Implement and test expected macOS/browser keyboard shortcuts consistently across browser chrome and focused editable controls.
Acceptance criteria:
- Cmd+L focuses the address bar and selects the current URL.
- Cmd+R reloads the current page without inserting text into the page or address bar.
- Cmd+[ and Cmd+] navigate backward and forward through browser history.
- Cmd+A, Cmd+C, Cmd+X, and Cmd+V work in the address bar and focused text inputs/textarea controls.
- Command/Option movement and deletion behavior follows macOS single-line text editing conventions where supported.
- Shortcuts are covered by focused unit tests or an e2e scenario, including checks that handled shortcuts do not leak printable characters into editable content.