Escape inside a dialog also cancels the editor interaction #11020

Pressing Escape inside an open dialog in <Tldraw> closes the dialog, but the same keypress also reaches the editor and cancels the current interaction: the selection is cleared, or the active tool exits. Expected: Escape only closes the dialog, the way it already does for menus.

Repro

1. In the examples app, select a shape.
2. Press cmd+alt+/ (ctrl+alt+/ on Windows) to open the keyboard shortcuts dialog.
3. Press Escape.
4. The dialog closes and the shape is deselected.

tldraw.com doesn't seem to be affected, because its dialogs render outside the editor container. Same family as #11021: the editor's open-menu checks don't count dialogs.

Confidence: 85%, ready to get started.