docs: web comments say what the app does, not how it came to be (#6277)

Rewrites the web app's comments to rule 32. Task, milestone, rule and
spec ids are gone; regression stories are restated as the trap they
guard (public auth routes, the menu's stopPropagation, universal loads
under adapter-static, metric deltas with their margin). Flutter and
Tauri mentions now name the Android app or a native shell, operator
quotes and dates are dropped, and one library's counts no longer
appear outside test fixtures. Verified with a TypeScript-scanner token
comparison (template literals and regex literals re-scanned): only
comment text changed.

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

web/src/lib/playlists/playlistTrackToRef.ts

@@ -7,7 +7,7 @@
 //   - track_id is null — the track was removed from the library and only
 //     the playlist's text snapshot remains.
 //   - unavailable — the track is still there, with its history intact,
-//     but its file is missing from disk (#2527).
+//     but its file is missing from disk.
 // Callers filter nulls, which is what makes a missing file "get skipped"
 // everywhere a queue is built rather than at each call site.
 

web/src/lib/playlists/systemRefetch.ts

@@ -2,7 +2,7 @@ import type { TrackRef, PlaylistDetail } from '#lib/api/types.js';
 import { systemShuffle, getPlaylist } from '#lib/api/playlists.js';
 import { playlistTrackToRef } from './playlistTrackToRef';
 
-// #968: builds the self-heal closure for a system-playlist queue. On total
+// Builds the self-heal closure for a system-playlist queue. On total
 // playback failure (every queued track unplayable — typically a stale tab
 // left open across the daily rebuild) the player calls this to re-pull the
 // current snapshot and resume.