In reading mode a plain "e" (guarded against typing targets) switches
to edit mode. In edit mode the platform's native chord — Cmd on macOS,
Ctrl elsewhere — +S saves an unnamed manual snapshot in place, and
+Shift+S asks for a name and returns to reading mode; both always
swallow the browser's save dialog. The shared isTypingTarget guard
moves from TopBar into lib/keyboard.ts next to the new modifier helper.
Unnamed snapshots needed the API to accept them: the version label is
optional now (trigger stays MANUAL, label null), and the history list's
existing null-label fallback text becomes "Manueller Schnappschuss" /
"Manual snapshot" — it only ever shows for exactly those. DB test for
the label-less path, e2e coverage in the CI content pack.
Fixes#125
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Fb2VzvcoBPHkjh8bZ6PzQn