feat(web): storage admin, search and catalog pages (M2)

- Storage admin: local folders with a folder picker and NFS sources,
  connection test, scan and full scan with live progress, enable,
  disable, delete
- path pattern editor with reorder, examples and a preview table that
  shows which pattern matched and what came from tags; compile errors
  land under the broken pattern
- Library page with counters, scans and unreadable files; search
  reindex for admins
- search box in the top bar: combobox with keyboard navigation, 150 ms
  debounce, cancelled stale requests, "/" and Ctrl+K, layout fix hint
- search page with tabs and paging, artist and album pages, album
  cards and track lists; unavailable tracks are dimmed

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

packages/i18n/locales/en/common.json

@@ -23,7 +23,9 @@
     "home": "Home",
     "admin": "Admin",
     "users": "Users",
-    "audit": "Audit log"
+    "audit": "Audit log",
+    "library": "Library",
+    "sources": "Storage"
   },
   "profile": {
     "menu": "Profile menu",
@@ -79,5 +81,41 @@
   "loading": "Loading…",
   "route_error": {
     "reload": "Reload the page"
+  },
+  "search": {
+    "placeholder": "Artists, albums, tracks",
+    "label": "Search",
+    "artists": "Artists",
+    "albums": "Albums",
+    "tracks": "Tracks",
+    "all": "All",
+    "nothing": "Nothing found",
+    "corrected": "Showing results for “{{query}}”",
+    "show_all": "All results",
+    "title": "Search: {{query}}",
+    "more": "Show more",
+    "artist_kind": "Artist",
+    "hint": "Press / to search"
+  },
+  "catalog": {
+    "albums": "Albums",
+    "appears_on": "Appears on",
+    "album_count_one": "{{count}} album",
+    "album_count_other": "{{count}} albums",
+    "album_count_few": "{{count}} albums",
+    "album_count_many": "{{count}} albums",
+    "track_count_one": "{{count}} track",
+    "track_count_other": "{{count}} tracks",
+    "track_count_few": "{{count}} tracks",
+    "track_count_many": "{{count}} tracks",
+    "unavailable": "Unavailable: storage is offline or the file is gone",
+    "not_found": "Nothing here — it may have been removed by the last scan",
+    "disc": "Disc {{n}}",
+    "col_title": "Title",
+    "col_album": "Album",
+    "col_duration": "Time",
+    "back_home": "Back home",
+    "artist": "Artist",
+    "album": "Album"
   }
 }