v0.22.2

fix: open LocalRepoDialog from the pre-auth welcome screen

The dialog was mounted inside the `(isAuthenticated || guestMode)`
block, so clicking "Review a local git diff" from the sign-in gate
flipped `localRepoOpen` with no dialog in the DOM to react to it.
Lift it to the main root so every entry point — welcome, compose
form, command palette — resolves to the same instance.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>