* feat(web): add a keyboard shortcut to show or hide the sidebar
The notebook sidebar can already collapse into an icon rail, but only
with the mouse. Add a configurable "Show/hide sidebar" shortcut,
Ctrl/⌘+\ by default, next to the existing outline shortcut. It toggles
the same persisted collapsed state, works only in the desktop layout,
and is ignored while a dialog or another view is open. The collapse
button tooltip now shows the shortcut.
Refs #97
* fix(web): ignore the sidebar shortcut while Focus Mode is on
Focus Mode hides the notebook sidebar, so the shortcut used to change
and save its collapsed state without any visible feedback. It now does
nothing while Focus Mode is active, and the saved state is left as it
was when Focus Mode ends.
Refs #97
Dariusz Koryto
ea759ab092