v0.3.0 — USB phone connection guide and named device presets

Added

• Named device presets — Create AVDs from a curated list: Pixel 9 Pro, Pixel 9, Pixel 8 Pro, Pixel 8, Pixel 7, Pixel Fold, Pixel Tablet, and more. System image downloaded automatically if not installed.
• USB phone connection guide — Step-by-step wizard: Developer Options → USB Debugging → cable → authorize
• Unauthorized device detection — Proactive notification when a phone connects without USB debugging enabled
• All device states visible — Unauthorized/offline devices now appear in the sidebar with contextual icons and descriptions
• ADB context menus scoped to ready devices only