fix(seekbar): split waveform style into truewave (analyzed) + pseudowave (deterministic)

The waveform-loudness-cache merge replaced the existing deterministic
per-track-ID waveform with a bins-based one driven by the analysis
cache. The bins-based variant is the better default but the old
deterministic look is still valuable when no analysis is available
(brand-new track, cache-miss, etc.) and several users prefer it.

Split into two explicit options in the seekbar style picker:

- 'truewave' (default, replaces old 'waveform') — bins from the analysis
  cache, with morph-on-arrival animation and flat-line fallback while
  empty.
- 'pseudowave' — pseudo-random heights derived deterministically from
  the track ID. No analysis dependency, no morph, instant render.

Existing persisted seekbarStyle: 'waveform' is migrated to 'truewave'
in onRehydrateStorage so users keep the visual they have today. The
useEffect that builds heightsRef now lists seekbarStyle in its deps so
switching between the two is live.

i18n labels added in all 8 locales.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/locales/de.ts

@@ -888,7 +888,8 @@ export const deTranslation = {
     sidebarLyricsStyleAppleDesc: 'Aktive Zeile oben mit sanfter Animation.',
     seekbarStyle: 'Seekbar-Stil',
     seekbarStyleDesc: 'Aussehen der Wiedergabe-Seekbar auswählen',
-    seekbarWaveform: 'Wellenform',
+    seekbarTruewave: 'Echte Wellenform',
+    seekbarPseudowave: 'Pseudo-Wellenform',
     seekbarLinedot: 'Linie & Punkt',
     seekbarBar: 'Balken',
     seekbarThick: 'Dicker Balken',

src/locales/en.ts

@@ -894,7 +894,8 @@ export const enTranslation = {
     fsPortraitDim: 'Photo dimming',
     seekbarStyle: 'Seekbar Style',
     seekbarStyleDesc: 'Choose the look of the player seek bar',
-    seekbarWaveform: 'Waveform',
+    seekbarTruewave: 'Truewave',
+    seekbarPseudowave: 'Pseudowave',
     seekbarLinedot: 'Line & Dot',
     seekbarBar: 'Bar',
     seekbarThick: 'Thick Bar',

src/locales/es.ts

@@ -881,7 +881,8 @@ export const esTranslation = {
     sidebarLyricsStyleAppleDesc: 'La línea activa se ancla arriba con animación suave.',
     seekbarStyle: 'Estilo de Barra de Progreso',
     seekbarStyleDesc: 'Elige la apariencia de la barra de progreso del reproductor',
-    seekbarWaveform: 'Forma de Onda',
+    seekbarTruewave: 'Forma de Onda Real',
+    seekbarPseudowave: 'Forma de Onda Pseudo',
     seekbarLinedot: 'Línea y Punto',
     seekbarBar: 'Barra',
     seekbarThick: 'Barra Gruesa',

src/locales/fr.ts

@@ -876,7 +876,8 @@ export const frTranslation = {
     sidebarLyricsStyleAppleDesc: "La ligne active reste en haut avec une animation fluide.",
     seekbarStyle: 'Style de la barre de lecture',
     seekbarStyleDesc: 'Choisir l\'apparence de la barre de progression',
-    seekbarWaveform: 'Forme d\'onde',
+    seekbarTruewave: 'Forme d\'onde réelle',
+    seekbarPseudowave: 'Forme d\'onde pseudo',
     seekbarLinedot: 'Ligne & point',
     seekbarBar: 'Barre',
     seekbarThick: 'Barre épaisse',

src/locales/nb.ts

@@ -875,7 +875,8 @@ export const nbTranslation = {
     sidebarLyricsStyleAppleDesc: 'Aktiv linje forankres øverst med jevn animasjon.',
     seekbarStyle: 'Søkefelt-stil',
     seekbarStyleDesc: 'Velg utseendet på avspillingssøkefeltet',
-    seekbarWaveform: 'Bølgeform',
+    seekbarTruewave: 'Ekte bølgeform',
+    seekbarPseudowave: 'Pseudo-bølgeform',
     seekbarLinedot: 'Linje & punkt',
     seekbarBar: 'Linje',
     seekbarThick: 'Tykk linje',

src/locales/nl.ts

@@ -875,7 +875,8 @@ export const nlTranslation = {
     sidebarLyricsStyleAppleDesc: 'Actieve regel verankerd bovenaan met vloeiende animatie.',
     seekbarStyle: 'Zoekbalkstijl',
     seekbarStyleDesc: 'Kies het uiterlijk van de afspeelbalk',
-    seekbarWaveform: 'Golfvorm',
+    seekbarTruewave: 'Echte golfvorm',
+    seekbarPseudowave: 'Pseudo-golfvorm',
     seekbarLinedot: 'Lijn & punt',
     seekbarBar: 'Balk',
     seekbarThick: 'Dikke balk',

src/locales/ru.ts

@@ -927,7 +927,8 @@ export const ruTranslation = {
     sidebarLyricsStyleAppleDesc: 'Активная строка фиксируется сверху с плавной анимацией.',
     seekbarStyle: 'Стиль прогресс-бара',
     seekbarStyleDesc: 'Выбор внешнего вида полосы воспроизведения',
-    seekbarWaveform: 'Форма волны',
+    seekbarTruewave: 'Реальная форма волны',
+    seekbarPseudowave: 'Псевдо форма волны',
     seekbarLinedot: 'Линия и точка',
     seekbarBar: 'Полоса',
     seekbarThick: 'Толстая полоса',

src/locales/zh.ts

@@ -870,7 +870,8 @@ export const zhTranslation = {
     sidebarLyricsStyleAppleDesc: '活动行固定在顶部，带有平滑弹簧动画。',
     seekbarStyle: '进度条样式',
     seekbarStyleDesc: '选择播放进度条的外观',
-    seekbarWaveform: '波形',
+    seekbarTruewave: '真实波形',
+    seekbarPseudowave: '伪波形',
     seekbarLinedot: '线条与点',
     seekbarBar: '条形',
     seekbarThick: '粗条形',