Three factories for the actions that carry real logic (not just
`set({ field: v })` pass-through):
- `createSkipStarActions` — skip-to-1★ counter with threshold check
and per-`<activeServerId><trackId>` storage key. Disabling the
feature wipes the counter map so a re-enable doesn't resume from
stale partial counts. Crossing the threshold deletes the key so
the next session starts fresh.
- `createMusicLibraryActions` — `setMusicFolders` falls back to
`'all'` when the persisted filter points at a folder the server
no longer reports; `setMusicLibraryFilter` bumps
`musicLibraryFilterVersion` so subscribed pages refetch.
- `createPerServerCapabilityActions` — `setEntityRatingSupport`,
`setAudiomuseNavidromeEnabled`, `setSubsonicServerIdentity`,
`setInstantMixProbe`, `setAudiomuseNavidromeIssue`. Each branch
knows which neighbouring per-server maps to wipe when the input
invalidates them (identity not AudioMuse-eligible / probe empty /
audiomuse disabled).
Pure code-move. authStore.ts: 384 → 270 LOC (−114). All trivial-setter
and logic-bearing action bodies are now out of the store body; only
the persist config + `onRehydrateStorage` migration block remains as
a non-factory chunk (target for E.47).
Frank Stellmacher