.js
@@ -350,7 +350,7 @@ const fileOps = {
 
                 // Legacy dropzone bar
                 if (progressBar) {
-                    progressBar.style.width = (uploadedCount / totalFiles) * 100 + '%';
+                    progressBar.style.width = `${(uploadedCount / totalFiles) * 100}%`;
                 }
                 // Notify bell of per-file completion
                 if (window.notifications && batchId) {
@@ -601,7 +601,7 @@ const fileOps = {
 
                     result = await this._uploadFileFetch(formData, thisTimeout);
 
-                    console.log(`[UPLOAD END]   #${idx} ${rel} ok=${result.ok}${result.errorMsg ? ' err=' + result.errorMsg : ''}`);
+                    console.log(`[UPLOAD END]   #${idx} ${rel} ok=${result.ok}${result.errorMsg ? ` err=${result.errorMsg}` : ''}`);
                 } catch (e) {
                     result = {
                         ok: false,
@@ -618,7 +618,7 @@ const fileOps = {
                     } catch (_) {}
                 }
                 if (progressBar && uploadedCount % 10 === 0) {
-                    progressBar.style.width = (uploadedCount / totalFiles) * 100 + '%';
+                    progressBar.style.width = `${(uploadedCount / totalFiles) * 100}%`;
                 }
                 if (uploadedCount % 50 === 0 || uploadedCount === totalFiles) {
                     console.log(`Progress: ${uploadedCount}/${totalFiles} (${successCount} ok)`);
@@ -748,7 +748,7 @@ const fileOps = {
                 try {
                     const errorData = await response.json();
                     errorMessage = errorData.error || 'Unknown error';
-                } catch (e) {
+                } catch (_e) {
                     errorMessage = 'Error processing server response';
                 }
                 window.ui.showNotification('Error', `Error moving the file: ${errorMessage}`);
@@ -790,7 +790,7 @@ const fileOps = {
                 try {
                     const errorData = await response.json();
                     errorMessage = errorData.error || 'Unknown error';
-                } catch (e) {
+                } catch (_e) {
                     errorMessage = 'Error processing server response';
                 }
                 window.ui.showNotification('Error', `Error moving the folder: ${errorMessage}`);
@@ -808,7 +808,7 @@ const fileOps = {
     * @property {number} success number of files|folders sucessfully updated
     * @property {number} errors  number of files|folders in error
     * /
-    
+
     /**
      * Move files & folders
      * @param {string[]} fileIds - File IDs
@@ -883,7 +883,7 @@ const fileOps = {
             });
 
             if (response.ok) {
-                const result = await response.json();
+                await response.json();
                 // Reload files after copying
                 await window.loadFiles();
                 window.ui.showNotification('File copied', 'File copied successfully');
@@ -893,7 +893,7 @@ const fileOps = {
                 try {
                     const errorData = await response.json();
                     errorMessage = errorData.error || 'Unknown error';
-                } catch (e) {
+                } catch (_e) {
                     errorMessage = 'Error processing server response';
                 }
                 window.ui.showNotification('Error', `Error copying the file: ${errorMessage}`);
@@ -997,7 +997,7 @@ const fileOps = {
                 try {
                     const errorData = JSON.parse(errorText);
                     errorMessage = errorData.error || response.statusText;
-                } catch (e) {
+                } catch (_e) {
                     errorMessage = errorText || response.statusText;
                 }
                 window.ui.showNotification('Error', `Error renaming the file: ${errorMessage}`);
@@ -1043,7 +1043,7 @@ const fileOps = {
                     // Try to parse as JSON
                     const errorData = JSON.parse(errorText);
                     errorMessage = errorData.error || response.statusText;
-                } catch (e) {
+                } catch (_e) {
                     // If not JSON, use text as is
                     errorMessage = errorText || response.statusText;
                 }
diff --git a/static/js/features/files/inlineViewer.js b/static/js/features/files/inlineViewer.js
index a791022a..e1ce5fb8 100644
--- a/static/js/features/files/inlineViewer.js
+++ b/static/js/features/files/inlineViewer.js
@@ -96,7 +96,7 @@ class InlineViewer {
         // Detect images by mime type OR extension (uploads via WebDAV may lack correct mime)
         const ext = (file.name || '').split('.').pop().toLowerCase();
         const imageExts = ['jpg', 'jpeg', 'png', 'gif', 'svg', 'webp', 'bmp', 'ico', 'heic', 'heif', 'avif', 'tiff'];
-        const isImage = (file.mime_type && file.mime_type.startsWith('image/')) || imageExts.includes(ext);
+        const isImage = file.mime_type?.startsWith('image/') || imageExts.includes(ext);
         if (!isImage && window.wopiEditor && (await window.wopiEditor.canEdit(file.name))) {
             try {
                 window.wopiEditor.openInModal(file.id, file.name, 'edit');
@@ -159,7 +159,7 @@ class InlineViewer {
 
             // Create text viewer using authenticated fetch
             this.createTextViewer(file, container, loader);
-        } else if (file.mime_type && file.mime_type.startsWith('audio/')) {
+        } else if (file.mime_type?.startsWith('audio/')) {
             // Hide zoom controls for audio
             controls.style.display = 'none';
 
@@ -171,7 +171,7 @@ class InlineViewer {
 
             // Create audio player
             this.createMediaViewer(file, 'audio', container, loader);
-        } else if (file.mime_type && file.mime_type.startsWith('video/')) {
+        } else if (file.mime_type?.startsWith('video/')) {
             // Hide zoom controls for video
             controls.style.display = 'none';
 
@@ -225,7 +225,7 @@ class InlineViewer {
             const text = await response.text();
 
             // Remove loader
-            if (loader && loader.parentNode) {
+            if (loader?.parentNode) {
                 loader.parentNode.removeChild(loader);
             }
 
@@ -240,7 +240,7 @@ class InlineViewer {
             console.error('Error creating text viewer:', error);
 
             // Remove loader
-            if (loader && loader.parentNode) {
+            if (loader?.parentNode) {
                 loader.parentNode.removeChild(loader);
             }
 
@@ -284,8 +284,8 @@ class InlineViewer {
                     // e.loaded and e.total are JavaScript numbers (64-bit float)
                     const progress = e.loaded / e.total;
                     const pct = Math.round(progress * 100);
-                    progressBar.style.width = pct + '%';
-                    progressText.textContent = pct + '%';
+                    progressBar.style.width = `${pct}%`;
+                    progressText.textContent = `${pct}%`;
                 }
             };
 
@@ -299,7 +299,7 @@ class InlineViewer {
                     }
                 };
 
-                xhr.onerror = function () {
+                xhr.onerror = () => {
                     reject(new Error('Network error'));
                 };
 
@@ -310,10 +310,10 @@ class InlineViewer {
             const blob = response;
             const blobUrl = URL.createObjectURL(blob);
 
-            console.log('Created blob URL:', blobUrl.substring(0, 30) + '...');
+            console.log('Created blob URL:', `${blobUrl.substring(0, 30)}...`);
 
             // Remove loader
-            if (loader && loader.parentNode) {
+            if (loader?.parentNode) {
                 loader.parentNode.removeChild(loader);
             }
 
@@ -369,7 +369,7 @@ class InlineViewer {
             console.error('Error creating blob URL viewer:', error);
 
             // Remove loader
-            if (loader && loader.parentNode) {
+            if (loader?.parentNode) {
                 loader.parentNode.removeChild(loader);
             }
 
@@ -395,7 +395,7 @@ class InlineViewer {
             const blobUrl = URL.createObjectURL(blob);
 
             // Remove loader
-            if (loader && loader.parentNode) {
+            if (loader?.parentNode) {
                 loader.parentNode.removeChild(loader);
             }
 
@@ -472,7 +472,7 @@ class InlineViewer {
         } catch (error) {
             console.error(`Error creating ${mediaType} viewer:`, error);
 
-            if (loader && loader.parentNode) {
+            if (loader?.parentNode) {
                 loader.parentNode.removeChild(loader);
             }
 
@@ -492,85 +492,85 @@ class InlineViewer {
         <p>Try downloading it directly.</p>
       </div>
     `;
-    container.appendChild(message);
-  }
-  
-  closeViewer() {
-    // Get modal
-    const modal = document.getElementById('inline-viewer-modal');
-    
-    // stops audio/video before closing viewver
-    const media = modal.querySelector('audio, video');
-    if (media && !media.paused) media.pause();
-
-    // Hide modal
-    modal.classList.remove('active');
-    
-    // Clean up blob URL if exists
-    if (this.currentBlobUrl) {
-      URL.revokeObjectURL(this.currentBlobUrl);
-      this.currentBlobUrl = null;
+        container.appendChild(message);
     }
 
