web: deep-link from RightSidebar to folder/map + anchor-mode timeline + fix root count

RightSidebar:
- Folder + Location rows gain a small ArrowUpRight icon button that
  deep-links into the timeline / map view focused on the photo. OSM
  external link removed; the in-app map nav covers the same job.

Folder navigation:
- New navigateToFolder(path, { focusUid, focusTakenAt }) helper in the
  filters store; LeftSidebar's pickFolder collapses to a one-liner that
  reuses it.
- One-shot pending-focus stash carries both UID and TakenAt across the
  goto. URL-watch effect on the timeline consumes the stash so even
  same-folder navigations (where the filter doesn't change) get
  picked up.

Anchor-mode timeline query:
- listPhotosAround(q, takenAt, after, before) issues two parallel
  PhotoPrism calls (`after:<day-1>` oldest-first + `before:<day+1>`
  newest-first), merges + dedupes newest-first. Uses PhotoPrism's
  existing date-only DSL clauses — no server changes.
- When a deep-link stashes a TakenAt, page 0 of the photosQuery uses
  the merged window so the target photo is loaded even for photos
  buried past the standard newest-first cursor. Pages 1+ are disabled
  in anchor mode (PhotoPrism's day-precision cursor would infinite-loop
  on dense days; users see 120 around the target, refresh to drop the
  anchor).
- After page 0 lands, the existing scrollToIndex(targetIdx) expands the
  windowed render set + scrolls the tile into view.

Map view:
- /map honors `?lat=&lng=&zoom=&focus=` URL params, jumping to the
  photo's coordinates at zoom 17 instead of fitBounds-ing the full
  library. Params are stripped after first apply so a manual zoom-out
  + reload doesn't snap back.

LeftSidebar root count badge:
- Now matches what Cmd+A selects in the timeline. Old code used
  /config.count.all (library aggregate, includes archived/hidden/
  review). Switched to countPhotos('', { merged: true }) which counts
  the actual photo entries the timeline lists.
- countPhotos gains a `merged` option; with merged=true it returns the
  response body length instead of the X-Count header — PhotoPrism's
  X-Count is always the file-row count regardless of merged, so a
  HEIC + JPG companion pair inflated the badge to 2.

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

web/src/lib/services/photoprism.ts

@@ -156,6 +156,95 @@ export async function listPhotos(params: ListPhotosParams = {}): Promise<PpPhoto
 	return data;
 }
 
