Replace grammar-ending permutations with shared matcher; preserve word a

- Extract `grammar-ending.ts` with `isStandaloneGrammarEndingText` / `isSubtitleGrammarEndingText` pattern matchers
- Replace `STANDALONE_GRAMMAR_ENDINGS` set in parser-selection-stage with shared matcher
- Replace generated phrase sets in subtitle-annotation-filter with shared matcher
- Remove stale duplicate subtitle-exclusion constants and helpers from annotation-stage
- Manual clipboard card updates now write only to the sentence audio field, leaving word/expression audio untouched

docs-site/anki-integration.md

@@ -213,7 +213,7 @@ Animated AVIF requires an AV1 encoder (`libaom-av1`, `libsvtav1`, or `librav1e`)
 }
 ```
 
-`overwriteAudio` applies to automatic card updates and duplicate-card enrichment. Manual clipboard subtitle updates (`Ctrl/Cmd+C`, then `Ctrl/Cmd+V`) always replace generated audio in both the expression audio field and sentence audio field.
+`overwriteAudio` applies to automatic card updates and duplicate-card enrichment. Manual clipboard subtitle updates (`Ctrl/Cmd+C`, then `Ctrl/Cmd+V`) always replace generated sentence audio, while leaving the word audio field unchanged.
 
 ## AI Translation
 

docs-site/configuration.md

@@ -893,7 +893,7 @@ This example is intentionally compact. The option table below documents availabl
 | `media.audioPadding`                              | number (seconds)                        | Padding around audio clip timing (default: `0.5`)                                                                                                                                          |
 | `media.fallbackDuration`                          | number (seconds)                        | Default duration if timing unavailable (default: `3.0`)                                                                                                                                    |
 | `media.maxMediaDuration`                          | number (seconds)                        | Max duration for generated media from multi-line copy (default: `30`, `0` to disable)                                                                                                      |
-| `behavior.overwriteAudio`                         | `true`, `false`                         | Replace existing audio on updates; when `false`, new audio is appended/prepended per `behavior.mediaInsertMode`; manual clipboard updates always replace generated audio (default: `true`) |
+| `behavior.overwriteAudio`                         | `true`, `false`                         | Replace existing audio on updates; when `false`, new audio is appended/prepended per `behavior.mediaInsertMode`; manual clipboard updates always replace generated sentence audio (default: `true`) |
 | `behavior.overwriteImage`                         | `true`, `false`                         | Replace existing images on updates; when `false`, new images are appended/prepended per `behavior.mediaInsertMode` (default: `true`)                                                       |
 | `behavior.mediaInsertMode`                        | `"append"`, `"prepend"`                 | Where to insert new media when overwrite is off (default: `"append"`)                                                                                                                      |
 | `behavior.highlightWord`                          | `true`, `false`                         | Highlight the word in sentence context (default: `true`)                                                                                                                                   |

docs-site/mining-workflow.md

@@ -100,7 +100,7 @@ If you prefer a hands-on approach (animecards-style), you can copy the current s
    - For multiple lines: press `Ctrl/Cmd+Shift+C`, then a digit `1`–`9` to select how many recent subtitle lines to combine. The combined text is copied to the clipboard.
 3. Press `Ctrl/Cmd+V` to update the last-added card with the clipboard contents plus audio, image, and translation — the same fields auto-update would fill.
 
-Manual clipboard updates always replace generated audio in both the expression audio field and sentence audio field, even when `ankiConnect.behavior.overwriteAudio` is disabled. The manual flow assumes you are intentionally replacing the proxy-generated clip on the newest card.
+Manual clipboard updates always replace generated sentence audio, even when `ankiConnect.behavior.overwriteAudio` is disabled. The word audio field is left unchanged because the word itself does not change in this flow.
 
 This is useful when auto-update is disabled or when you want explicit control over which subtitle line gets attached to the card.