-    // clear
-    window.app.viewFile = null;
-    window.updateHistory(false);
+    closeViewer() {
+        // Get modal
+        const modal = document.getElementById('inline-viewer-modal');
 
-    // Clear references
-    this.currentFile = null;
-  }
-  
-  downloadFile(file) {
-    fetch(`/api/files/${file.id}`, { credentials: 'same-origin' })
-      .then(res => {
-        if (!res.ok) throw new Error(`HTTP ${res.status}`);
-        return res.blob();
-      })
-      .then(blob => {
-        const url = URL.createObjectURL(blob);
-        const link = document.createElement('a');
-        link.href = url;
-        link.download = file.name;
-        document.body.appendChild(link);
-        link.click();
-        document.body.removeChild(link);
-        URL.revokeObjectURL(url);
-      })
-      .catch(err => console.error('Download error:', err));
-  }
-  
-  zoomImage(factor) {
-    const container = document.querySelector('.inline-viewer-container');
-    const img = container.querySelector('.inline-viewer-image');
-    
-    if (!img) return;
-    
-    // Get current scale
-    let scale = img.dataset.scale ? parseFloat(img.dataset.scale) : 1.0;
-    
-    // Apply zoom factor
-    scale *= factor;
-    
-    // Limit scale
-    scale = Math.max(0.1, Math.min(5.0, scale));
-    
-    // Save scale
-    img.dataset.scale = scale;
-    
-    // Apply scale
-    img.style.transform = `scale(${scale})`;
-  }
-  
-  resetZoom() {
-    const container = document.querySelector('.inline-viewer-container');
-    const img = container.querySelector('.inline-viewer-image');
-    
-    if (!img) return;
-    
-    // Reset scale
-    img.dataset.scale = 1.0;
-    img.style.transform = 'scale(1.0)';
-  }
+        // stops audio/video before closing viewver
+        const media = modal.querySelector('audio, video');
+        if (media && !media.paused) media.pause();
+
+        // Hide modal
+        modal.classList.remove('active');
+
+        // Clean up blob URL if exists
+        if (this.currentBlobUrl) {
+            URL.revokeObjectURL(this.currentBlobUrl);
+            this.currentBlobUrl = null;
+        }
+
+        // clear
+        window.app.viewFile = null;
+        window.updateHistory(false);
+
+        // Clear references
+        this.currentFile = null;
+    }
+
+    downloadFile(file) {
+        fetch(`/api/files/${file.id}`, { credentials: 'same-origin' })
+            .then((res) => {
+                if (!res.ok) throw new Error(`HTTP ${res.status}`);
+                return res.blob();
+            })
+            .then((blob) => {
+                const url = URL.createObjectURL(blob);
+                const link = document.createElement('a');
+                link.href = url;
+                link.download = file.name;
+                document.body.appendChild(link);
+                link.click();
+                document.body.removeChild(link);
+                URL.revokeObjectURL(url);
+            })
+            .catch((err) => console.error('Download error:', err));
+    }
+
+    zoomImage(factor) {
+        const container = document.querySelector('.inline-viewer-container');
+        const img = container.querySelector('.inline-viewer-image');
+
+        if (!img) return;
+
+        // Get current scale
+        let scale = img.dataset.scale ? parseFloat(img.dataset.scale) : 1.0;
+
+        // Apply zoom factor
+        scale *= factor;
+
+        // Limit scale
+        scale = Math.max(0.1, Math.min(5.0, scale));
+
+        // Save scale
+        img.dataset.scale = scale;
+
+        // Apply scale
+        img.style.transform = `scale(${scale})`;
+    }
+
+    resetZoom() {
+        const container = document.querySelector('.inline-viewer-container');
+        const img = container.querySelector('.inline-viewer-image');
+
+        if (!img) return;
+
+        // Reset scale
+        img.dataset.scale = 1.0;
+        img.style.transform = 'scale(1.0)';
+    }
 }
 
 // Initialize viewer when document is ready
diff --git a/static/js/features/files/multiSelect.js b/static/js/features/files/multiSelect.js
index 54aa8ee5..5cae4d1d 100644
--- a/static/js/features/files/multiSelect.js
+++ b/static/js/features/files/multiSelect.js
@@ -72,8 +72,12 @@ const multiSelect = {
     clear() {
         this._selected.clear();
         this._lastClickedIndex = -1;
-        document.querySelectorAll('.file-item.selected').forEach((el) => el.classList.remove('selected'));
-        document.querySelectorAll('.item-checkbox').forEach((cb) => (cb.checked = false));
+        document.querySelectorAll('.file-item.selected').forEach((el) => {
+            el.classList.remove('selected');
+        });
+        document.querySelectorAll('.item-checkbox').forEach((cb) => {
+            cb.checked = false;
+        });
         this._syncUI();
     },
 
@@ -103,8 +107,8 @@ const multiSelect = {
      * @return {ItemSelection}
      */
     getSelection(targtFolderId) {
-        let fileIds = [];
-        let folderIds = [];
+        const fileIds = [];
+        const folderIds = [];
 
         // TODO optimize & check if _selected is a better use
         document.querySelectorAll(`div.file-item.selected`).forEach((item) => {
@@ -155,7 +159,9 @@ const multiSelect = {
     _selectAllInContainer(containerId, selector) {
         const container = document.getElementById(containerId);
         if (!container) return;
-        container.querySelectorAll(selector).forEach((el) => this._selectElement(el));
+        container.querySelectorAll(selector).forEach((el) => {
+            this._selectElement(el);
+        });
     },
 
     _getAllVisibleItems() {
@@ -190,7 +196,7 @@ const multiSelect = {
         const info = this._extractInfo(el);
         if (!info) return;
 
-        if (event && event.shiftKey && this._lastClickedIndex >= 0 && index >= 0) {
+        if (event?.shiftKey && this._lastClickedIndex >= 0 && index >= 0) {
             const start = Math.min(this._lastClickedIndex, index);
             const end = Math.max(this._lastClickedIndex, index);
             for (let i = start; i <= end; i++) {
@@ -200,7 +206,7 @@ const multiSelect = {
                     const sel = iInfo.type === 'folder' ? `[data-folder-id="${iInfo.id}"]` : `[data-file-id="${iInfo.id}"]`;
                     document.querySelectorAll(sel).forEach((e) => {
                         e.classList.add('selected');
-                        let checkbox = e.querySelector('input[type="checkbox"]');
+                        const checkbox = e.querySelector('input[type="checkbox"]');
                         if (checkbox) checkbox.checked = true;
                     });
                 }
@@ -208,7 +214,7 @@ const multiSelect = {
         } else {
             const nowSelected = this.toggle(info.id, info.name, info.type, info.parentId);
             el.classList.toggle('selected', nowSelected);
-            let checkbox = el.querySelector('input[type="checkbox"]');
+            const checkbox = el.querySelector('input[type="checkbox"]');
             if (checkbox) checkbox.checked = nowSelected;
         }
         this._lastClickedIndex = index;
@@ -504,7 +510,7 @@ const multiSelect = {
         const batchSelectionBar = document.getElementById('batch-selection-bar');
         batchSelectionBar.innerHTML = this._buildSelectionBarHTML();
 
-        if (window.i18n && window.i18n.translateElement) {
+        if (window.i18n?.translateElement) {
             window.i18n.translateElement(batchSelectionBar);
         }
         this._wireBarButtons();
@@ -512,10 +518,9 @@ const multiSelect = {
 
     // FIXME: competition with _
     _injectListHeaderCheckbox() {
-        const self = this;
         const selectAllCheckbox = document.getElementById('select-all-checkbox');
         if (!selectAllCheckbox) return;
-        selectAllCheckbox.addEventListener('change', () => self.toggleAll());
+        selectAllCheckbox.addEventListener('change', () => this.toggleAll());
     }
 };
 
diff --git a/static/js/features/files/search.js b/static/js/features/files/search.js
index 8d27106b..46dfc78e 100644
--- a/static/js/features/files/search.js
+++ b/static/js/features/files/search.js
@@ -47,7 +47,7 @@ const search = {
                 try {
                     const errorJson = await response.json();
                     errorText = errorJson.error || response.statusText;
-                } catch (e) {
+                } catch (_e) {
                     errorText = response.statusText;
                 }
                 console.error(`Search error: ${errorText}`);
@@ -142,7 +142,7 @@ const search = {
         if (sortSelect) {
             sortSelect.addEventListener('change', () => {
                 const searchInput = document.querySelector('.search-container input');
-                if (searchInput && searchInput.value.trim()) {
+                if (searchInput?.value.trim()) {
                     const event = new CustomEvent('search-resort', {
                         detail: { sort_by: sortSelect.value }
                     });
diff --git a/static/js/features/files/wopiEditor.js b/static/js/features/files/wopiEditor.js
index a3a36717..435f4001 100644
--- a/static/js/features/files/wopiEditor.js
+++ b/static/js/features/files/wopiEditor.js
@@ -17,8 +17,8 @@ class WopiEditor {
      * Fetches supported extensions from the server (cached after first call).
      */
     async canEdit(filename) {
-        var ext = filename.split('.').pop().toLowerCase();
-        var supported = await this._getSupportedExtensions();
+        const ext = filename.split('.').pop().toLowerCase();
+        const supported = await this._getSupportedExtensions();
         return supported.includes(ext);
     }
 
