PHASE 0 - FOUNDATION:TAMAGUI

[yashmitb]

Changes

What changes did you make? Include screenshots if applicable, or explain how to view the changes.

• Installed and configured @tamagui/babel-plugin and expo-blur.
• Wrapped the root layout (app/_layout.tsx) with <TamaguiProvider> and <Theme>.
• Extracted existing colors from constants/Colors.ts into a centralized Tamagui tokens file (constants/tamagui-tokens.ts) and defined custom spacing, border radiuses, and surface variants.
• Configured custom typography and themes in tamagui.config.ts.
• Created new custom reusable Tamagui UI Primitives in components/primitives/:
  • Screen.tsx
  • AppText.tsx
  • AppButton.tsx
  • Card.tsx
  • GlassCard.tsx
  • SectionTitle.tsx
  • StatCard.tsx
  • DonutCard.tsx
  • QuickActionCard.tsx
  • SegmentedControl.tsx
  • AppInput.tsx
• Added a standalone app/demo.tsx route to showcase all the new primitive components matching the provided UI design aesthetic. No existing screens or navigation were migrated/modified yet.

To view the changes:
Run the app and manually navigate to the /demo route to view the new UI primitive showcase.