Fix demo video crash on macOS 26 by bypassing _AVKit_SwiftUI bridge

Bump version to 1.1.0 for release

Improve onboarding flow with demo video, step-by-step explainer, and toolbar tooltip

Move accent highlight from "screenshots" to "elements" in hero heading

Add Agentation inspiration credit to How It Works section

Add Swift script to generate pixel-perfect DMG background images

Enable hardened runtime and set development team for notarized distribution

Update README.md

Initial open-source release of Loupe v1.0.0