bring over relevant desktop settings

src/lyrics/displaySettings.test.mts

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+import assert from 'node:assert/strict';
+import test from 'node:test';
+import {
+  DEFAULT_LYRICS_DISPLAY_SETTINGS,
+  normalizeLyricsDisplaySettings,
+  normalizeLyricsLanguagePriority,
+} from './displaySettings.ts';
+
+test('lyrics display settings default safely for upgraded installs', () => {
+  assert.deepEqual(normalizeLyricsDisplaySettings(null), DEFAULT_LYRICS_DISPLAY_SETTINGS);
+  assert.deepEqual(normalizeLyricsDisplaySettings({}), DEFAULT_LYRICS_DISPLAY_SETTINGS);
+});
+
+test('lyrics display settings preserve explicit disabled layers and voice labels', () => {
+  assert.deepEqual(normalizeLyricsDisplaySettings({
+    wordTimingEnabled: false,
+    furiganaEnabled: false,
+    translationsEnabled: false,
+    translationPriority: ['fr'],
+    voiceLabelsEnabled: true,
+  }), {
+    wordTimingEnabled: false,
+    furiganaEnabled: false,
+    translationsEnabled: false,
+    translationPriority: ['fr'],
+    voiceLabelsEnabled: true,
+  });
+});
+
+test('language priority trims, deduplicates case-insensitively, and restores defaults when empty', () => {
+  assert.deepEqual(normalizeLyricsLanguagePriority(' en, ja-Latn, EN, fr , '), ['en', 'ja-Latn', 'fr']);
+  assert.deepEqual(normalizeLyricsLanguagePriority(' , '), ['en', 'ja-Latn']);
+});

src/lyrics/displaySettings.ts

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+export const DEFAULT_LYRICS_LANGUAGE_PRIORITY = ['en', 'ja-Latn'] as const;
+
+export interface LyricsDisplaySettings {
+  wordTimingEnabled: boolean;
+  furiganaEnabled: boolean;
+  translationsEnabled: boolean;
+  translationPriority: string[];
+  voiceLabelsEnabled: boolean;
+}
+
+export const DEFAULT_LYRICS_DISPLAY_SETTINGS: LyricsDisplaySettings = {
+  wordTimingEnabled: true,
+  furiganaEnabled: true,
+  translationsEnabled: true,
+  translationPriority: [...DEFAULT_LYRICS_LANGUAGE_PRIORITY],
+  voiceLabelsEnabled: false,
+};
+
+export function normalizeLyricsLanguagePriority(value: unknown): string[] {
+  const entries = Array.isArray(value)
+    ? value
+    : typeof value === 'string'
+      ? value.split(',')
+      : [];
+  const seen = new Set<string>();
+  const normalized: string[] = [];
+  for (const entry of entries) {
+    if (typeof entry !== 'string') continue;
+    const trimmed = entry.trim();
+    if (!trimmed) continue;
+    const key = trimmed.toLocaleLowerCase();
+    if (seen.has(key)) continue;
+    seen.add(key);
+    normalized.push(trimmed);
+  }
+  return normalized.length > 0 ? normalized : [...DEFAULT_LYRICS_LANGUAGE_PRIORITY];
+}
+
+export function normalizeLyricsDisplaySettings(value: unknown): LyricsDisplaySettings {
+  const candidate = value && typeof value === 'object' && !Array.isArray(value)
+    ? value as Partial<LyricsDisplaySettings>
+    : {};
+  return {
+    wordTimingEnabled: candidate.wordTimingEnabled !== false,
+    furiganaEnabled: candidate.furiganaEnabled !== false,
+    translationsEnabled: candidate.translationsEnabled !== false,
+    translationPriority: normalizeLyricsLanguagePriority(candidate.translationPriority),
+    voiceLabelsEnabled: candidate.voiceLabelsEnabled === true,
+  };
+}