Can AI replace Shotomatic?

Build me a local macOS screenshot automation app covering Shotomatic's basic loop.
Requirements:

- Use SwiftUI and ScreenCaptureKit in a native macOS 14+ app with no third-party packages.
- Provide a source picker for one display or one visible window, with thumbnail previews.
- Let me set an interval in seconds and stop after a screenshot count or elapsed duration.
- Show a three-second countdown, live running status, captured count, and a clear Stop button.
- Save every capture as PNG or JPEG in ~/Pictures/Capture Sessions/<timestamp>/.
- Keep a local session list with thumbnails; open a session in Finder or delete it with confirmation.
- Add one optional keypress after each capture using CGEvent so paged content can advance.
- Check Screen Recording and Accessibility permission before starting; explain how to grant each.
- Never upload files, add accounts, or collect telemetry. The app must work fully offline.
- Handle a display or window disappearing mid-session without losing images already captured.
- Include a small unit-tested state machine for idle, countdown, running, stopping, and failed states.
- Include a README with build, permission, and signing notes plus a manual smoke-test checklist.
- Out of scope: custom-area capture, website batches, guide editing, annotations, PDF/ZIP/MP4 export.
- Produce an Xcode project that builds and runs, then run the unit tests before finishing.