feat(anki): add media timing review before card creation

- Add draggable timing previews with audio playback and exact media ranges
- Support cancellation choices, including deleting existing cards

docs-site/anki-integration.md

@@ -166,6 +166,7 @@ Audio is extracted from the video file using the subtitle's start and end timest
     "generateAudio": true,
     "normalizeAudio": true,      // normalize generated clip loudness
     "mirrorMpvVolume": true,     // apply the current mpv volume level
+    "reviewTiming": false,       // review and adjust timing before media generation
     "audioPadding": 0,           // optional seconds before and after subtitle timing
     "maxMediaDuration": 30       // cap total duration in seconds
   }
@@ -178,6 +179,10 @@ Output format: MP3 at 44100 Hz. If the video has multiple audio streams, SubMine
 
 The audio is uploaded to Anki's media folder and inserted as `[sound:audio_<timestamp>.mp3]`.
 
+Set `media.reviewTiming` to `true` to pause playback and review each word, sentence, or audio card before its media is generated. The review opens with the subtitle range plus configured audio padding, provides draggable start and end handles, 100 ms adjustments, audio preview, and controls to reveal another five seconds before or after the visible timeline. The confirmed range is exact: SubMiner does not apply audio padding a second time. Static screenshots use its midpoint, and animated AVIF clips use the full confirmed range.
+
+Canceling the review lets you keep editing, finish with the original timing, or discard the card. Discard deletes an existing Yomitan or audio card and skips creation for a direct sentence card. Clipboard updates and stats-dashboard mining do not open timing review. Audio preview failure does not block confirmation or card creation. The option is disabled by default and hot-reloads.
+
 ### Screenshots (Static)
 
 A single frame is captured at the current playback position.