111 of 122 top-level src/utils/ files move into 16 topic folders (audio,
cache, cover, share, server, playback, playlist, deviceSync, waveform,
mix, format, export, changelog, ui, perf, componentHelpers). True
singletons with no cluster stay at the utils/ root.
Pure file-move: a path-aware codemod rewrote 539 relative-import
specifiers across 275 files; no logic touched. The hot-path coverage
gate list (.github/frontend-hot-path-files.txt) is updated to the new
paths for the 11 gated utils files — a mechanical consequence of the
move, not a CI change. tsc is green.
The persist middleware's `onRehydrateStorage` callback was ~100 LOC
of legacy-shape migrations: hot-cache/preload mutual-exclusion reset,
lyricsServerFirst+enableNeteaselyrics → lyricsSources one-time
migration, Linux smooth-scroll one-shot, seekbar `'waveform'` →
`'truewave'` rename, animationMode/reducedAnimations cruft strip,
loudnessPreIsRefV1 reference recalibration, enableAppleMusicCoversDiscord
→ discordCoverSource enum migration, plus the sanitizers for
mixMinRating / randomMixSize / skipStarManualSkipCountsByKey.
Moved into `computeAuthStoreRehydration(state) → Partial<AuthState>`
in `authStoreRehydrate.ts`; the store's callback is now a four-line
wrapper. Pure code-move — same migration logic, same call order.
authStore.ts: 270 → 158 LOC (−112). Total Phase-E-auth journey:
889 → 158 LOC (−82%). All non-trivial content is now out of the
authStore body; what remains is state-init, 13 factory spreads, 2
derived getters, persist config, and the thin onRehydrate wrapper.
Frank Stellmacher