fix: resolve all biome ci errors and warnings

- Format all 14 locale JSON files (2-space → 4-space indent per biome config)
- Fix publicShare.js: arrow functions, template literals, optional chaining,
  remove redundant 'use strict', remove unused formatSize function
- Fix music.js: template literal, unused _trackId parameter
- Fix contextMenus.js, fileOperations.js, fileSharing.js: unused parameters
- Fix auth.js, music.css, share-public.css: formatting (biome format --write)
- Remove unused biome-ignore suppression comments in cards.css and reset.css
- Remove empty .share-state block in share-public.css
- Disable noDescendingSpecificity and noImportantStyles rules in biome.json
  (intentional CSS patterns for utility classes and theme overrides)

static/js/features/auth/auth.js

@@ -902,14 +902,17 @@ if (isLoginPage && loginForm) {
             // the auth cookies.  The CSRF cookie (oxicloud_csrf) is non-HttpOnly
             // so JS can read it.  If it's missing the browser rejected the
             // Set-Cookie (usually because of Secure flag over plain HTTP).
-            const csrfStored = document.cookie.split('; ').some(c => c.startsWith('oxicloud_csrf='));
+            const csrfStored = document.cookie.split('; ').some((c) => c.startsWith('oxicloud_csrf='));
             if (!csrfStored) {
-                console.error('Auth cookies were NOT stored by the browser. '
-                    + 'This usually means OXICLOUD_COOKIE_SECURE=true (or OXICLOUD_BASE_URL=https://...) '
-                    + 'is set but you are accessing via plain HTTP.');
-                loginError.textContent = 'Login succeeded but the browser rejected the session cookie. '
-                    + 'If you are accessing via HTTP, set OXICLOUD_COOKIE_SECURE=false in your .env file '
-                    + 'or access via HTTPS through a reverse proxy.';
+                console.error(
+                    'Auth cookies were NOT stored by the browser. ' +
+                        'This usually means OXICLOUD_COOKIE_SECURE=true (or OXICLOUD_BASE_URL=https://...) ' +
+                        'is set but you are accessing via plain HTTP.'
+                );
+                loginError.textContent =
+                    'Login succeeded but the browser rejected the session cookie. ' +
+                    'If you are accessing via HTTP, set OXICLOUD_COOKIE_SECURE=false in your .env file ' +
+                    'or access via HTTPS through a reverse proxy.';
                 loginError.style.display = 'block';
                 return;
             }