fix(anki): regenerate sentence furigana when mined context changes

- Regenerate SentenceFurigana from the final sentence after timing-review expansion or stats-dashboard word mining
- Add a Yomitan parseText-based generator with a 10s timeout and escaped, highlighted output
- Clear stale furigana on failure so templates fall back to Sentence
- Keep existing furigana formatting when the sentence is unchanged
- Document the behavior in the anki-integration and immersion-tracking docs

docs-site/anki-integration.md

@@ -222,6 +222,8 @@ Confirming writes the combined lines to the sentence field. Reset drops the adde
 
 **Canceling.** You can go back to editing, finish with the original timing, create the card without audio or an image, or discard it. Discard deletes an existing Yomitan or audio card, and skips creation entirely for a direct sentence card. A failed audio preview does not block confirmation or card creation.
 
+When word-card enrichment changes the sentence context, including an expanded timing-review selection, SubMiner regenerates `SentenceFurigana` from the final sentence. Unchanged sentences keep their existing furigana formatting. If generation fails, SubMiner clears stale furigana so compatible templates can fall back to `Sentence`.
+
 Clipboard updates and stats-dashboard mining never open timing review. The option is off by default and hot-reloads. **Review Media Timing** in the runtime options palette (`Ctrl/Cmd+Shift+O`) toggles it for the current session.
 
 If SubMiner closes the overlay while a timing review is still loading, it cancels pending setup and modal retries and restores playback if the review paused it. A new timing review can start after the overlay reopens.

docs-site/immersion-tracking.md

@@ -152,7 +152,7 @@ Stats server config lives under `stats`:
 
 The Search tab and the Vocabulary tab's word detail panel both mine from subtitle lines in your viewing history. Search matches sentence text and media titles, and **Search by headword** is enabled by default so dictionary-form searches such as `知らない` can find tracked subtitle lines with inflected variants. Turn that toggle off for exact text/title matching only. Each line with a valid source file offers sentence-card mining; word/audio mining is available when the selected word or searched word appears in the sentence:
 
-- **Mine Word** - looks up the word with the selected dictionary backend, Yomitan or Hachidori, then enriches the card with sentence audio, a screenshot or animated AVIF clip, the highlighted sentence, and metadata extracted from the source video file. The selected history line supplies the card's context even while another subtitle is playing in mpv. Hachidori uses its configured Anki template, dictionary aliases, and frequency metadata. Requires Anki and the selected backend's dictionaries to be loaded.
+- **Mine Word** - looks up the word with the selected dictionary backend, Yomitan or Hachidori, then enriches the card with sentence audio, a screenshot or animated AVIF clip, the highlighted sentence, full-sentence readings in `SentenceFurigana` when that field exists, and metadata extracted from the source video file. The selected history line supplies the card's context even while another subtitle is playing in mpv. Hachidori uses its configured Anki template, dictionary aliases, and frequency metadata. Requires Anki and the selected backend's dictionaries to be loaded.
 - **Mine Sentence** - creates a sentence card directly with the `IsSentenceCard` flag set (for Lapis/Kiku workflows), along with audio and image from the source video.
 - **Mine Audio** - creates an audio-only card with the `IsAudioCard` flag, attaching only the sentence audio clip.