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/config/mpv-config.ts

@@ -1,6 +1,29 @@
 import { parseMpvLaunchMode } from '../../src/shared/mpv-launch-mode.js';
+import type { Backend } from '../types.js';
 import type { LauncherMpvConfig } from '../types.js';
 
+function parseBackend(value: unknown): Backend | undefined {
+  if (typeof value !== 'string') return undefined;
+  const normalized = value.trim().toLowerCase();
+  if (
+    normalized === 'auto' ||
+    normalized === 'hyprland' ||
+    normalized === 'sway' ||
+    normalized === 'x11' ||
+    normalized === 'macos' ||
+    normalized === 'windows'
+  ) {
+    return normalized;
+  }
+  return undefined;
+}
+
+function parseNonEmptyString(value: unknown): string | undefined {
+  if (typeof value !== 'string') return undefined;
+  const trimmed = value.trim();
+  return trimmed.length > 0 ? trimmed : undefined;
+}
+
 export function parseLauncherMpvConfig(root: Record<string, unknown>): LauncherMpvConfig {
   const mpvRaw = root.mpv;
   if (!mpvRaw || typeof mpvRaw !== 'object') return {};
@@ -8,5 +31,15 @@ export function parseLauncherMpvConfig(root: Record<string, unknown>): LauncherM
 
   return {
     launchMode: parseMpvLaunchMode(mpv.launchMode),
+    socketPath: parseNonEmptyString(mpv.socketPath),
+    backend: parseBackend(mpv.backend),
+    autoStartSubMiner:
+      typeof mpv.autoStartSubMiner === 'boolean' ? mpv.autoStartSubMiner : undefined,
+    pauseUntilOverlayReady:
+      typeof mpv.pauseUntilOverlayReady === 'boolean' ? mpv.pauseUntilOverlayReady : undefined,
+    subminerBinaryPath:
+      typeof mpv.subminerBinaryPath === 'string' ? mpv.subminerBinaryPath.trim() : undefined,
+    aniskipEnabled: typeof mpv.aniskipEnabled === 'boolean' ? mpv.aniskipEnabled : undefined,
+    aniskipButtonKey: parseNonEmptyString(mpv.aniskipButtonKey),
   };
 }