Pressing Cmd+, on macOS did nothing: the stock Flutter template left a
disabled Preferences menu item holding the key equivalent, and nothing
in the app handled the chord.
MainScreen now handles Cmd+, (macOS) / Ctrl+, (Windows/Linux) beside
the existing Cmd+F search shortcut, reusing its tab-aware open path. A
SettingsShortcut fallback above the profile navigator covers pushed
content routes, pushing a named settings route; a navigator observer
blocks the chord while settings is already in the stack, and the video
player route keeps ownership of the keyboard. The dead xib menu item
is removed.
close#1909
edde746
958c27350d