feat(search): add breadcrumb if a folder is provided

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

@@ -11,7 +11,7 @@
 	import { page } from '$app/state';
 	import { searchResources } from '$lib/api/endpoints/search';
 	import { fileDownloadUrl, renameFile, deleteFile } from '$lib/api/endpoints/files';
-	import { renameFolder, deleteFolder } from '$lib/api/endpoints/folders';
+	import { renameFolder, deleteFolder, getFolder, getFolderName } from '$lib/api/endpoints/folders';
 	import {
 		addFavorite,
 		removeFavorite,
@@ -47,6 +47,37 @@
 	// this session (the pre-URL-param behaviour).
 	const effectiveFolder = $derived(scopeFolderId ?? filesStore.currentFolder ?? null);
 
+	// Breadcrumb — resolves the scope folder's display name so the sticky
+	// header can show WHICH directory the results come from ("we have no
+	// clue on which directory the search was done" — Ed 2026-07-26).
+	// `getFolderName` is a sync cache peek populated by prior /files
+	// listings; on a cold /search deep-link we fall back to `getFolder`
+	// once, cache the result, and re-render. `$state<string | null>`
+	// with a `$effect` primer avoids blocking the initial render.
+	let scopeFolderName = $state<string | null>(null);
+	$effect(() => {
+		if (!scopeFolderId) {
+			scopeFolderName = null;
+			return;
+		}
+		const cached = getFolderName(scopeFolderId);
+		if (cached) {
+			scopeFolderName = cached;
+			return;
+		}
+		// Cold deep-link — fire once, populate on resolve. If it fails
+		// (folder was deleted, caller lost Read), keep name null so the
+		// breadcrumb just falls back to a short UUID.
+		const id = scopeFolderId;
+		void getFolder(id)
+			.then((f) => {
+				if (scopeFolderId === id) scopeFolderName = f.name;
+			})
+			.catch(() => {
+				if (scopeFolderId === id) scopeFolderName = id.slice(0, 8);
+			});
+	});
+
 	// Rendered as `<h1 class="page-title">` inside ResourceList. Bakes the
 	// query time / result count into the title string because ResourceList
 	// doesn't (yet) expose a subtitle slot, and lifting the "Xms" affordance
@@ -709,6 +740,41 @@
 				</button>
 			{/if}
 		{/snippet}
+		{#snippet breadcrumb()}
+			<!--
+				Only render when the search is folder-scoped AND the URL
+				param is present — the sticky "Home > Photos" cue answers
+				the "which directory was this search done in?" question
+				Ed raised 2026-07-26. Hidden for scope='all' (searching
+				everywhere → no folder to breadcrumb) and for a fresh
+				`/search?q=…` with no `in=` param.
+
+				Single-segment for now (Home icon + scope folder as a
+				link). Full parent-chain walk is a follow-up; it needs
+				stepping through `parent_id` via `getFolder`, which
+				would be a second pass here.
+			-->
+			{#if scope === 'folder' && scopeFolderId}
+				<nav class="breadcrumb" aria-label={t('breadcrumb.aria', 'Breadcrumb')}>
+					<a
+						href={resolve('/files')}
+						class="breadcrumb-item breadcrumb-home breadcrumb-link"
+						title={t('breadcrumb.home', 'Home')}
+						data-testid="search-breadcrumb-home-link"
+					>
+						<Icon name="home" />
+					</a>
+					<span class="breadcrumb-separator">&gt;</span>
+					<a
+						href={resolve(`/files/${scopeFolderId}`)}
+						class="breadcrumb-item breadcrumb-current breadcrumb-link"
+						data-testid="search-breadcrumb-folder-link"
+					>
+						{scopeFolderName ?? '…'}
+					</a>
+				</nav>
+			{/if}
+		{/snippet}
 		{#snippet itemActions(item)}
 			<!--
 				Per-row "Open parent folder" quick-action — search results