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/components/sidebar/RightSidebar.svelte

@@ -6,18 +6,20 @@
 	PUT (Details fields need the full body).
 -->
 <script lang="ts">
+	import { goto } from '$app/navigation';
 	import { page } from '$app/state';
 	import { createMutation, createQuery, useQueryClient } from '@tanstack/svelte-query';
 	import { toast } from 'svelte-sonner';
 	import {
 		Aperture,
+		ArrowUpRight,
 		Calendar,
-		ExternalLink,
 		File,
 		Folder,
 		HardDrive,
 		ImageIcon,
 		Loader2,
+		Map as MapIcon,
 		MapPin,
 		Star,
 		Tag,
@@ -39,6 +41,7 @@
 	import { push as pushUndo } from '$lib/stores/undo.svelte';
 	import { getMetadataSectionOpen, setMetadataSection } from '$lib/stores/view.svelte';
 	import { photoNameAndDir, primaryFile, type PpPhoto } from '$lib/types/photoprism';
+	import { navigateToFolder } from '$lib/stores/filters.svelte';
 	import { COLOR_SWATCHES } from '$lib/utils/tagGroups';
 	import { suggestDateFromPath } from '$lib/utils/suggestDateFromPath';
 
@@ -282,12 +285,6 @@
 				? photo.Country.toUpperCase()
 				: ''
 	);
-	const mapsHref = $derived(
-		photo.Lat && photo.Lng
-			? `https://www.openstreetmap.org/?mlat=${photo.Lat}&mlon=${photo.Lng}&zoom=15`
-			: ''
-	);
-
 	function formatCameraLens(c?: { Make?: string; Model?: string; Name?: string }): string {
 		if (!c) return '';
 		const make = c.Make ?? '';
@@ -377,16 +374,31 @@
 			</div>
 		{/if}
 
-		<!-- Folder (read-only). The `px-1 py-0.5` mirrors the input
-		     padding on filename / date so the read-only text starts at the
-		     same x-offset as the editable rows above — otherwise spans
-		     hug the icon while inputs sit 4px in. Root-level files render
-		     as `/` so the row never disappears and the layout stays stable. -->
+		<!-- Folder (read-only label + open-in-timeline icon). The `px-1 py-0.5`
+		     mirrors the input padding on filename / date so the read-only
+		     text starts at the same x-offset as the editable rows above —
+		     otherwise spans hug the icon while inputs sit 4px in. Root-level
+		     files render as `/` so the row never disappears. The arrow-up-
+		     right icon navigates to the timeline filtered by this folder
+		     with the photo pre-focused. -->
 		<div class="flex items-center gap-2">
 			<Folder class="h-3.5 w-3.5 shrink-0 text-muted-foreground" />
 			<span class="min-w-0 flex-1 truncate px-1 py-0.5 text-muted-foreground" title={folderLabel}>
 				{folderLabel}
 			</span>
+			<button
+				type="button"
+				class="text-muted-foreground hover:text-foreground"
+				onclick={() =>
+					void navigateToFolder(dirPath || '/', {
+						focusUid: photo.UID,
+						focusTakenAt: photo.TakenAt ?? null
+					})}
+				title="Open folder in timeline"
+				aria-label="Open folder in timeline"
+			>
+				<ArrowUpRight class="h-3 w-3" />
+			</button>
 		</div>
 
 		<!-- Dimensions -->
@@ -405,22 +417,29 @@
 			</span>
 		</div>
 
-		<!-- Location -->
+		<!-- Location (read-only label + open-on-map icon). The arrow-up-
+		     right icon flies the in-app map to the photo's coordinates at
+		     zoom 17 (close enough for the photo's marker to be its own,
+		     out of any cluster). Hidden when the photo has no
+		     coordinates. -->
 		<div class="flex items-center gap-2">
 			<MapPin class="h-3.5 w-3.5 shrink-0 text-muted-foreground" />
 			<span class="min-w-0 flex-1 truncate px-1 py-0.5 text-muted-foreground">
 				{placeLabel || 'No location'}
 			</span>
-			{#if mapsHref}
-				<a
-					href={mapsHref}
-					target="_blank"
-					rel="noopener"
+			{#if photo.Lat && photo.Lng}
+				<button
+					type="button"
 					class="text-muted-foreground hover:text-foreground"
-					title="Open in OpenStreetMap"
+					onclick={() =>
+						void goto(
+							`/map?lat=${photo.Lat}&lng=${photo.Lng}&zoom=17&focus=${photo.UID}`
+						)}
+					title="Open on map"
+					aria-label="Open on map"
 				>
-					<ExternalLink class="h-3 w-3" />
-				</a>
+					<MapIcon class="h-3 w-3" />
+				</button>
 			{/if}
 		</div>
 	</dl>