fix(waveform): stabilize progressive rendering and reduce streaming contention

Improve seekbar fallback behavior by using consistent bar-based rendering and smoother transitions to analyzed waveform data. Reduce hot-path analysis overhead during ranged streaming and add controls to clear cached waveform entries.

src/locales/en.ts

@@ -656,9 +656,12 @@ export const enTranslation = {
     hotCacheTrackCount: 'Tracks in cache:',
     cacheMaxLabel: 'Max. size',
     cacheClearBtn: 'Clear Cache',
+    waveformCacheClearBtn: 'Clear waveform cache',
     cacheClearWarning: 'This will also remove all offline albums from the library.',
     cacheClearConfirm: 'Clear Everything',
     cacheClearCancel: 'Cancel',
+    waveformCacheCleared: 'Waveform cache cleared ({{count}} rows).',
+    waveformCacheClearFailed: 'Failed to clear waveform cache.',
     offlineDirTitle: 'Offline Library (In-App)',
     offlineDirDesc: 'Storage location for tracks you make available offline within Psysonic.',
     offlineDirDefault: 'Default (App Data)',