style(frontend): '생각하는 중' 자리를 답변 말풍선과 같은 모양으로 — ThinkingBubble

세 군데(새 대화 세션 생성 중 / 스트리밍 첫 토큰 전 / 재진입 대기)가 각자 손으로 그린 테두리 카드라
실제 답변(Message: AI 배지 + CODEASSIST + 상자 없는 본문)과 달랐음. 컴포넌트 하나로 통일.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

2_frontend/tsconfig.tsbuildinfo

@@ -1 +1 @@
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