* fix(macos): host the dashboard sidebar toggle beside back/forward in the titlebar
The Control UI's floating sidebar-expand button rendered as a bordered web
control crowding the traffic lights in the dashboard window. The toggle now
lives as a native borderless button in the leading titlebar accessory ahead
of back/forward (Safari ordering) and bridges to the web UI via the
openclaw:native-toggle-sidebar event; the injected chrome script advertises
the capability with an openclaw-native-nav class so the web control retires
itself visually while staying keyboard/screen-reader reachable.
* docs: note the macOS app's native titlebar sidebar toggle in the Control UI guide
df16372af3
