* gui: Enter confirms Rename Workspace and Create Worktree

Both alert dialogs set a default response, but their EntryRows left
activates-default off, so Enter in the field was swallowed and the user
had to reach for the button. Turn it on for the name, path and branch
rows; a disabled response still ignores Enter.

* gui: wait for the dialog to be mapped before pressing Enter in tests

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Co-authored-by: Grok Bot <grok-bot@users.noreply.github.com>