New screen for viewing endoscopy results: 2×2 snapshot grid with
simulated endoscopic view (radial gradient + specular highlight),
diagnosis chips, conclusion, numbered recommendations, PDF/share
actions, and full-screen image viewer with pagination.
Wired via nav route `result:<id>` from ResultsScreen and exposed in
Tweaks screen selector.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>