feat(preview): inline split-pane preview + sidebar metadata pass

Replace the fullscreen PreviewOverlay with an inline top pane above
each grid surface. SplitGrid + InlinePreview render the focused
photo/video inside the host page; a resizableVertical action drives
the divider and the height persists via the view store. Applied to
the timeline, /tags drill-in, /review cause tabs, /photo/[uid], and
/map. selection.focused is now the single source of truth for both
the inline pane and the right sidebar — preview.svelte store and
PreviewOverlay are removed.

Sidebar: drop the thumb; lead with icon-led filename and folder
rows that match the date/place rhythm. Move dims+size to the top
(below date) and camera/lens/exposure into the collapsible File
section. Read-only spans share the input padding so the text column
aligns across rows. Folder row sits between date and dims+size.

VideoPlayer: stop forcing width/height: 100% so videos honour their
intrinsic aspect ratio inside the pane. Key the player on file hash
in InlinePreview so navigating between videos remounts the element
and autoplay fires again.

Sidebar (LeftSidebar): switch the labels badge to a dedicated
countPhotos('label:*') query so it reports photos with a label
rather than PhotoPrism's category roll-up.

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

web/src/routes/map/+page.svelte

@@ -7,9 +7,10 @@
 		type MapSourceDataEvent
 	} from 'maplibre-gl';
 	import 'maplibre-gl/dist/maplibre-gl.css';
+	import { goto } from '$app/navigation';
 	import { listGeo, type PpGeoCollection, type PpGeoFeature } from '$lib/services/photoprism';
 	import { isAuthenticated, thumbUrl } from '$lib/stores/session.svelte';
-	import { openPreview } from '$lib/stores/preview.svelte';
+	import { setAnchor, setFocused, setOrder } from '$lib/stores/selection.svelte';
 	import Toolbar from '$lib/components/layout/Toolbar.svelte';
 
 	const geoQuery = createQuery<PpGeoCollection>(() => ({
@@ -154,7 +155,10 @@
 		el.style.backgroundImage = `url(${thumbUrl(hash, 'tile_50')})`;
 		el.addEventListener('click', (ev) => {
 			ev.stopPropagation();
-			openPreview(uid, allUids);
+			setOrder(allUids);
+			setFocused(uid);
+			setAnchor(uid);
+			void goto('/');
 		});
 		return el;
 	}