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/renderer/modals/subtitle-sidebar.ts

@@ -55,6 +55,24 @@ function formatCueTimestamp(seconds: number): string {
   return `${String(mins).padStart(2, '0')}:${String(secs).padStart(2, '0')}`;
 }
 
+function applySidebarCssDeclarations(
+  target: HTMLElement,
+  declarations: Record<string, string>,
+): void {
+  const targetStyle = (target as HTMLElement & { style?: CSSStyleDeclaration }).style;
+  if (!targetStyle) return;
+  for (const [property, rawValue] of Object.entries(declarations)) {
+    const value = rawValue.trim();
+    if (value.length === 0) continue;
+    if (property.includes('-')) {
+      targetStyle.setProperty(property, value);
+      continue;
+    }
+    const styleTarget = targetStyle as unknown as Record<string, string>;
+    styleTarget[property] = value;
+  }
+}
+
 export function findActiveSubtitleCueIndex(
   cues: SubtitleCue[],
   current: { text: string; startTime?: number | null } | null,
@@ -266,6 +284,7 @@ export function createSubtitleSidebarModal(
       '--subtitle-sidebar-hover-background-color',
       snapshot.config.hoverLineBackgroundColor,
     );
+    applySidebarCssDeclarations(ctx.dom.subtitleSidebarContent, snapshot.config.css ?? {});
   }
 
   function seekToCue(cue: SubtitleCue): void {