@@ -38,8 +38,8 @@ class WopiEditor {
     async openInTab(fileId, fileName, action) {
         action = action || 'edit';
         try {
-            var data = await this._getEditorUrlWithFallback(fileId, fileName, action);
-            var hostUrl = '/wopi/edit/' + encodeURIComponent(fileId) + '?access_token=' + encodeURIComponent(data.access_token);
+            const data = await this._getEditorUrlWithFallback(fileId, fileName, action);
+            const hostUrl = `/wopi/edit/${encodeURIComponent(fileId)}?access_token=${encodeURIComponent(data.access_token)}`;
             window.open(hostUrl, '_blank');
         } catch (error) {
             console.error('Failed to open WOPI editor in tab:', error);
@@ -53,12 +53,12 @@ class WopiEditor {
      * Fetch editor URL and WOPI token from the backend.
      */
     async _getEditorUrl(fileId, action) {
-        var response = await fetch('/api/wopi/editor-url?file_id=' + encodeURIComponent(fileId) + '&action=' + encodeURIComponent(action), {
+        const response = await fetch(`/api/wopi/editor-url?file_id=${encodeURIComponent(fileId)}&action=${encodeURIComponent(action)}`, {
             credentials: 'same-origin'
         });
         if (!response.ok) {
-            var text = await response.text();
-            throw new Error('Editor URL request failed: ' + response.status + ' ' + text);
+            const text = await response.text();
+            throw new Error(`Editor URL request failed: ${response.status} ${text}`);
         }
         return response.json();
     }
@@ -94,55 +94,55 @@ class WopiEditor {
     _showModal(editorData, fileName) {
         this.closeEditor();
 
-        var modal = document.createElement('div');
+        const modal = document.createElement('div');
         modal.id = 'wopi-editor-modal';
         modal.style.cssText = 'position:fixed;top:0;left:0;width:100%;height:100%;z-index:10000;background:#fff;';
 
-        var header = document.createElement('div');
+        const header = document.createElement('div');
         header.style.cssText =
             'height:40px;background:#333;color:#fff;display:flex;align-items:center;justify-content:space-between;padding:0 16px;font-family:sans-serif;font-size:14px;';
 
-        var title = document.createElement('span');
+        const title = document.createElement('span');
         title.textContent = fileName;
         header.appendChild(title);
 
-        var closeBtn = document.createElement('button');
+        const closeBtn = document.createElement('button');
         closeBtn.textContent = '\u2715';
         closeBtn.style.cssText = 'background:none;border:none;color:#fff;cursor:pointer;font-size:18px;padding:4px 8px;';
         closeBtn.onclick = this.closeEditor.bind(this);
         header.appendChild(closeBtn);
 
-        var form = document.createElement('form');
+        const form = document.createElement('form');
         form.id = 'wopi_form';
         form.target = 'wopi_frame';
         form.action = editorData.editor_url;
         form.method = 'post';
         form.style.display = 'none';
 
-        var tokenInput = document.createElement('input');
+        const tokenInput = document.createElement('input');
         tokenInput.name = 'access_token';
         tokenInput.value = editorData.access_token;
         tokenInput.type = 'hidden';
         form.appendChild(tokenInput);
 
-        var ttlInput = document.createElement('input');
+        const ttlInput = document.createElement('input');
         ttlInput.name = 'access_token_ttl';
         ttlInput.value = editorData.access_token_ttl;
         ttlInput.type = 'hidden';
         form.appendChild(ttlInput);
 
-        var frameHolder = document.createElement('div');
+        const frameHolder = document.createElement('div');
         frameHolder.style.cssText = 'position:absolute;top:40px;left:0;right:0;bottom:0;';
 
         // Loading spinner (removed once the editor signals ready)
-        var spinner = document.createElement('div');
+        const spinner = document.createElement('div');
         spinner.id = 'wopi-loading-spinner';
         spinner.style.cssText =
             'position:absolute;top:0;left:0;right:0;bottom:0;display:flex;align-items:center;justify-content:center;background:#f5f5f5;z-index:1;';
         spinner.innerHTML = '<i class="fas fa-spinner fa-spin empty-state-icon spinner"></i>';
         frameHolder.appendChild(spinner);
 
-        var iframe = document.createElement('iframe');
+        const iframe = document.createElement('iframe');
         iframe.name = 'wopi_frame';
         iframe.title = 'Document Editor';
         iframe.style.cssText = 'width:100%;height:100%;border:none;';
@@ -175,9 +175,9 @@ class WopiEditor {
             if (msgId === 'UI_Close' || msgId === 'close') {
                 this.closeEditor();
             } else if (msgId === 'App_LoadingStatus') {
-                var status = data.Values && data.Values.Status;
+                const status = data.Values?.Status;
                 if (status === 'Document_Loaded' || status === 'Frame_Ready') {
-                    var sp = document.getElementById('wopi-loading-spinner');
+                    const sp = document.getElementById('wopi-loading-spinner');
                     if (sp) sp.remove();
                 }
             }
@@ -225,9 +225,9 @@ class WopiEditor {
      */
     async _fetchSupportedExtensions() {
         try {
-            var response = await fetch('/wopi/supported-extensions');
+            const response = await fetch('/wopi/supported-extensions');
             if (response.ok) {
-                var exts = await response.json();
+                const exts = await response.json();
                 if (Array.isArray(exts) && exts.length > 0) {
                     this._supportedExtensions = exts;
                     return exts;
diff --git a/static/js/features/library/favorites.js b/static/js/features/library/favorites.js
index 3d9dc7e9..91e24eb8 100644
--- a/static/js/features/library/favorites.js
+++ b/static/js/features/library/favorites.js
@@ -104,7 +104,7 @@ const favorites = {
             await this._fetchFromServer();
 
             // Notify user
-            if (window.ui && window.ui.showNotification) {
+            if (window.ui?.showNotification) {
                 window.ui.showNotification(
                     window.i18n ? window.i18n.t('favorites.added_title') : 'Added to favorites',
                     `"${name}" ${window.i18n ? window.i18n.t('favorites.added_msg') : 'added to favorites'}`
@@ -139,7 +139,7 @@ const favorites = {
             // Remove from local cache
             this._cache.delete(this._cacheKey(id, type));
 
-            if (window.ui && window.ui.showNotification) {
+            if (window.ui?.showNotification) {
                 window.ui.showNotification(
                     window.i18n ? window.i18n.t('favorites.removed_title') : 'Removed from favorites',
                     `"${itemName}" ${window.i18n ? window.i18n.t('favorites.removed_msg') : 'removed from favorites'}`
@@ -208,7 +208,7 @@ const favorites = {
             if (files.length) window.ui.renderFiles(files);
         } catch (error) {
             console.error('Error displaying favorites:', error);
-            if (window.ui && window.ui.showNotification) {
+            if (window.ui?.showNotification) {
                 window.ui.showNotification('Error', 'Error loading favorite items');
             }
         }
diff --git a/static/js/features/library/photos.js b/static/js/features/library/photos.js
index ad9ae7e0..410b2920 100644
--- a/static/js/features/library/photos.js
+++ b/static/js/features/library/photos.js
@@ -207,7 +207,7 @@ const photosView = {
             if (existingHeader) {
                 // Append tiles to existing grid and update count badge
                 const grid = existingHeader.nextElementSibling;
-                if (grid && grid.classList.contains('photos-grid')) {
+                if (grid?.classList.contains('photos-grid')) {
                     grid.insertAdjacentHTML('beforeend', tilesHtml);
                     const countSpan = existingHeader.querySelector('.photos-day-count');
                     if (countSpan) countSpan.textContent = grid.children.length;
@@ -228,7 +228,7 @@ const photosView = {
 
