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Task 19 of the slice plan. Frameless dark card with: - placeholder "지금 머릿속에 있는 것 한 줄. 정리는 나중입니다." - hint "Ctrl+Enter 구출 · Esc 취소 · 이미지 붙여넣기" - Ctrl/Cmd+Enter to submit (window.inkling.capture.submit then hide), Esc to cancel (with "이 한 줄을 흘려보낼까요?" confirm when text > 5 chars) - clipboard image paste -> thumbnail strip with ArrayBuffer retained for submit - fallback "저장에 실패했습니다. 다시 시도해주세요." in-card on IPC error (window stays open with content preserved) api.ts wraps window.inkling.capture as the typed CaptureApi. main.tsx mounts <App /> on #root. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>