feat(web): scope library views to per-user BasePath

PhotoPrism's user entity carries a per-user BasePath; the web app now
mirrors that scope client-side so each user sees only their own subtree
in the sidebar, timeline, folder counts, and heap-convert target picker.
Admin without a BasePath is unchanged. Also removes the redundant
"✕ <folder>" pill below the folder tree.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

web/src/lib/components/layout/HeapConvertDialog.svelte

@@ -24,7 +24,7 @@
 		type PpFolder
 	} from '$lib/services/photoprism';
 	import { filters, setSection } from '$lib/stores/filters.svelte';
-	import { isAuthenticated } from '$lib/stores/session.svelte';
+	import { isAuthenticated, toOriginalsPath } from '$lib/stores/session.svelte';
 	import FolderTree, { buildTree } from './FolderTree.svelte';
 
 	interface Props {
@@ -95,10 +95,13 @@
 		// pickedPath === '' is the root selection; falsy check would
 		// wrongly block it. Distinguish `null` (nothing picked) from `''`.
 		if (!heap || pickedPath === null) return;
+		// pickedPath is user-relative (listFolders strips BasePath). The
+		// sidecar moves files on disk so it needs a server-absolute path —
+		// translate before submitting.
 		convertMut.mutate({
 			uid: heap.UID,
 			body: {
-				targetFolder: pickedPath,
+				targetFolder: toOriginalsPath(pickedPath),
 				mode,
 				subfolder: subfolder.trim() || null,
 				deleteHeap: mode === 'move' && deleteHeap

web/src/lib/components/layout/LeftSidebar.svelte

@@ -34,7 +34,7 @@
 		setSection,
 		type Section
 	} from '$lib/stores/filters.svelte';
-	import { isAuthenticated, session } from '$lib/stores/session.svelte';
+	import { isAuthenticated, session, userBasePath } from '$lib/stores/session.svelte';
 	import FolderTree, { buildTree } from './FolderTree.svelte';
 	import GeneralSettingsDialog from './GeneralSettingsDialog.svelte';
 	import HeapConvertDialog from './HeapConvertDialog.svelte';
@@ -158,15 +158,24 @@
 	}));
 	const folderCounts = $derived(folderCountsQuery.data ?? {});
 
-	// Root entry shows the whole library — see applyFolderScope() on /
-	// timeline. PhotoPrism's `count.all` from /api/v1/config is the
-	// authoritative library total (kept in sync server-side), so use it
-	// directly. Earlier this subtracted Σ(folderCounts) from total, which
-	// worked when folderCounts were direct-child only; now that the
-	// sidecar fan-out recurses (see handlers_folders.go), every photo
-	// gets summed once per ancestor — the subtraction would double-count
-	// and drive rootCount to 0.
-	const rootCount = $derived(configQuery.data?.count?.all ?? 0);
+	// Root entry shows "the user's library" — for admins without a
+	// BasePath that's still the whole library, served cheaply from
+	// /api/v1/config's `count.all`. For any user with a non-empty
+	// BasePath the precomputed total is wrong (it's library-wide), so we
+	// ask the sidecar for a recursive count rooted at the user's
+	// BasePath — listFolderCounts maps `""` through toOriginalsPath, which
+	// resolves to the BasePath itself, and the sidecar fan-out recurses.
+	const scopedRootCountQuery = createQuery<Record<string, number>>(() => ({
+		queryKey: ['photos', 'root-count', userBasePath()],
+		queryFn: () => listFolderCounts(['']),
+		enabled: isAuthenticated() && userBasePath() !== '',
+		staleTime: 60_000
+	}));
+	const rootCount = $derived(
+		userBasePath() === ''
+			? (configQuery.data?.count?.all ?? 0)
+			: (scopedRootCountQuery.data?.[''] ?? 0)
+	);
 
 	const createMut = createMutation(() => ({
 		mutationFn: (title: string) => createHeap(title),
@@ -565,18 +574,6 @@
 				counts={folderCounts}
 			/>
 		{/if}
-		{#if filters.folderPath && filters.folderPath !== '/'}
-			<button
-				class="mt-1 flex h-[22px] w-full items-center rounded px-2 text-[11px] leading-tight text-muted-foreground hover:bg-accent hover:text-foreground"
-				onclick={() => {
-					setFolderPath(null);
-					void goto('/', { keepFocus: true, noScroll: true });
-				}}
-				title="Clear folder filter"
-			>
-				<span class="truncate">✕ {filters.folderPath}</span>
-			</button>
-		{/if}
 	</div>
 
 	<!-- Views — everyday browse entries (section + route mixed) under

web/src/lib/components/layout/SettingsDialog.svelte

@@ -23,6 +23,7 @@
 		type PpLogEntry,
 		type PpSettings
 	} from '$lib/services/photoprism';
+	import { userBasePath } from '$lib/stores/session.svelte';
 
 	interface Props {
 		open: boolean;
@@ -71,7 +72,16 @@
 	}
 
 	// ── Index tab ─────────────────────────────────────────────────────────
-	let indexForm = $state<IndexBody>({ path: '/', rescan: false, cleanup: false });
+	// Default the reindex path to the user's BasePath when scoping is on,
+	// so non-admins (and admins-with-BasePath) only rescan their own
+	// subtree. PhotoPrism's /index expects originals-relative paths with
+	// a leading slash; `'/'` means the whole library.
+	const _bp = userBasePath();
+	let indexForm = $state<IndexBody>({
+		path: _bp === '' ? '/' : `/${_bp}`,
+		rescan: false,
+		cleanup: false
+	});
 	const startIndexMut = createMutation(() => ({
 		mutationFn: (b: IndexBody) => startIndex(b),
 		onSuccess: (r) => toast.success(r.message || 'Indexing complete'),