+/**
+ * Fetch a page of photos *anchored at* a specific TakenAt — `before`
+ * older photos preceded by `after` newer ones, merged newest-first.
+ * Uses PhotoPrism's `before:`/`after:` DSL clauses so the anchor's
+ * neighbours can be loaded without paging through the whole filter.
+ *
+ * Used by the timeline's deep-link focus mode: an in-app navigation
+ * stashes `{uid, takenAt}`, the timeline calls this with the anchor's
+ * date for page 0, and the target photo lands ~`afterCount` tiles
+ * down with `~beforeCount` older neighbours below it.
+ *
+ * Subsequent infinite-scroll pages use plain `listPhotos` with the
+ * standard offset cursor — the anchor mode only matters for page 0.
+ */
+export interface AroundParams {
+	/** Base DSL filter (e.g. `path:"2024/02*"`). Anchor clauses are appended. */
+	q?: string;
+	/** Anchor's TakenAt as ISO string (e.g. `'2026-01-31T18:26:40Z'`). */
+	takenAt: string;
+	/** How many photos newer than the anchor to fetch. */
+	afterCount?: number;
+	/** How many photos at-or-older-than the anchor to fetch (includes the anchor itself). */
+	beforeCount?: number;
+	merged?: boolean;
+}
+
+export async function listPhotosAround(p: AroundParams): Promise<PpPhoto[]> {
+	const afterCount = p.afterCount ?? 30;
+	const beforeCount = p.beforeCount ?? 90;
+	const baseQ = p.q?.trim() ?? '';
+	// PhotoPrism's `before:`/`after:` operators take ISO timestamps.
+	// `+1s` / `-1s` makes the bounds inclusive of the anchor itself in
+	// the `before:` half (so the target tile is in the merged result).
+	const anchorDate = new Date(p.takenAt);
+	if (Number.isNaN(anchorDate.getTime())) {
+		// Date parse failed — fall back to a plain newest-first page.
+		return listPhotos({ q: baseQ, count: afterCount + beforeCount, order: 'newest', merged: p.merged });
+	}
+	// PhotoPrism's DSL accepts date-only bounds (`YYYY-MM-DD`). Round
+	// up/down by a day so the anchor's own day is included in the
+	// `before:` half — the bounds are inclusive day boundaries, so a
+	// timestamp-precision anchor lands inside the `[beforeBound,
+	// afterBound]` window.
+	function ymd(d: Date): string {
+		const y = d.getUTCFullYear();
+		const m = String(d.getUTCMonth() + 1).padStart(2, '0');
+		const dd = String(d.getUTCDate()).padStart(2, '0');
+		return `${y}-${m}-${dd}`;
+	}
+	const dayMs = 86_400_000;
+	const beforeBound = ymd(new Date(anchorDate.getTime() + dayMs));
+	const afterBound = ymd(new Date(anchorDate.getTime() - dayMs));
+	const newerQ = `${baseQ} after:${afterBound}`.trim();
+	const olderQ = `${baseQ} before:${beforeBound}`.trim();
+
+	const [newerOldestFirst, older] = await Promise.all([
+		listPhotos({
+			q: newerQ,
+			count: afterCount,
+			order: 'oldest',
+			merged: p.merged ?? true
+		}),
+		listPhotos({
+			q: olderQ,
+			count: beforeCount,
+			order: 'newest',
+			merged: p.merged ?? true
+		})
+	]);
+	// `newerOldestFirst` is oldest→newest; reverse so it reads newest-first
+	// to match the standard timeline order, then concat the older window.
+	// Dedupe by UID in case the anchor itself shows up in both halves.
+	const merged: PpPhoto[] = [];
+	const seen = new Set<string>();
+	for (const p of newerOldestFirst.slice().reverse()) {
+		if (!seen.has(p.UID)) {
+			merged.push(p);
+			seen.add(p.UID);
+		}
+	}
+	for (const p of older) {
+		if (!seen.has(p.UID)) {
+			merged.push(p);
+			seen.add(p.UID);
+		}
+	}
+	return merged;
+}
+
 /**
  * Count photos matching a DSL query, scoped to whatever the caller's
  * session ACL allows. PhotoPrism doesn't expose a dedicated "count
@@ -169,10 +258,17 @@ export async function listPhotos(params: ListPhotosParams = {}): Promise<PpPhoto
  * the signed-in user actually sees, not the global library aggregate
  * exposed by `/config.count`.
  */
-export async function countPhotos(q: string): Promise<number> {
-	const resp = await http.get('/photos', {
-		params: { count: 10000, offset: 0, merged: false, q }
+export async function countPhotos(q: string, opts: { merged?: boolean } = {}): Promise<number> {
+	const merged = opts.merged ?? false;
+	const resp = await http.get<PpPhoto[]>('/photos', {
+		params: { count: 10000, offset: 0, merged, q }
 	});
+	// PhotoPrism's `X-Count` header counts SQL file rows (one row per
+	// `Files[]` entry), regardless of `merged`. With `merged: true` the
+	// response body is one entry per logical photo — so the body length
+	// is the canonical photo count when callers need to match what the
+	// timeline displays (e.g. the LeftSidebar root badge vs `Cmd+A`).
+	if (merged) return Array.isArray(resp.data) ? resp.data.length : 0;
 	const header = resp.headers['x-count'];
 	const n = typeof header === 'string' ? parseInt(header, 10) : NaN;
 	return Number.isFinite(n) ? n : 0;