Dismiss the preview card when its recording is deleted

Deleting a project removed the package and the History row but left the
overlay card on screen, still pointing at footage that no longer existed.
The overlay is a third view of the same recording and, unlike the other
two, is never rebuilt from disk, so it has to be told.

Handled in RecordingProjectStore.delete, the one place that already owns
keeping the package and History in agreement, which also covers deleting a
project from the Projects browser. The card is dismissed first, while its
files are still on disk.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_015JKumBzipQQn9vrJ4XDiiB