     /** Generate HTML for a single photo/video tile */
     _renderTile(file) {
-        const isVideo = file.mime_type && file.mime_type.startsWith('video/');
+        const isVideo = file.mime_type?.startsWith('video/');
         const selected = this.selected.has(file.id) ? ' selected' : '';
         const cachedThumb = isVideo && this._videoThumbCache.has(file.id) ? this._videoThumbCache.get(file.id) : null;
         const thumbUrl = cachedThumb || `/api/files/${file.id}/thumbnail/preview`;
@@ -359,7 +359,7 @@ const photosView = {
                         // Upload to server for permanent caching
                         const token = localStorage.getItem('token') || sessionStorage.getItem('token');
                         const headers = { 'Content-Type': blob.type, ...getCsrfHeaders() };
-                        if (token) headers['Authorization'] = `Bearer ${token}`;
+                        if (token) headers.Authorization = `Bearer ${token}`;
 
                         fetch(`/api/files/${fileId}/thumbnail/preview`, {
                             method: 'PUT',
@@ -527,7 +527,9 @@ const photosView = {
 
         bar.querySelector('#photos-sel-clear').onclick = () => {
             this.selected.clear();
-            this._container.querySelectorAll('.photo-tile.selected').forEach((t) => t.classList.remove('selected'));
+            this._container.querySelectorAll('.photo-tile.selected').forEach((t) => {
+                t.classList.remove('selected');
+            });
             this._hideSelectionBar();
         };
 
diff --git a/static/js/features/library/photosLightbox.js b/static/js/features/library/photosLightbox.js
index 23ce828f..bb661ca1 100644
--- a/static/js/features/library/photosLightbox.js
+++ b/static/js/features/library/photosLightbox.js
@@ -139,7 +139,7 @@ const photosLightbox = {
         content.innerHTML = '<div class="photos-loading"><i class="fas fa-spinner"></i></div>';
 
         try {
-            const isVideo = item.mime_type && item.mime_type.startsWith('video/');
+            const isVideo = item.mime_type?.startsWith('video/');
             const res = await fetch(`/api/files/${item.id}`, {
                 credentials: 'include',
                 headers: this._headers()
@@ -172,7 +172,7 @@ const photosLightbox = {
             });
             if (res.ok) {
                 const data = await res.json();
-                let parts = [dateStr];
+                const parts = [dateStr];
                 if (sizeStr) parts.push(sizeStr);
                 if (data.camera_make || data.camera_model) {
                     parts.push([data.camera_make, data.camera_model].filter(Boolean).join(' '));
@@ -182,7 +182,7 @@ const photosLightbox = {
                 }
                 metaEl.textContent = parts.join(' · ');
             }
-        } catch (err) {
+        } catch (_err) {
             // Non-critical, keep existing meta
         }
     },
diff --git a/static/js/features/library/recent.js b/static/js/features/library/recent.js
index 78bf32e3..129284b4 100644
--- a/static/js/features/library/recent.js
+++ b/static/js/features/library/recent.js
@@ -32,7 +32,7 @@ const recent = {
      */
     setupEventListeners() {
         document.addEventListener('file-accessed', (event) => {
-            if (event.detail && event.detail.file) {
+            if (event.detail?.file) {
                 const file = event.detail.file;
                 const itemType = file.item_type || 'file';
                 this._recordAccess(file.id, itemType);
@@ -144,7 +144,7 @@ const recent = {
             if (files.length) window.ui.renderFiles(files);
         } catch (error) {
             console.error('Error displaying recent files:', error);
-            if (window.ui && window.ui.showNotification) {
+            if (window.ui?.showNotification) {
                 window.ui.showNotification('Error', 'Error loading recent files');
             }
         }
diff --git a/static/js/views/admin/admin.js b/static/js/views/admin/admin.js
index 6212a40e..c8478428 100644
--- a/static/js/views/admin/admin.js
+++ b/static/js/views/admin/admin.js
@@ -14,8 +14,8 @@ function t(key, params) {
 /** Escape a string for safe embedding inside a JS string literal within an HTML attribute. */
 function _escJs(s) {
     if (typeof s !== 'string') return '';
-    return s.replace(/[^\w .\-]/g, function (c) {
-        return '\\x' + c.charCodeAt(0).toString(16).padStart(2, '0');
+    return s.replace(/[^\w .-]/g, (c) => {
+        return `\\x${c.charCodeAt(0).toString(16).padStart(2, '0')}`;
     });
 }
 
@@ -46,7 +46,7 @@ function formatBytes(bytes) {
     const k = 1024,
         sizes = ['B', 'KB', 'MB', 'GB', 'TB'];
     const i = Math.floor(Math.log(bytes) / Math.log(k));
-    return parseFloat((bytes / Math.pow(k, i)).toFixed(1)) + ' ' + sizes[i];
+    return `${parseFloat((bytes / k ** i).toFixed(1))} ${sizes[i]}`;
 }
 
 function timeAgo(dateStr) {
@@ -63,11 +63,11 @@ function timeAgo(dateStr) {
 
 /* ── Custom confirm modal ── */
 function showConfirm(message) {
-    return new Promise(function (resolve) {
-        var overlay = document.getElementById('confirm-modal');
-        var msgEl = document.getElementById('confirm-message');
-        var yesBtn = document.getElementById('confirm-yes');
-        var noBtn = document.getElementById('confirm-cancel');
+    return new Promise((resolve) => {
+        const overlay = document.getElementById('confirm-modal');
+        const msgEl = document.getElementById('confirm-message');
+        const yesBtn = document.getElementById('confirm-yes');
+        const noBtn = document.getElementById('confirm-cancel');
         msgEl.textContent = message;
         overlay.classList.remove('hidden');
         overlay.classList.add('show-flex');
@@ -100,10 +100,10 @@ let activeTabName = 'dashboard';
 
 function switchTab(name, el) {
     if (name === activeTabName) return;
-    var oldTab = document.getElementById('tab-' + activeTabName);
-    var newTab = document.getElementById('tab-' + name);
+    var oldTab = document.getElementById(`tab-${activeTabName}`);
+    var newTab = document.getElementById(`tab-${name}`);
 
-    document.querySelectorAll('.admin-tab').forEach(function (b) {
+    document.querySelectorAll('.admin-tab').forEach((b) => {
         b.classList.remove('active');
     });
     if (el) el.classList.add('active');
@@ -138,7 +138,7 @@ function switchTab(name, el) {
 
 async function loadDashboard() {
     try {
-        const resp = await fetch(API + '/admin/dashboard', {
+        const resp = await fetch(`${API}/admin/dashboard`, {
             headers: headers(),
             credentials: 'same-origin'
         });
@@ -147,13 +147,13 @@ async function loadDashboard() {
         document.getElementById('ds-total-users').textContent = d.total_users;
         document.getElementById('ds-active-users').textContent = d.active_users;
         document.getElementById('ds-admin-users').textContent = d.admin_users;
-        document.getElementById('ds-version').textContent = 'v' + d.server_version;
+        document.getElementById('ds-version').textContent = `v${d.server_version}`;
         document.getElementById('ds-used').textContent = formatBytes(d.total_used_bytes);
         document.getElementById('ds-quota').textContent = formatBytes(d.total_quota_bytes);
-        document.getElementById('ds-usage-pct').textContent = d.storage_usage_percent.toFixed(1) + '%';
+        document.getElementById('ds-usage-pct').textContent = `${d.storage_usage_percent.toFixed(1)}%`;
         const bar = document.getElementById('ds-bar');
-        bar.style.width = Math.min(d.storage_usage_percent, 100) + '%';
-        bar.className = 'progress-fill ' + (d.storage_usage_percent > 90 ? 'red' : d.storage_usage_percent > 70 ? 'orange' : 'green');
+        bar.style.width = `${Math.min(d.storage_usage_percent, 100)}%`;
+        bar.className = `progress-fill ${d.storage_usage_percent > 90 ? 'red' : d.storage_usage_percent > 70 ? 'orange' : 'green'}`;
         document.getElementById('ds-auth').textContent = d.auth_enabled ? t('admin.enabled') : t('admin.disabled');
         document.getElementById('ds-oidc').textContent = d.oidc_configured ? t('admin.active') : t('admin.off');
         document.getElementById('ds-quotas-flag').textContent = d.quotas_enabled ? t('admin.enabled') : t('admin.disabled');
@@ -179,10 +179,9 @@ async function loadDashboard() {
 
 async function loadUsers() {
     const tbody = document.getElementById('users-tbody');
-    tbody.innerHTML =
-        '<tr><td colspan="7" class="table-loading-cell"><i class="fas fa-spinner fa-spin"></i> ' + escapeHtml(t('admin.loading_users')) + '</td></tr>';
+    tbody.innerHTML = `<tr><td colspan="7" class="table-loading-cell"><i class="fas fa-spinner fa-spin"></i> ${escapeHtml(t('admin.loading_users'))}</td></tr>`;
     try {
-        const resp = await fetch(API + '/admin/users?limit=' + PAGE_SIZE + '&offset=' + usersPage * PAGE_SIZE, {
+        const resp = await fetch(`${API}/admin/users?limit=${PAGE_SIZE}&offset=${usersPage * PAGE_SIZE}`, {
             headers: headers(),
             credentials: 'same-origin'
         });
@@ -197,7 +196,7 @@ async function loadUsers() {
         totalUsers = data.total;
         const users = data.users;
         if (users.length === 0) {
-            tbody.innerHTML = '<tr><td colspan="7" class="table-status-empty">' + escapeHtml(t('admin.no_users_found')) + '</td></tr>';
+            tbody.innerHTML = `<tr><td colspan="7" class="table-status-empty">${escapeHtml(t('admin.no_users_found'))}</td></tr>`;
             return;
         }
 
