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

src/settings/settings-model.ts

@@ -38,7 +38,7 @@ export function filterSettingsFields(
   filter: SettingsFilter,
 ): ConfigSettingsField[] {
   const query = normalizeQuery(filter.query);
-  const terms = query.length > 0 ? query.split(/\s+/) : [];
+  const terms = query.length > 0 ? searchableText([query]).split(/\s+/).filter(Boolean) : [];
   return fields.filter((field) => {
     if (field.legacyHidden || field.settingsHidden) {
       return false;
@@ -46,7 +46,7 @@ export function filterSettingsFields(
     if (filter.category && field.category !== filter.category) {
       return false;
     }
-    if (!query) {
+    if (!query || terms.length === 0) {
       return true;
     }
     const haystack = searchableText([