feat: adaptive bitrate support, engine improvements, demo updates, and electron preload

src/components/AccessibilitySettings.vue

@@ -12,6 +12,15 @@ const emit = defineEmits<{
 const fontSizeOptions = [20, 24, 28, 32]
 const bgAlphaOptions = [0, 0.3, 0.5, 0.7, 0.9]
 
+const qualityOptions = [
+  { key: '', label: '自动' },
+  { key: '超清 (1080P)', label: '超清 (1080P)', speed: '需要 2.5 Mbps' },
+  { key: '高清 (720P)', label: '高清 (720P)', speed: '需要 2 Mbps' },
+  { key: '标清 (480P)', label: '标清 (480P)', speed: '需要 0.8 Mbps' },
+]
+
+const isWeb = typeof window !== 'undefined' && !(window as any).__ELECTRON__
+
 const langLabels: Record<string, string> = {
   zh: '中文',
   en: 'English',
@@ -39,6 +48,15 @@ const langLabels: Record<string, string> = {
           </select>
         </div>
 
+        <div class="setting-row" v-if="isWeb">
+          <span class="setting-label">画质</span>
+          <select :value="store.preferredQuality" @change="store.setPreferredQuality(($event.target as HTMLSelectElement).value)">
+            <option v-for="q in qualityOptions" :key="q.key" :value="q.key">
+              {{ q.label }}{{ q.speed ? '（' + q.speed + '）' : '' }}
+            </option>
+          </select>
+        </div>
+
         <div class="setting-row">
           <span class="setting-label">{{ t('ui.subtitleSize') }}</span>
           <select :value="store.subFontSize" @change="store.setSubFontSize(+($event.target as HTMLSelectElement).value)">