@@ -207,8 +206,8 @@ async function loadUsers() {
                 const quotaColor = quotaPct > 90 ? 'red' : quotaPct > 70 ? 'orange' : 'green';
                 const quotaText =
                     u.storage_quota_bytes > 0
-                        ? formatBytes(u.storage_used_bytes) + ' / ' + formatBytes(u.storage_quota_bytes)
-                        : formatBytes(u.storage_used_bytes) + ' / ∞';
+                        ? `${formatBytes(u.storage_used_bytes)} / ${formatBytes(u.storage_quota_bytes)}`
+                        : `${formatBytes(u.storage_used_bytes)} / ∞`;
                 const isSelf = u.id === currentAdminId;
                 const isOidc = u.auth_provider && u.auth_provider !== 'local';
                 const authBadge = isOidc
@@ -217,12 +216,12 @@ async function loadUsers() {
                       '"><i class="fas fa-key badge-admin-icon-small"></i> ' +
                       escapeHtml(u.auth_provider) +
                       '</span>'
-                    : '<span class="badge badge-local">' + escapeHtml(t('admin.local')) + '</span>';
+                    : `<span class="badge badge-local">${escapeHtml(t('admin.local'))}</span>`;
                 return (
                     '<tr>' +
                     '<td><div class="user-info"><span class="user-name">' +
                     escapeHtml(u.username) +
-                    (isSelf ? ' <span class="user-self-badge">' + escapeHtml(t('admin.you_badge')) + '</span>' : '') +
+                    (isSelf ? ` <span class="user-self-badge">${escapeHtml(t('admin.you_badge'))}</span>` : '') +
                     '</span><span class="user-email">' +
                     escapeHtml(u.email) +
                     '</span></div></td>' +
@@ -308,15 +307,15 @@ async function loadUsers() {
             .join('');
 
         // Set dynamic progress bar widths (CSP-safe via JS property)
-        document.querySelectorAll('.progress-fill[data-width]').forEach(function (el) {
-            el.style.width = el.dataset.width + '%';
+        document.querySelectorAll('.progress-fill[data-width]').forEach((el) => {
+            el.style.width = `${el.dataset.width}%`;
             el.removeAttribute('data-width');
         });
 
         // Wire up admin action buttons (replaces inline onclick handlers)
-        document.querySelectorAll('.admin-action-btn').forEach(function (btn) {
-            btn.addEventListener('click', function () {
-                var action = btn.dataset.action;
+        document.querySelectorAll('.admin-action-btn').forEach((btn) => {
+            btn.addEventListener('click', () => {
+                const action = btn.dataset.action;
                 if (action === 'quota') openQuotaModal(btn.dataset.uid, btn.dataset.uname, Number(btn.dataset.quota));
                 else if (action === 'reset-pw') openResetPasswordModal(btn.dataset.uid, btn.dataset.uname);
                 else if (action === 'toggle-role') toggleRole(btn.dataset.uid, btn.dataset.role);
@@ -356,7 +355,7 @@ async function toggleRole(userId, currentRole) {
     const ok = await showConfirm(t('admin.confirm_role_change', { role: newRole }));
     if (!ok) return;
     try {
-        const resp = await fetch(API + '/admin/users/' + userId + '/role', {
+        const resp = await fetch(`${API}/admin/users/${userId}/role`, {
             method: 'PUT',
             headers: headers(),
             credentials: 'same-origin',
@@ -377,7 +376,7 @@ async function toggleActive(userId, currentActive) {
     const ok = await showConfirm(msg);
     if (!ok) return;
     try {
-        const resp = await fetch(API + '/admin/users/' + userId + '/active', {
+        const resp = await fetch(`${API}/admin/users/${userId}/active`, {
             method: 'PUT',
             headers: headers(),
             credentials: 'same-origin',
@@ -397,7 +396,7 @@ async function deleteUser(userId, username) {
     const ok = await showConfirm(t('admin.confirm_delete_user', { name: username }));
     if (!ok) return;
     try {
-        const resp = await fetch(API + '/admin/users/' + userId, {
+        const resp = await fetch(`${API}/admin/users/${userId}`, {
             method: 'DELETE',
             headers: headers(),
             credentials: 'same-origin'
@@ -429,10 +428,10 @@ function closeQuotaModal() {
 
 async function saveQuota() {
     const val = parseFloat(document.getElementById('qm-value').value) || 0;
-    const unit = parseInt(document.getElementById('qm-unit').value);
+    const unit = parseInt(document.getElementById('qm-unit').value, 10);
     const bytes = Math.round(val * unit);
     try {
-        const resp = await fetch(API + '/admin/users/' + quotaUserId + '/quota', {
+        const resp = await fetch(`${API}/admin/users/${quotaUserId}/quota`, {
             method: 'PUT',
             headers: headers(),
             credentials: 'same-origin',
@@ -473,7 +472,7 @@ async function submitCreateUser() {
     const email = document.getElementById('cu-email').value.trim() || null;
     const role = document.getElementById('cu-role').value;
     const quotaVal = parseFloat(document.getElementById('cu-quota-value').value) || 0;
-    const quotaUnit = parseInt(document.getElementById('cu-quota-unit').value);
+    const quotaUnit = parseInt(document.getElementById('cu-quota-unit').value, 10);
     const quotaBytes = Math.round(quotaVal * quotaUnit);
 
     const errorEl = document.getElementById('cu-error');
@@ -490,9 +489,9 @@ async function submitCreateUser() {
 
     const btn = document.getElementById('cu-submit');
     btn.disabled = true;
-    btn.innerHTML = '<i class="fas fa-spinner fa-spin"></i> ' + escapeHtml(t('admin.creating'));
+    btn.innerHTML = `<i class="fas fa-spinner fa-spin"></i> ${escapeHtml(t('admin.creating'))}`;
     try {
-        const resp = await fetch(API + '/admin/users', {
+        const resp = await fetch(`${API}/admin/users`, {
             method: 'POST',
             headers: headers(),
             credentials: 'same-origin',
@@ -518,7 +517,7 @@ async function submitCreateUser() {
         errorEl.className = 'alert alert-error';
     }
     btn.disabled = false;
-    btn.innerHTML = '<i class="fas fa-user-plus"></i> ' + escapeHtml(t('admin.create_user'));
+    btn.innerHTML = `<i class="fas fa-user-plus"></i> ${escapeHtml(t('admin.create_user'))}`;
 }
 
 let resetPwUserId = '';
@@ -546,9 +545,9 @@ async function submitResetPassword() {
 
     const btn = document.getElementById('rp-submit');
     btn.disabled = true;
-    btn.innerHTML = '<i class="fas fa-spinner fa-spin"></i> ' + escapeHtml(t('admin.resetting'));
+    btn.innerHTML = `<i class="fas fa-spinner fa-spin"></i> ${escapeHtml(t('admin.resetting'))}`;
     try {
-        const resp = await fetch(API + '/admin/users/' + resetPwUserId + '/password', {
+        const resp = await fetch(`${API}/admin/users/${resetPwUserId}/password`, {
             method: 'PUT',
             headers: headers(),
             credentials: 'same-origin',
@@ -566,14 +565,14 @@ async function submitResetPassword() {
         errorEl.className = 'alert alert-error';
     }
     btn.disabled = false;
-    btn.innerHTML = '<i class="fas fa-save"></i> ' + escapeHtml(t('admin.reset_btn'));
+    btn.innerHTML = `<i class="fas fa-save"></i> ${escapeHtml(t('admin.reset_btn'))}`;
 }
 
