Cascade v0.2.2-android (Android)

android: paste-the-link sign-in fallback; v0.2.2

Magic links won't reliably reopen a sideloaded, debug-signed APK (no stable
signing key to pin Android App Links to), so add the desktop-style fallback:
"Email me a link" requests it, then paste the link back into the app to finish.
SyncManager.completeSignInFromLink extracts the token from the pasted URL (or a
raw token) and runs the existing verify flow. Two-step UI with weight-based
fields so the buttons don't overflow.

Bumps to 0.2.2 / versionCode 4.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>