feat(config): unify mpv plugin options under main config and add CSS/Ani

- Replace subminer.conf plugin config with mpv.* fields in config.jsonc
- Add socketPath, backend, autoStartSubMiner, pauseUntilOverlayReady, aniskipEnabled/buttonKey, subminerBinaryPath to mpv config
- Add subtitleSidebar.css field; migrate legacy sidebar appearance fields
- Add paintOrder and WebkitTextStroke to subtitle style options
- Update default subtitle/sidebar fontFamily to CJK-first stack
- Fix overlay visible state surviving mpv y-r restart
- Fix live config saves applying subtitle CSS immediately to open overlays
- Migrate legacy primary/secondary subtitle appearance into subtitleStyle.css on load
- Switch AniSkip button key setting to click-to-learn key capture

launcher/commands/playback-command.ts

@@ -7,7 +7,6 @@ import { collectVideos, showFzfMenu, showRofiMenu } from '../picker.js';
 import {
   cleanupPlaybackSession,
   launchAppCommandDetached,
-  markOverlayManagedByLauncher,
   resolveLauncherRuntimePluginPath,
   startMpv,
   startOverlay,
@@ -238,6 +237,11 @@ export async function runPlaybackCommandWithDeps(
       startPaused: shouldPauseUntilOverlayReady || isAppOwnedYoutubeFlow,
       disableYoutubeSubtitleAutoLoad: isAppOwnedYoutubeFlow,
       runtimePluginPath: resolveLauncherRuntimePluginPath({ appPath, scriptPath }),
+      runtimePluginConfig: {
+        ...pluginRuntimeConfig,
+        backend: args.backend,
+        texthookerEnabled: args.useTexthooker && pluginRuntimeConfig.texthookerEnabled,
+      },
     },
   );
 
@@ -263,7 +267,6 @@ export async function runPlaybackCommandWithDeps(
         : [],
     );
   } else if (pluginAutoStartEnabled) {
-    markOverlayManagedByLauncher(appPath);
     if (ready) {
       deps.log('info', args.logLevel, 'MPV IPC socket ready, relying on mpv plugin auto-start');
     } else {