feat(queue): persist queue header duration mode (#724)

* feat(queue): persist header duration mode (#625)

The queue header chip cycles total / remaining / ETA, but the choice
lived in QueuePanel `useState` and reset to 'total' on every app launch.
Move it into `authStore` (persisted under `psysonic-auth`) so the chosen
mode survives restarts like other UI preferences.

- `DurationMode` consolidated in `authStoreTypes` (re-exported from
  `queuePanelHelpers` so existing component imports stay valid).
- New `queueDurationDisplayMode` field + `setQueueDurationDisplayMode`
  setter wired through `createUiAppearanceActions`, default `'total'`.
- `computeAuthStoreRehydration` validates the persisted value against
  the three known modes (pattern matches the existing seekbarStyle
  block) — garbage, null, undefined, or a missing key map back to
  `'total'` so the chip never receives an unknown mode.
- `QueuePanel` reads / writes via `useAuthStore` selectors instead of
  local `useState`.
- Tests: trivial-setter coverage in `authStore.settings.test.ts` and a
  new `authStoreRehydrate.test.ts` covering corrupt, missing, and
  valid rehydration cases.

Reuses kveld9's design from PR #625; not merged because the 1.46
refactor split locales and reshuffled queue-helper exports. Credited
via Co-Authored-By trailer.

Co-Authored-By: Kveld. <kveld912@proton.me>

* docs(changelog): queue header duration mode persistence (#724)

Adds the CHANGELOG entry + kveld9 credits line referencing the real PR
numbers (no #TBD placeholder) — feedback.md §2.7+§2.8 workflow: commit
docs as a second push onto the open PR.

---------

Co-authored-by: Kveld. <kveld912@proton.me>

src/store/authUiAppearanceActions.ts

@@ -22,6 +22,7 @@ export function createUiAppearanceActions(set: SetState): Pick<
   | 'setLinuxWebkitKineticScroll'
   | 'setSeekbarStyle'
   | 'setQueueNowPlayingCollapsed'
+  | 'setQueueDurationDisplayMode'
   | 'setShowFullscreenLyrics'
   | 'setFsLyricsStyle'
   | 'setSidebarLyricsStyle'
@@ -42,6 +43,7 @@ export function createUiAppearanceActions(set: SetState): Pick<
     setLinuxWebkitKineticScroll: (v) => set({ linuxWebkitKineticScroll: v }),
     setSeekbarStyle: (v) => set({ seekbarStyle: v }),
     setQueueNowPlayingCollapsed: (v) => set({ queueNowPlayingCollapsed: v }),
+    setQueueDurationDisplayMode: (v) => set({ queueDurationDisplayMode: v }),
     setShowFullscreenLyrics: (v) => set({ showFullscreenLyrics: v }),
     setFsLyricsStyle: (v) => set({ fsLyricsStyle: v }),
     setSidebarLyricsStyle: (v) => set({ sidebarLyricsStyle: v }),