 async function toggleRegistration(enabled) {
     if (enabled) hideElement('registration-warning');
     else showElement('registration-warning', 'flex');
     try {
-        const resp = await fetch(API + '/admin/settings/registration', {
+        const resp = await fetch(`${API}/admin/settings/registration`, {
             method: 'PUT',
             headers: headers(),
             credentials: 'same-origin',
@@ -606,7 +605,7 @@ document.getElementById('disable-password').addEventListener('change', function
 function showOidcStatus(msg, type) {
     const el = document.getElementById('oidc-status');
     el.textContent = msg;
-    el.className = 'alert alert-' + type;
+    el.className = `alert alert-${type}`;
 }
 
 function copyCallback() {
@@ -622,10 +621,10 @@ async function testConnection() {
     }
     const btn = document.getElementById('discover-btn');
     btn.disabled = true;
-    btn.innerHTML = '<i class="fas fa-spinner fa-spin"></i> ' + escapeHtml(t('admin.discovering'));
+    btn.innerHTML = `<i class="fas fa-spinner fa-spin"></i> ${escapeHtml(t('admin.discovering'))}`;
     const resultDiv = document.getElementById('discovery-result');
     try {
-        const resp = await fetch(API + '/admin/settings/oidc/test', {
+        const resp = await fetch(`${API}/admin/settings/oidc/test`, {
             method: 'POST',
             headers: headers(),
             credentials: 'same-origin',
@@ -644,19 +643,19 @@ async function testConnection() {
             if (!document.getElementById('provider-name').value && r.provider_name_suggestion)
                 document.getElementById('provider-name').value = r.provider_name_suggestion;
         } else {
-            resultDiv.innerHTML = '<div class="discovery-result fail"><strong><i class="fas fa-times-circle"></i> ' + escapeHtml(r.message) + '</strong></div>';
+            resultDiv.innerHTML = `<div class="discovery-result fail"><strong><i class="fas fa-times-circle"></i> ${escapeHtml(r.message)}</strong></div>`;
         }
     } catch (e) {
-        resultDiv.innerHTML = '<div class="discovery-result fail"><i class="fas fa-times-circle"></i> Error: ' + escapeHtml(e.message) + '</div>';
+        resultDiv.innerHTML = `<div class="discovery-result fail"><i class="fas fa-times-circle"></i> Error: ${escapeHtml(e.message)}</div>`;
     }
     btn.disabled = false;
-    btn.innerHTML = '<i class="fas fa-search"></i> ' + escapeHtml(t('admin.auto_discover'));
+    btn.innerHTML = `<i class="fas fa-search"></i> ${escapeHtml(t('admin.auto_discover'))}`;
 }
 
 async function saveOidcSettings() {
     const btn = document.getElementById('save-btn');
     btn.disabled = true;
-    btn.innerHTML = '<i class="fas fa-spinner fa-spin"></i> ' + escapeHtml(t('admin.saving'));
+    btn.innerHTML = `<i class="fas fa-spinner fa-spin"></i> ${escapeHtml(t('admin.saving'))}`;
     const body = {
         enabled: document.getElementById('oidc-enabled').checked,
         issuer_url: document.getElementById('issuer-url').value.trim(),
@@ -669,7 +668,7 @@ async function saveOidcSettings() {
         provider_name: document.getElementById('provider-name').value.trim() || null
     };
     try {
-        const resp = await fetch(API + '/admin/settings/oidc', {
+        const resp = await fetch(`${API}/admin/settings/oidc`, {
             method: 'PUT',
             headers: headers(),
             credentials: 'same-origin',
@@ -681,18 +680,18 @@ async function saveOidcSettings() {
             loadDashboard();
         } else {
             const e = await resp.json().catch(() => ({}));
-            showOidcStatus('Error: ' + (e.message || resp.statusText), 'error');
+            showOidcStatus(`Error: ${e.message || resp.statusText}`, 'error');
         }
     } catch (e) {
         showOidcStatus(t('admin.error_network', { message: e.message }), 'error');
     }
     btn.disabled = false;
-    btn.innerHTML = '<i class="fas fa-save"></i> ' + escapeHtml(t('admin.save_btn'));
+    btn.innerHTML = `<i class="fas fa-save"></i> ${escapeHtml(t('admin.save_btn'))}`;
 }
 
 async function init() {
     try {
-        const me = await fetch(API + '/auth/me', {
+        const me = await fetch(`${API}/auth/me`, {
             headers: headers(),
             credentials: 'same-origin'
         });
@@ -707,7 +706,7 @@ async function init() {
         }
         currentAdminId = user.id;
 
-        const oidcResp = await fetch(API + '/admin/settings/oidc', {
+        const oidcResp = await fetch(`${API}/admin/settings/oidc`, {
             headers: headers(),
             credentials: 'same-origin'
         });
@@ -728,7 +727,7 @@ async function init() {
             document.getElementById('callback-url').textContent = s.callback_url;
             if (s.client_secret_set) showElement('secret-hint');
             (s.env_overrides || []).forEach((field) => {
-                const badge = document.getElementById('badge-' + field);
+                const badge = document.getElementById(`badge-${field}`);
                 if (badge) badge.innerHTML = '<span class="badge badge-env">ENV</span>';
             });
         }
@@ -748,14 +747,14 @@ function showAccessDenied() {
 }
 
 /* ── Apply i18n when translations load / change ── */
-document.addEventListener('translationsLoaded', function () {
-    if (window.i18n && window.i18n.translatePage) window.i18n.translatePage();
+document.addEventListener('translationsLoaded', () => {
+    if (window.i18n?.translatePage) window.i18n.translatePage();
     // Re-render dynamic content that uses t()
     loadDashboard();
     if (activeTabName === 'users') loadUsers();
 });
-document.addEventListener('localeChanged', function () {
-    if (window.i18n && window.i18n.translatePage) window.i18n.translatePage();
+document.addEventListener('localeChanged', () => {
+    if (window.i18n?.translatePage) window.i18n.translatePage();
     loadDashboard();
     if (activeTabName === 'users') loadUsers();
 });
diff --git a/static/js/views/device-verify/device-verify.js b/static/js/views/device-verify/device-verify.js
index 14a6a2d8..c62af2ab 100644
--- a/static/js/views/device-verify/device-verify.js
+++ b/static/js/views/device-verify/device-verify.js
@@ -1,7 +1,5 @@
 // device-verify.js — Extracted from inline <script> in device-verify.html
-(function () {
-    'use strict';
-
+(() => {
     var API_BASE = window.location.origin;
     var codeInput = document.getElementById('user-code');
     var deviceInfo = document.getElementById('device-info');
@@ -20,11 +18,11 @@
     }
 
     // Auto-insert hyphen and lookup on input
-    codeInput.addEventListener('input', function (e) {
-        var val = e.target.value.toUpperCase().replace(/[^A-Z0-9\-]/g, '');
+    codeInput.addEventListener('input', (e) => {
+        var val = e.target.value.toUpperCase().replace(/[^A-Z0-9-]/g, '');
         // Auto-insert hyphen after 4 chars
         if (val.length === 4 && val.indexOf('-') === -1) {
-            val = val + '-';
+            val = `${val}-`;
         }
         e.target.value = val;
         errorText.classList.add('hidden');
@@ -32,7 +30,7 @@
         // Debounce lookup
         clearTimeout(debounceTimer);
         if (val.length >= 9) {
-            debounceTimer = setTimeout(function () {
+            debounceTimer = setTimeout(() => {
                 lookupCode(val);
             }, 300);
         } else {
@@ -42,16 +40,16 @@
     });
 
     // Wire up approve / deny buttons (replaces inline onclick)
-    btnApprove.addEventListener('click', function () {
+    btnApprove.addEventListener('click', () => {
         handleAction('approve');
     });
-    btnDeny.addEventListener('click', function () {
+    btnDeny.addEventListener('click', () => {
         handleAction('deny');
     });
 
     async function lookupCode(code) {
         try {
-            var resp = await fetch(API_BASE + '/api/auth/device/verify?code=' + encodeURIComponent(code), {
+            const resp = await fetch(`${API_BASE}/api/auth/device/verify?code=${encodeURIComponent(code)}`, {
                 credentials: 'same-origin'
             });
             if (resp.status === 401) {
@@ -59,7 +57,7 @@
                 return;
             }
             if (!resp.ok) throw new Error('Lookup failed');
-            var data = await resp.json();
+            const data = await resp.json();
 
             if (data.valid) {
                 currentCode = code;
@@ -83,7 +81,7 @@
         btnDeny.disabled = true;
 
         try {
-            var resp = await fetch(API_BASE + '/api/auth/device/verify', {
+            const resp = await fetch(`${API_BASE}/api/auth/device/verify`, {
                 method: 'POST',
                 credentials: 'same-origin',
                 headers: Object.assign({ 'Content-Type': 'application/json' }, getCsrfHeaders()),
@@ -91,7 +89,7 @@
             });
 
