migrate subtitle style config to CSS declaration shape

- Flat style keys (fontFamily, fontSize, hoverTokenColor, etc.) consolidated into subtitleStyle.css, secondary.css, and subtitleSidebar.css objects
- Hover token colors migrated to --subtitle-hover-token-color CSS custom properties
- Plugin app-ping now checks result.status (0=running, 1=stopped) to avoid treating transient failures as stopped
- Note-fields note type picker defaults to configured deck's note type before falling back to Kiku/Lapis
- New migration for legacy ankiConnect N+1 config paths

src/config/resolve/subtitle-domains.ts

@@ -25,6 +25,23 @@ function asCssDeclarations(value: unknown): Record<string, string> | undefined {
   return declarations;
 }
 
+const SUBTITLE_HOVER_TOKEN_COLOR_CSS_PROPERTY = '--subtitle-hover-token-color';
+const SUBTITLE_HOVER_TOKEN_BACKGROUND_CSS_PROPERTY = '--subtitle-hover-token-background-color';
+
+function applySubtitleHoverTokenCssCompatibility(
+  subtitleStyle: ResolvedConfig['subtitleStyle'],
+): void {
+  const hoverTokenColor = subtitleStyle.css[SUBTITLE_HOVER_TOKEN_COLOR_CSS_PROPERTY];
+  if (hoverTokenColor !== undefined) {
+    subtitleStyle.hoverTokenColor = hoverTokenColor;
+  }
+
+  const hoverTokenBackgroundColor = subtitleStyle.css[SUBTITLE_HOVER_TOKEN_BACKGROUND_CSS_PROPERTY];
+  if (hoverTokenBackgroundColor !== undefined) {
+    subtitleStyle.hoverTokenBackgroundColor = hoverTokenBackgroundColor;
+  }
+}
+
 export function applySubtitleDomainConfig(context: ResolveContext): void {
   const { src, resolved, warn } = context;
 
@@ -349,6 +366,8 @@ export function applySubtitleDomainConfig(context: ResolveContext): void {
       );
     }
 
+    applySubtitleHoverTokenCssCompatibility(resolved.subtitleStyle);
+
     const nameMatchColor = asColor(
       (src.subtitleStyle as { nameMatchColor?: unknown }).nameMatchColor,
     );