fix(web): right panel shortcuts on non-Latin layouts and terminal close dialog UX#13428

fix(web): ignore launcher keydown events when right panel is closed

fix(web): isolate settings persistence errors in confirmTerminalClose

fix(web): persist terminal close opt-out via persistClientSettingsUpdate

docs(web): add docstrings for touched components and dialog utilities

fix(web): address review feedback on right panel shortcuts and confirmation dialog

fix(web): improve right panel shortcuts reliability and terminal close confirmation dialog