             if (!resp.ok) {
-                var err = await resp.json().catch(function () {
+                const err = await resp.json().catch(() => {
                     return {};
                 });
                 throw new Error(err.message || 'Action failed');
diff --git a/static/js/views/nextcloud/error.js b/static/js/views/nextcloud/error.js
index 375be173..85fe5322 100644
--- a/static/js/views/nextcloud/error.js
+++ b/static/js/views/nextcloud/error.js
@@ -11,7 +11,7 @@ switch (errorType) {
         errorTitle.textContent = 'Login Failed';
         errorMessage.textContent = 'Invalid username or password. Please check your credentials and try again.';
         errorAction.textContent = 'Try Again';
-        errorAction.addEventListener('click', function () {
+        errorAction.addEventListener('click', () => {
             history.back();
         });
         break;
@@ -19,7 +19,7 @@ switch (errorType) {
         errorTitle.textContent = 'Session Expired';
         errorMessage.textContent = 'Your session has expired. Please try again.';
         errorAction.textContent = 'Close Window';
-        errorAction.addEventListener('click', function () {
+        errorAction.addEventListener('click', () => {
             window.close();
         });
         break;
@@ -27,7 +27,7 @@ switch (errorType) {
         errorTitle.textContent = 'Not Found';
         errorMessage.textContent = 'The requested page was not found.';
         errorAction.textContent = 'Close Window';
-        errorAction.addEventListener('click', function () {
+        errorAction.addEventListener('click', () => {
             window.close();
         });
         break;
@@ -35,7 +35,7 @@ switch (errorType) {
         errorTitle.textContent = 'Error';
         errorMessage.textContent = 'An unexpected error occurred. Please try again.';
         errorAction.textContent = 'Close Window';
-        errorAction.addEventListener('click', function () {
+        errorAction.addEventListener('click', () => {
             window.close();
         });
 }
diff --git a/static/js/views/nextcloud/login.js b/static/js/views/nextcloud/login.js
index 854a637b..86731ad5 100644
--- a/static/js/views/nextcloud/login.js
+++ b/static/js/views/nextcloud/login.js
@@ -6,22 +6,22 @@ if (!/^[0-9a-fA-F]+$/.test(token)) {
     document.body.innerHTML = '<p>Invalid session token.</p>';
     throw new Error('Invalid token format');
 }
-document.getElementById('login-flow-form').action = '/login/v2/flow/' + token;
+document.getElementById('login-flow-form').action = `/login/v2/flow/${token}`;
 
 // Check if OIDC is available and configure SSO button
-(async function () {
+(async () => {
     try {
-        var resp = await fetch('/api/auth/oidc/providers');
+        const resp = await fetch('/api/auth/oidc/providers');
         if (!resp.ok) return;
-        var info = await resp.json();
+        const info = await resp.json();
         if (!info.enabled) return;
 
         // Show OIDC section
         document.getElementById('oidc-section').classList.remove('hidden');
 
         // Update button text with provider name
-        var btn = document.getElementById('oidc-button');
-        btn.textContent = 'Sign in with ' + (info.provider_name || 'SSO');
+        const btn = document.getElementById('oidc-button');
+        btn.textContent = `Sign in with ${info.provider_name || 'SSO'}`;
 
         // If password login is disabled, hide the password form
         if (!info.password_login_enabled) {
@@ -29,10 +29,10 @@ document.getElementById('login-flow-form').action = '/login/v2/flow/' + token;
         }
 
         // SSO button redirects to the OIDC flow for this NC token
-        btn.addEventListener('click', function () {
-            window.location.href = '/login/v2/flow/' + token + '/oidc';
+        btn.addEventListener('click', () => {
+            window.location.href = `/login/v2/flow/${token}/oidc`;
         });
-    } catch (e) {
+    } catch (_e) {
         // OIDC not available — silently keep password-only mode
     }
 })();
diff --git a/static/js/views/nextcloud/success.js b/static/js/views/nextcloud/success.js
index 0dbf438f..ae0eb3ac 100644
--- a/static/js/views/nextcloud/success.js
+++ b/static/js/views/nextcloud/success.js
@@ -1,7 +1,7 @@
-document.getElementById('close-window-btn').addEventListener('click', function () {
+document.getElementById('close-window-btn').addEventListener('click', () => {
     window.close();
 });
 // Auto-close after 3 seconds
-setTimeout(function () {
+setTimeout(() => {
     window.close();
 }, 3000);
diff --git a/static/js/views/profile/profile.js b/static/js/views/profile/profile.js
index 18b21491..ebfdb6d3 100644
--- a/static/js/views/profile/profile.js
+++ b/static/js/views/profile/profile.js
@@ -15,7 +15,7 @@ function formatBytes(bytes) {
     const k = 1024,
         sizes = ['B', 'KB', 'MB', 'GB', 'TB'];
     const i = Math.floor(Math.log(bytes) / Math.log(k));
-    return parseFloat((bytes / Math.pow(k, i)).toFixed(1)) + ' ' + sizes[i];
+    return `${parseFloat((bytes / k ** i).toFixed(1))} ${sizes[i]}`;
 }
 
 function timeAgo(dateStr) {
@@ -32,7 +32,7 @@ function timeAgo(dateStr) {
 
 async function init() {
     try {
-        const resp = await fetch(API + '/auth/me', {
+        const resp = await fetch(`${API}/auth/me`, {
             headers: headers(),
             credentials: 'same-origin'
         });
@@ -50,10 +50,10 @@ async function init() {
         const badge = document.getElementById('p-role-badge');
         if (user.role === 'admin') {
             badge.className = 'role-badge role-badge-admin';
-            badge.innerHTML = '<i class="fas fa-shield-alt"></i> ' + t('profile.role_admin');
+            badge.innerHTML = `<i class="fas fa-shield-alt"></i> ${t('profile.role_admin')}`;
         } else {
             badge.className = 'role-badge role-badge-user';
-            badge.innerHTML = '<i class="fas fa-user"></i> ' + t('profile.role_user');
+            badge.innerHTML = `<i class="fas fa-user"></i> ${t('profile.role_user')}`;
         }
 
         document.getElementById('p-detail-username').textContent = user.username;
@@ -67,12 +67,12 @@ async function init() {
 
         document.getElementById('p-storage-used').textContent = formatBytes(used);
         document.getElementById('p-storage-quota').textContent = quota > 0 ? formatBytes(quota) : '∞';
-        document.getElementById('p-storage-pct').textContent = quota > 0 ? pct + '%' : '—';
+        document.getElementById('p-storage-pct').textContent = quota > 0 ? `${pct}%` : '—';
 
         const bar = document.getElementById('p-storage-bar');
-        bar.style.width = pct + '%';
-        bar.className = 'storage-fill ' + (pct > 90 ? 'red' : pct > 70 ? 'orange' : 'green');
-        document.getElementById('p-storage-text').textContent = formatBytes(used) + ' / ' + (quota > 0 ? formatBytes(quota) : t('profile.unlimited'));
+        bar.style.width = `${pct}%`;
+        bar.className = `storage-fill ${pct > 90 ? 'red' : pct > 70 ? 'orange' : 'green'}`;
+        document.getElementById('p-storage-text').textContent = `${formatBytes(used)} / ${quota > 0 ? formatBytes(quota) : t('profile.unlimited')}`;
 
         if (user.auth_provider && user.auth_provider !== 'local') {
             document.getElementById('password-section').classList.add('hidden');
@@ -81,7 +81,7 @@ async function init() {
         loadAppPasswords();
 
         try {
-            const oidcResp = await fetch(API + '/auth/oidc/providers', {
+            const oidcResp = await fetch(`${API}/auth/oidc/providers`, {
                 credentials: 'same-origin'
             });
             if (oidcResp.ok) {
@@ -90,7 +90,7 @@ async function init() {
                     document.getElementById('password-section').classList.add('hidden');
                 }
             }
-        } catch (oidcErr) {}
+        } catch (_oidcErr) {}
 
         document.getElementById('loading').classList.add('hidden');
         document.getElementById('main-content').classList.remove('hidden');
@@ -113,23 +113,21 @@ async function changePassword(e) {
     const statusEl = document.getElementById('pw-status');
 
     if (newPw !== confirmPw) {
-        statusEl.innerHTML =
-            '<div class="alert alert-error"><i class="fas fa-exclamation-circle"></i> ' + escapeHtml(t('profile.passwords_no_match')) + '</div>';
+        statusEl.innerHTML = `<div class="alert alert-error"><i class="fas fa-exclamation-circle"></i> ${escapeHtml(t('profile.passwords_no_match'))}</div>`;
         return false;
     }
 
