feat(perf): 3-state animation mode (Full / Reduced / Static) (#441)

* feat(perf): 3-state animation mode (Full / Reduced / Static)

Replaces the boolean `reducedAnimations` toggle with a three-way
`animationMode` setting, suggested by Viktor Petrovich after the
Windows audio fix (PR #426) shipped and confirmed a measurable
GPU drop:

- `full` (default): native frame rate, marquee scrolls normally
- `reduced`: 30 fps cap on the animated seekbar wave; player
  marquee runs at half speed
- `static`: rAF loop disabled; the seekbar repaints from the
  ~2 Hz audio:progress heartbeat. Player title/artist truncate
  with ellipsis instead of scrolling.

Migration in `onRehydrateStorage` maps legacy
`reducedAnimations: true` to `'reduced'`, anything else to
`'full'`. Static is opt-in only.

Settings UI follows the ReplayGain Auto/Track/Album pattern with
a contextual hint that explains what each mode does.

i18n: 5 new keys across 8 locales, 2 legacy keys removed.

* docs(changelog): add #441 3-state animation mode entry

* chore(credits): add #441 to Psychotoxical contributions

src/locales/nl.ts

@@ -912,8 +912,13 @@ export const nlTranslation = {
     sidebarLyricsStyleAppleDesc: 'Actieve regel verankerd bovenaan met vloeiende animatie.',
     seekbarStyle: 'Zoekbalkstijl',
     seekbarStyleDesc: 'Kies het uiterlijk van de afspeelbalk',
-    reducedAnimations: 'Animaties beperken',
-    reducedAnimationsDesc: 'Beperk geanimeerde zoekbalkstijlen tot 30 fps om GPU-gebruik op tragere hardware te verminderen. Visueel verschil is minimaal.',
+    animationMode: 'Animaties',
+    animationModeDesc: 'Wissel visuele soepelheid in voor minder GPU-/CPU-gebruik op tragere hardware.',
+    animationModeFull: 'Volledig',
+    animationModeReduced: 'Gereduceerd',
+    animationModeStatic: 'Statisch',
+    animationModeReducedHint: '30 fps limiet op de zoekbalk-golf; spelertitel scrollt op halve snelheid.',
+    animationModeStaticHint: 'Geen golfanimatie; spelertitel wordt afgekapt in plaats van scrollen.',
     seekbarTruewave: 'Echte golfvorm',
     seekbarPseudowave: 'Pseudo-golfvorm',
     seekbarLinedot: 'Lijn & punt',