ManuNotes for iOS 0.3.1

Simulator-only build. This does not install on a physical iPhone — that needs a paid Apple Developer Program enrollment (ad-hoc export or TestFlight), not yet active for this project. Unzip and drag ManuNotes.app onto a running iOS Simulator window, or xcrun simctl install <device> ManuNotes.app.

Changed

• "Sobre" moved out of the export/import menu. It's now its own
  tappable button in the header — the app's icon, the same size as the
  export and search buttons next to it — instead of an item buried
  inside the export menu.

Fixed

• A note with a mismatched encryption key made every other note
  disappear. loadAll() decoded every note in a single try, so one
  record that failed to decrypt (e.g. after a Keychain item was lost —
  a device restore, a corrupted item) silently emptied the whole list
  instead of just that one note. Bad records are now skipped
  individually and logged, and both the load and save paths now log
  failures instead of swallowing them with try?. Shared with macOS
  via ManuNotesCore.