[samkelly-dev]

Closes #942

Summary of Changes
Blocked Escape & Backdrop Close During Submission:
Updated the Escape keydown event listener and backdrop click handler in BlacklistBulkRemoveConfirm.tsx to prevent onClose() calls while isSubmitting is in-flight. If onConfirm fails, the dialog stays open and the error message alert is visible to the user.
Focus Management & Tab Trap:
Added a Tab and Shift+Tab focus trap cycling through all interactive/focusable elements within the dialog.
Preserved document.activeElement when the dialog opens and restored focus to the opener element when the dialog closes.
onUndo Prop Contract & Error Handling:
Added onUndo?: (entries: BlacklistEntry[]) => Promise | void; to BlacklistBulkRemoveConfirmProps.
Only registered the Undo banner action via registerUndo when onUndo is provided.
Wrapped onUndo(entries) in a try/catch block that surfaces errors via setSubmitError if undoing fails.
Comprehensive Test Coverage:
Added tests in BlacklistBulkRemoveConfirm.test.tsx verifying:
Escape key and backdrop clicks are ignored during pending confirm.
A failed confirm displays the error in the open dialog.
Focus is trapped within the dialog on Tab / Shift+Tab.
Focus returns to the trigger button when the dialog closes.
onUndo is called with the removed entries when Undo is clicked.
Undo banner is only registered when onUndo is provided.
Errors thrown by onUndo are caught and displayed.

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