feat(places): photo map view (MapLibre + PMTiles, Approach A)

Adds a Places tab to the Photos section: a self-hosted MapLibre GL map of
the user's geotagged photos.

- places.js: lazy-loads vendored MapLibre + pmtiles.js on first open; draws
  the server-aggregated clusters (GET /api/photos/geo) as HTML thumbnail
  markers (no glyphs/sprites, no client-side clustering); pan/zoom refetches
  for the new viewport; click a cluster to zoom in, or a single photo to
  open it in the lightbox.
- Optional vector basemap read directly from /basemaps/basemap.pmtiles over
  HTTP Range (label-light Protomaps style, light/dark aware); falls back to
  a themed background when no basemap is present. ODbL attribution shown.
- "Moments | Places" sub-nav wired into the Photos section.
- enable_places now defaults on, since the route + UI are ready.

No new backend serving code: tower-http ServeDir already serves static/
with Range, so the .pmtiles basemap is just a static file.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01JW6ghFMDtnRYuYNzZhb47M

static/locales/en.json

@@ -73,7 +73,11 @@
         "delete_selected_confirm": "Move the selected items to Trash?",
         "delete_one_confirm": "Move \"{{name}}\" to Trash?",
         "layout_square": "Grid",
-        "layout_justified": "Justified"
+        "layout_justified": "Justified",
+        "tab_moments": "Moments",
+        "tab_places": "Places",
+        "map_loading": "Loading map…",
+        "map_error": "Could not load the map"
     },
     "music": {
         "create_playlist": "Create Playlist",