feat: Android download page, analysis retry and a collapsible search

- /android is a public page with the latest APK, the server address to copy
  and three install steps; linked from the sign-in screen and the profile menu
- failed audio analysis can be retried from the library page, which also shows
  the most common error; the analyzer no longer burns attempts on files that
  are missing because the disk is not mounted
- the top bar search folds into a round button and slides open on click, "/"
  or Ctrl+K

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

packages/i18n/locales/en/admin.json

@@ -160,7 +160,8 @@
     "wave_early_skip": "Early skips",
     "wave_likes": "Likes per 100",
     "wave_model": "Model version",
-    "wave_by_model": "Wave model versions compared"
+    "wave_by_model": "Wave model versions compared",
+    "analysis_retry": "Retry"
   },
   "write_template": {
     "title": "Uploads and path template",