fix(recall): PR review round 1 — i1 race + m1~m4 + n2 (#6 v0.2.3)

- i1 (Important): RecallBanner shownIds → useRef (state setState 트리거 race 차단)
  store 의 recallShownIds 필드 제거 (dead — useRef 가 대체)
- m1 (Minor): snoozeRecall candidate-null race 코멘트 (의도적 emit skip 명시)
- m2 (Minor): dismissRecallNote 후 recallSnoozeUntilMs = null clear
- m3 (Minor): CaptureService.markRecallOpened 의 dead local 'before' inline check 로 제거
- m4 (Minor): RecallBanner title 빈 케이스 fallback '(제목 없음)'
- n2 (Nit): NoteCard id load-bearing 의미 1줄 코멘트

skip: n1 (KST 4번째 inline duplicate — 프로젝트 전반 패턴, v0.2.4 nextKstMidnightMs 통합),
      n3 (ipcMain.on vs handle — 다른 IPC 와 패턴 일관)

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/renderer/inbox/components/NoteCard.tsx

@@ -184,6 +184,7 @@ export function NoteCard({ note, onDeleted, onUpdated, mode = 'inbox', onRestore
   const showIntentBanner = local.aiStatus === 'done' && local.intentPromptedAt === null;
 
   return (
+    // id load-bearing — RecallBanner 의 scrollIntoView target (#6 v0.2.3)
     <div id={`note-${note.id}`} style={{ background: 'white', padding: 16, marginBottom: 12, borderRadius: 10, boxShadow: '0 1px 2px rgba(0,0,0,0.04)' }}>
       <div style={{ fontSize: 11, color: '#888' }}>{formatted}</div>