feat(drag&drop): no drop zone on search page

frontend/src/routes/search/+page.svelte

@@ -11,6 +11,7 @@
 	import Icon from '$lib/icons/Icon.svelte';
 	import { t } from '$lib/i18n/index.svelte';
 	import { files as filesStore } from '$lib/stores/files.svelte';
+	import { ui } from '$lib/stores/ui.svelte';
 	import { formatBytes } from '$lib/utils/format';
 	import { formatDate, iconNameFromClass, fileIconKindClass } from '$lib/utils/display';
 
@@ -202,10 +203,61 @@
 		void dateFilter;
 		void run(query);
 	});
+
+	/**
+	 * Page-wide OS drag/drop guard.
+	 *
+	 * `/search` has no upload path, but without capturing the drop the
+	 * browser's default handler navigates to the dropped file — the tab
+	 * REPLACES the app with the file itself, which is data-loss-esque
+	 * (user loses their in-progress search + any unsaved UI state).
+	 * The `ResourceList`-based views (`/photos`, `/shared`, `/trash`, …)
+	 * already fire a "wrong drop zone" toast via their `.rl-root`
+	 * wrapper when `enableSystemDrop` is false — this handler brings
+	 * `/search` to the same contract, and covers the whole viewport
+	 * (not just a list surface) so drops on the sticky header /
+	 * result-card margins are caught too. Same toast copy + "Go to
+	 * Files" action as `ResourceList` for a consistent recovery UX.
+	 */
+	function onWindowDragOver(e: DragEvent) {
+		if (!e.dataTransfer?.types?.includes('Files')) return;
+		if (e.defaultPrevented) return;
+		e.preventDefault();
+		// `dropEffect = 'none'` would tell the browser to REJECT the
+		// drop before `drop` fires — the toast path below never runs.
+		// Accept at the pointer level and let `onWindowDrop` decide.
+		if (e.dataTransfer) e.dataTransfer.dropEffect = 'copy';
+	}
+	function onWindowDrop(e: DragEvent) {
+		if (!e.dataTransfer?.types?.includes('Files')) return;
+		if (e.defaultPrevented) return;
+		e.preventDefault();
+		ui.notify(
+			t(
+				'resource_list.wrong_drop_zone_msg',
+				'Uploads only work in Files — open the Files section and drop there.'
+			),
+			'warning',
+			6000,
+			true,
+			{
+				action: {
+					label: t('resource_list.wrong_drop_zone_action', 'Go to Files'),
+					// Best-effort recovery — the drop's `DataTransfer` is
+					// discarded once this handler returns (browsers don't
+					// persist it across a navigation), so we land the
+					// user in `/files` where they can re-drag from the OS.
+					onClick: () => goto(resolve('/files'))
+				}
+			}
+		);
+	}
 </script>
 
 <svelte:head><title>{t('search.title', 'Search')} · OxiCloud</title></svelte:head>
 
+<svelte:window ondragover={onWindowDragOver} ondrop={onWindowDrop} />
+
 <div class="page-sticky-header search-head">
 	<h1 class="page-title">
 		{#if query}{t('search.results_for', { q: query }, 'Results for “{{q}}”')}{:else}{t(