After finishing an inline tab title edit (via keybind or double-click),
`TabTitleEditor.finishEditing()` calls `makeFirstResponder(nil)` to
clear focus from the text field, leaving the window itself as first
responder. No code path restores focus to the terminal surface, so all
keyboard input is lost until the user clicks into a pane.
Add a `tabTitleEditorDidFinishEditing` delegate callback that fires
after every edit (commit or cancel). TerminalWindow implements it by
calling `makeFirstResponder(focusedSurface)` to hand focus back to the
terminal.
Fixes https://github.com/ghostty-org/ghostty/discussions/11315
Co-Authored-By: Claude <noreply@anthropic.com>
