fix:회의록 화자 텍스트에서 __ 노이즈 문자 제거

- GoogleCloudService: STT 결과에서 언더스코어만으로 구성된 단어 필터링
- 프론트엔드: 기존 저장된 데이터 표시 시에도 언더스코어 제거

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

app/Services/GoogleCloudService.php

@@ -442,6 +442,12 @@ private function parseDiarizationResult(array $operationResult): ?array
             $startMs = $this->parseGoogleTimeToMs($word['startTime'] ?? '0s');
             $endMs = $this->parseGoogleTimeToMs($word['endTime'] ?? '0s');
 
+            // 언더스코어만으로 구성된 노이즈 단어 제거
+            $cleanWord = preg_replace('/^_+$/', '', $wordText);
+            if ($cleanWord === '') {
+                continue;
+            }
+
             if ($speakerTag !== $currentSpeaker && $currentSpeaker !== null && ! empty($currentWords)) {
                 $segments[] = [
                     'speaker_name' => '화자 ' . $currentSpeaker,
@@ -456,7 +462,7 @@ private function parseDiarizationResult(array $operationResult): ?array
             }
 
             $currentSpeaker = $speakerTag;
-            $currentWords[] = $wordText;
+            $currentWords[] = $cleanWord;
         }
 
         // 마지막 세그먼트

resources/views/juil/meeting-minutes.blade.php

@@ -796,7 +796,7 @@ function ConversationView({ segments, interimText, isRecording, currentSpeaker,
                             )}
                         </div>
                         <div className="text-sm text-gray-800 leading-relaxed">
-                            {group.texts.map((t, ti) => <span key={ti}>{ti > 0 ? ' ' : ''}{t.text}</span>)}
+                            {group.texts.map((t, ti) => <span key={ti}>{ti > 0 ? ' ' : ''}{t.text.replace(/_+/g, '')}</span>)}
                         </div>
                     </div>
                 );