fix: Kiku field grouping, frequency particles, sidebar media, Yomitan po

- Fix Kiku duplicate-card field grouping: local dupes trigger manual modal or auto-merge; fix modal-open ack race; fix merged field ordering, sentence-audio, furigana, and tag semantics
- Fix frequency annotations for single-token Yomitan compounds with internal particles (e.g. 目の前); keep pure grammar/kana spans unannotated
- Fix subtitle sidebar mining: use audio/image from clicked sidebar line, not current primary line
- Add `subtitleStyle.primaryVisibleOnYomitanPopup` to keep hover-mode primary subtitle visible while Yomitan popup is open
- Normalize trailing commas in config.example.jsonc

src/config/definitions/defaults-subtitle.ts

@@ -8,6 +8,7 @@ export const SUBTITLE_DEFAULT_CONFIG: Pick<ResolvedConfig, 'subtitleStyle' | 'su
     preserveLineBreaks: false,
     autoPauseVideoOnHover: true,
     autoPauseVideoOnYomitanPopup: true,
+    primaryVisibleOnYomitanPopup: true,
     hoverTokenColor: '#f4dbd6',
     hoverTokenBackgroundColor: 'transparent',
     nameMatchEnabled: false,