Tapping a row in the Undo Log list opens a detail screen showing all
emails in the transaction, source/destination folders (for moves),
the account, action type, and timestamp.
Also fix the dev environment and CI:
- Replace broken dagger/nix 0.20.8 Nix wrapper (infinite self-exec loop)
with a direct 0.21.4 fetchurl derivation in flake.nix
- Wire DAGGER_HOST so the pre-commit dart-check hook reaches the engine
- Bump pubspec.lock (meta 1.17→1.18, test 1.30→1.31) to match CI resolver
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
