DoF Visualizer

This update adds two new tools to round out the photographer's toolkit. Hyperfocal Distance visualizes the closest focus distance at which everything from H/2 to infinity stays acceptably sharp — the classic landscape technique — with an animate-aperture button that lets you watch the in-focus band stretch and shift in real time as the aperture changes. Sun brings sunrise, sunset, solar noon, day length, golden hour, and civil twilight calculations to any GPS location, computed locally with no internet required; the on-screen arc even rises and falls with the season, taller in summer and flatter in winter. Together they bring the app to ten interactive tools — from depth of field and bokeh through diffraction, focus stacking, and astrophotography — covering essentially every "what will my gear actually do?" question photographers ask before pressing the shutter.