feat(web): /tags tabs + keyword surfacing + dup tab restyle

- /tags hosts four tabs (Labels (auto) / Keywords / Ratings / Colors),
  URL-driven with pagination on the label + keyword grids; ratings and
  colors stay as fixed buckets.
- /duplicates tabs (Stacks / Cross-folder) restyled to pill row in the
  Toolbar to match /tags; tab state moved into the route and bound to
  ?tab=...
- New aggregateKeywords() service fans out per-photo getPhoto calls so
  user-typed Details.Keywords surface on /tags (PhotoPrism's /labels
  only returns classifier output).
- RightSidebar renders photo.Labels[] as dashed-border chips after the
  Keywords section, each linking to /?q=label:slug.
- /colors and /ratings routes redirect to /tags?tab=colors|ratings so
  old bookmarks still land somewhere useful; LeftSidebar drops their
  entries and the Tags badge now sums labels + ratings + colors.
- listFolderCounts dedupes by UID (merged=false returns one row per
  FILE, so HEIC+JPG / Live Photo / RAW+JPG pairs were inflating folder
  counts ~2x).

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

web/src/lib/components/sidebar/RightSidebar.svelte

@@ -486,6 +486,33 @@
 		</div>
 	</div>
 
+	<!-- Auto-labels (PhotoPrism's TensorFlow classifier output). Read-only:
+	     editing labels requires re-indexing on PhotoPrism's side. The
+	     dashed border + lower contrast distinguishes them from the user-
+	     editable Keywords chips above. -->
+	{#if (photo.Labels ?? []).length > 0}
+		<div class="space-y-1">
+			<div
+				class="flex items-center gap-1 text-[10px] uppercase tracking-wide text-muted-foreground"
+			>
+				<Tag class="h-3 w-3" /> Labels (auto)
+			</div>
+			<div class="flex flex-wrap gap-1">
+				{#each photo.Labels ?? [] as lbl (lbl.UID ?? lbl.Label?.Slug)}
+					{@const slug = lbl.Label?.Slug}
+					{@const name = lbl.Label?.Name ?? slug ?? '(unknown)'}
+					<a
+						href={slug ? `/?q=${encodeURIComponent(`label:${slug}`)}` : '#'}
+						class="inline-flex items-center rounded-full border border-dashed border-border bg-muted/40 px-1.5 py-0.5 text-[10px] text-muted-foreground hover:text-foreground"
+						title={`Source: ${lbl.Source ?? 'classifier'}`}
+					>
+						{name}
+					</a>
+				{/each}
+			</div>
+		</div>
+	{/if}
+
 	<!-- GPS detail (collapsed by default) -->
 	<details class="rounded border border-border" open={Boolean(photo.Lat || photo.Lng)}>
 		<summary