* feat(app): open a project with Cmd+O
Cmd+O now opens the project picker (was Cmd+Shift+O). New worktree,
which previously used Cmd+O, no longer has a keyboard shortcut; its
sidebar button still creates one.
* test(app): assert old Cmd+Shift+O open-project binding is unbound
Locks in the rebind to Cmd+O so re-adding a Cmd+Shift+O binding would fail CI.
* fix(app): keep Open project override id stable and forward Cmd+O in desktop browser
- Binding ids for Open project keep their original names so existing user
shortcut overrides (keyed by binding id) survive the Cmd+Shift+O -> Cmd+O rebind.
- Forward "o" from focused browser webviews in the desktop app so Cmd/Ctrl+O
reaches the renderer and opens the project picker there too.
