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/admin.json

@@ -62,5 +62,92 @@
       "user.password_reset": "Password reset",
       "user.delete": "User deleted"
     }
+  },
+  "sources": {
+    "title": "Storage",
+    "subtitle": "Where the server takes music from: a folder on the server or NFS",
+    "add": "Add storage",
+    "empty": "No storage yet. Connect a music folder to get started.",
+    "type_local": "Server folder",
+    "type_nfs": "NFS",
+    "status_pending": "Connecting",
+    "status_mounted": "Connected",
+    "status_error": "Error",
+    "status_disabled": "Disabled",
+    "last_scan": "Last scan: {{date}}",
+    "never_scanned": "Not scanned yet",
+    "scan": "Scan",
+    "full_scan": "Full scan",
+    "test": "Test",
+    "patterns": "Path patterns",
+    "edit": "Edit",
+    "delete": "Delete",
+    "disable": "Disable",
+    "enable": "Enable",
+    "delete_confirm": "Delete “{{name}}”? Tracks that exist only in this storage will disappear from the library along with their likes.",
+    "scanning": "Scanning: {{processed}} of {{total}}",
+    "scan_walking": "Walking folders…",
+    "scan_done": "Found {{found}} · new {{added}} · updated {{updated}} · moved {{moved}} · missing {{missing}} · errors {{errors}}",
+    "scan_failed": "Scan stopped: {{error}}",
+    "test_ok": "Reachable, audio files found: {{count}}",
+    "test_fail": "Not reachable: {{message}}",
+    "form_title_new": "New storage",
+    "form_title_edit": "Storage",
+    "name": "Name",
+    "type": "Type",
+    "folder": "Folder",
+    "folder_root": "Whole folder",
+    "folder_hint": "A subfolder of LIBRARY_HOST on the server",
+    "up": "Up",
+    "nfs_server": "Server",
+    "nfs_server_hint": "Host name or IP, e.g. nas.lan",
+    "nfs_export": "Export",
+    "nfs_export_hint": "Path on the server, e.g. /export/music",
+    "nfs_options": "Mount options",
+    "nfs_options_hint": "Read-only is added automatically",
+    "tag_priority": "Prefer",
+    "tags_first": "File tags",
+    "path_first": "Path patterns",
+    "interval": "Auto scan",
+    "interval_off": "Manual",
+    "interval_hours": "Every {{count}} h",
+    "save": "Save"
+  },
+  "patterns": {
+    "title": "Path patterns: {{name}}",
+    "intro": "RE2 regular expressions with named groups are matched against the file path relative to the storage root. The first match wins.",
+    "groups": "Groups: artist, albumartist, album, year, disc, track, title, genre; skip ignores the file.",
+    "add": "Add pattern",
+    "regex": "Pattern {{n}}",
+    "enabled": "Enabled",
+    "up": "Up",
+    "down": "Down",
+    "remove": "Remove",
+    "preview": "Preview",
+    "save": "Save",
+    "saved": "Saved. Run a full scan to apply it to files already found.",
+    "col_path": "Path",
+    "col_pattern": "Pattern",
+    "col_result": "Result",
+    "no_match": "no match",
+    "skipped": "skipped",
+    "unmatched": "No pattern matched: {{count}} of {{total}}",
+    "from_tags": "from tags",
+    "error_at": "Error in pattern {{n}}: {{reason}}",
+    "examples": "Examples"
+  },
+  "library": {
+    "title": "Library",
+    "subtitle": "Catalog and scan status",
+    "artists": "Artists",
+    "albums": "Albums",
+    "tracks": "Tracks",
+    "files": "Files",
+    "missing": "Missing files",
+    "errors": "Unreadable",
+    "sources": "Storage",
+    "error_files": "Files with errors",
+    "reindex": "Rebuild search index",
+    "reindex_started": "Rebuild started"
   }
 }