     if (newPw.length < 8) {
-        statusEl.innerHTML =
-            '<div class="alert alert-error"><i class="fas fa-exclamation-circle"></i> ' + escapeHtml(t('profile.password_too_short')) + '</div>';
+        statusEl.innerHTML = `<div class="alert alert-error"><i class="fas fa-exclamation-circle"></i> ${escapeHtml(t('profile.password_too_short'))}</div>`;
         return false;
     }
 
     const btn = document.getElementById('pw-submit');
     btn.disabled = true;
-    btn.innerHTML = '<i class="fas fa-spinner fa-spin"></i> ' + escapeHtml(t('profile.updating'));
+    btn.innerHTML = `<i class="fas fa-spinner fa-spin"></i> ${escapeHtml(t('profile.updating'))}`;
 
     try {
-        const resp = await fetch(API + '/auth/change-password', {
+        const resp = await fetch(`${API}/auth/change-password`, {
             method: 'PUT',
             headers: headers(),
             credentials: 'same-origin',
@@ -140,7 +138,7 @@ async function changePassword(e) {
         });
 
         if (resp.ok) {
-            statusEl.innerHTML = '<div class="alert alert-success"><i class="fas fa-check-circle"></i> ' + escapeHtml(t('profile.password_updated')) + '</div>';
+            statusEl.innerHTML = `<div class="alert alert-success"><i class="fas fa-check-circle"></i> ${escapeHtml(t('profile.password_updated'))}</div>`;
             document.getElementById('password-form').reset();
         } else {
             const err = await resp.json().catch(() => ({}));
@@ -157,7 +155,7 @@ async function changePassword(e) {
     }
 
     btn.disabled = false;
-    btn.innerHTML = '<i class="fas fa-save"></i> ' + escapeHtml(t('profile.update_password'));
+    btn.innerHTML = `<i class="fas fa-save"></i> ${escapeHtml(t('profile.update_password'))}`;
     return false;
 }
 
@@ -193,7 +191,7 @@ function renderPwRow(pw) {
         btn.className = 'btn btn-danger-sm';
         btn.innerHTML = '<i class="fas fa-trash"></i>';
         btn.title = t('profile.revoke_title');
-        btn.addEventListener('click', function () {
+        btn.addEventListener('click', () => {
             revokeAppPassword(pw.id, pw.label);
         });
         actions.appendChild(btn);
@@ -204,7 +202,7 @@ function renderPwRow(pw) {
 
 async function loadAppPasswords() {
     try {
-        const resp = await fetch(API + '/auth/app-passwords', {
+        const resp = await fetch(`${API}/auth/app-passwords`, {
             headers: headers(),
             credentials: 'same-origin'
         });
@@ -214,7 +212,7 @@ async function loadAppPasswords() {
         }
         const data = await resp.json();
         const passwords = data.app_passwords || data;
-        const userPws = passwords.filter(function (pw) {
+        const userPws = passwords.filter((pw) => {
             return !isAutoPassword(pw);
         });
         const autoPws = passwords.filter(isAutoPassword);
@@ -264,17 +262,16 @@ async function createAppPassword() {
     const btn = document.getElementById('app-pw-generate');
 
     if (!label) {
-        statusEl.innerHTML =
-            '<div class="alert alert-error"><i class="fas fa-exclamation-circle"></i> ' + escapeHtml(t('profile.error_label_required')) + '</div>';
+        statusEl.innerHTML = `<div class="alert alert-error"><i class="fas fa-exclamation-circle"></i> ${escapeHtml(t('profile.error_label_required'))}</div>`;
         return;
     }
 
     btn.disabled = true;
-    btn.innerHTML = '<i class="fas fa-spinner fa-spin"></i> ' + escapeHtml(t('profile.generating'));
+    btn.innerHTML = `<i class="fas fa-spinner fa-spin"></i> ${escapeHtml(t('profile.generating'))}`;
     statusEl.innerHTML = '';
 
     try {
-        const resp = await fetch(API + '/auth/app-passwords', {
+        const resp = await fetch(`${API}/auth/app-passwords`, {
             method: 'POST',
             headers: headers(),
             credentials: 'same-origin',
@@ -295,19 +292,19 @@ async function createAppPassword() {
         labelInput.value = '';
         loadAppPasswords();
     } catch (err) {
-        statusEl.innerHTML = '<div class="alert alert-error"><i class="fas fa-exclamation-circle"></i> ' + err.message + '</div>';
+        statusEl.innerHTML = `<div class="alert alert-error"><i class="fas fa-exclamation-circle"></i> ${err.message}</div>`;
     } finally {
         btn.disabled = false;
-        btn.innerHTML = '<i class="fas fa-plus"></i> ' + escapeHtml(t('profile.generate'));
+        btn.innerHTML = `<i class="fas fa-plus"></i> ${escapeHtml(t('profile.generate'))}`;
     }
 }
 
 function copyAppPassword() {
     const pw = document.getElementById('app-pw-created-password').textContent;
-    navigator.clipboard.writeText(pw).then(function () {
+    navigator.clipboard.writeText(pw).then(() => {
         const btn = document.getElementById('app-pw-copy-btn');
         btn.innerHTML = '<i class="fas fa-check"></i>';
-        setTimeout(function () {
+        setTimeout(() => {
             btn.innerHTML = '<i class="fas fa-copy"></i>';
         }, 1500);
     });
@@ -316,7 +313,7 @@ function copyAppPassword() {
 async function revokeAppPassword(id, label) {
     if (!confirm(t('profile.confirm_revoke', { label: label }))) return;
     try {
-        const resp = await fetch(API + '/auth/app-passwords/' + encodeURIComponent(id), {
+        const resp = await fetch(`${API}/auth/app-passwords/${encodeURIComponent(id)}`, {
             method: 'DELETE',
             headers: headers(),
             credentials: 'same-origin'
@@ -348,9 +345,9 @@ document.getElementById('app-pw-copy-btn').addEventListener('click', copyAppPass
 document.getElementById('app-pw-auto-toggle').addEventListener('click', toggleAutoPasswords);
 
 /* Re-render when language changes */
-window.addEventListener('translationsLoaded', function () {
+window.addEventListener('translationsLoaded', () => {
     init();
 });
-window.addEventListener('localeChanged', function () {
+window.addEventListener('localeChanged', () => {
     init();
 });
diff --git a/static/js/views/shared/sharedView.js b/static/js/views/shared/sharedView.js
index f2dc2af6..18475259 100644
--- a/static/js/views/shared/sharedView.js
+++ b/static/js/views/shared/sharedView.js
@@ -181,7 +181,7 @@ const sharedView = {
             </div>
         `;
 
-        if (window.i18n && window.i18n.translateElement) {
+        if (window.i18n?.translateElement) {
             window.i18n.translateElement(container);
         }
     },
@@ -271,7 +271,9 @@ const sharedView = {
             option.addEventListener('click', (e) => {
                 e.stopPropagation();
                 // Update active state
-                dropdown.querySelectorAll('.shared-select-option').forEach((o) => o.classList.remove('active'));
+                dropdown.querySelectorAll('.shared-select-option').forEach((o) => {
+                    o.classList.remove('active');
+                });
                 option.classList.add('active');
                 // Update label
                 const label = toggle.querySelector('.shared-select-label');
@@ -529,8 +531,8 @@ const sharedView = {
                 write: permWrite ? permWrite.checked : false,
                 reshare: permReshare ? permReshare.checked : false
             },
-            password: enablePw && enablePw.checked && pwField && pwField.value ? pwField.value : null,
-            expires_at: enableExp && enableExp.checked && expField && expField.value ? Math.floor(new Date(expField.value).getTime() / 1000) : null
+            password: enablePw?.checked && pwField?.value ? pwField.value : null,
+            expires_at: enableExp?.checked && expField?.value ? Math.floor(new Date(expField.value).getTime() / 1000) : null
         };
 
         try {
@@ -588,7 +590,7 @@ const sharedView = {
             return;
         }
 
-        if (window.fileSharing && window.fileSharing.sendShareNotification) {
+        if (window.fileSharing?.sendShareNotification) {
             window.fileSharing
                 .sendShareNotification(this.currentItem.url, email, message)
                 .then(() => {
@@ -600,7 +602,7 @@ const sharedView = {
     },
 
     showNotification(message, type = 'success') {
-        if (window.ui && window.ui.showNotification) {
+        if (window.ui?.showNotification) {
             window.ui.showNotification(message, type);
         } else {
             alert(message);
@@ -616,7 +618,7 @@ const sharedView = {
     },
 
     translate(key, defaultText) {
-        if (window.i18n && window.i18n.t) return window.i18n.t(key, defaultText);
+        if (window.i18n?.t) return window.i18n.t(key, defaultText);
         return defaultText;
     }
 };