c590146be01b5b129f1e00db32ac9d1cea3545ea
- TopBar: call closeBoard() before navigating back to prevent data loss - board-store: guard debouncedSave against race condition when board is closed during an in-flight save - board-store: add missing updatedAt to setColumnWidth - useKeyboardShortcuts: remove duplicate Ctrl+K handler that prevented command palette from toggling closed - AttachmentSection: wire up Tauri file dialog for adding attachments with link/copy mode support
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