fix(stats): don't write sentence clip to expression-audio field

- `getStatsDirectMiningAudioFieldNames` now takes a `mode` param; sentence mode skips `ExpressionAudio`
- Update test expectation: `ExpressionAudio` should be `undefined` after sentence mining
- Clarify changelog wording for the audio-field fix
- Reformat `SearchTab.test.ts` assertions (no behavior change)

src/core/services/__tests__/stats-server.test.ts

@@ -1852,7 +1852,7 @@ describe('stats server API routes', () => {
         const updateRequest = requests.find((request) => request.action === 'updateNoteFields');
         const audioValue = updateRequest?.params?.note?.fields?.SentenceAudio;
         assert.match(audioValue ?? '', /^\[sound:subminer_audio_\d+\.mp3\]$/);
-        assert.equal(updateRequest?.params?.note?.fields?.ExpressionAudio, audioValue);
+        assert.equal(updateRequest?.params?.note?.fields?.ExpressionAudio, undefined);
       });
     });
   });

src/core/services/stats-server.ts

@@ -172,6 +172,7 @@ function getStatsWordMiningAudioFieldName(
 function getStatsDirectMiningAudioFieldNames(
   ankiConfig: AnkiConnectConfig,
   noteInfo: StatsServerNoteInfo | null,
+  mode: 'sentence' | 'audio',
 ): string[] {
   const configuredAudioField = ankiConfig.fields?.audio ?? 'ExpressionAudio';
   if (!ankiConfig.isLapis?.enabled && !ankiConfig.isKiku?.enabled) {
@@ -185,6 +186,10 @@ function getStatsDirectMiningAudioFieldNames(
     ? resolveStatsNoteFieldName(noteInfo, configuredAudioField)
     : null;
 
+  if (mode === 'sentence') {
+    return uniqueFieldNames(sentenceAudioField);
+  }
+
   return uniqueFieldNames(sentenceAudioField, expressionAudioField);
 }
 
@@ -1395,7 +1400,7 @@ export function createStatsApp(
           client.storeMediaFile(audioFilename, audioBuffer),
         );
         const audioValue = `[sound:${audioFilename}]`;
-        for (const fieldName of getStatsDirectMiningAudioFieldNames(ankiConfig, noteInfo)) {
+        for (const fieldName of getStatsDirectMiningAudioFieldNames(ankiConfig, noteInfo, mode)) {
           mediaFields[fieldName] = audioValue;
         }
       } catch (err) {