feat(mobile): improve login, profile, alerts screens and dark mode background
- Unify login/register into single screen with tab switcher, logo, and themed inputs - Redesign profile with header card, segmented theme toggle, icon-based menu, and bottom-sheet modals - Add auth guard to alerts screen showing login prompt instead of 401 error - Switch ImageBackground to explicit Image+View layering for reliable rendering - Add dark mode background image switching in root layout - Add dark mode override for recent-tag in PWA search view
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