fix: consume confirmation dialog key events

[kaluli123123]

Summary

• consume the full Enter key sequence in the confirmation dialog to prevent the macOS unhandled-key alert sound
• keep confirmation on key up and consume repeats without triggering duplicate actions
• preserve Escape-to-dismiss behavior
• cover handled Enter key down/up events and single confirmation

Closes #7342

Validation

• flutter test --no-pub test/widget_test/confirm_dialog_test.dart — 1 test passed
• flutter analyze --no-pub . — no issues found
• Dart formatting and git diff --check pass

Validated with Flutter 3.27.4 on macOS arm64. The system alert sound itself was not exercised in a packaged app.

[sourcery-ai]

Reviewer's Guide

Updates the confirmation dialog’s keyboard event handling to use Focus and explicitly consume Escape and Enter events, preventing unhandled-key system alert sounds while preserving existing actions and close semantics.

Sequence diagram for confirmation dialog key handling

sequenceDiagram
    actor User
    participant Dialog as ConfirmPopup
    participant Navigator

    User->>Dialog: Escape KeyDownEvent
    Dialog->>Dialog: _handleKeyEvent(node, event)
    Dialog->>Navigator: pop()
    Dialog-->>User: KeyEventResult.handled

    User->>Dialog: Enter KeyUpEvent
    Dialog->>Dialog: _handleKeyEvent(node, event)
    Dialog->>Dialog: onConfirm(context)
    opt closeOnAction
        Dialog->>Navigator: pop()
    end
    Dialog-->>User: KeyEventResult.handled

Loading

File-Level Changes

Change	Details	Files
Route confirmation-dialog keyboard handling through a Focus widget that explicitly reports whether each event was handled.	Replace KeyboardListener with Focus and a dedicated key-event handler. Preserve Escape-to-dismiss and Enter-to-confirm behavior, including conditional close behavior. Return handled for consumed Escape and Enter events, and ignored for disabled or unrelated events.	frontend/appflowy_flutter/lib/workspace/presentation/home/menu/sidebar/space/shared_widget.dart

Assessment against linked issues

Issue	Objective	Addressed	Explanation
#7342	Prevent the macOS system alert sound when pressing Enter to confirm document deletion in the confirmation dialog.	✅
#7342	Continue handling Enter and Escape keyboard actions in the confirmation dialog while marking the relevant events as handled so they are not propagated as unhandled key events.	✅

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