Add world-class mobile components and Staking/Governance screens

PHASE 1 & 2 of mobile app transformation completed.

New Modern Component Library:
- Card: Elevated, outlined, filled variants with press states
- Button: 5 variants (primary, secondary, outline, ghost, danger) with Kurdistan colors
- Input: Floating labels, validation, icons, focus states
- BottomSheet: Swipe-to-dismiss modal with smooth animations
- LoadingSkeleton: Shimmer loading states (Skeleton, CardSkeleton, ListItemSkeleton)
- Badge: Status indicators and labels for Tiki roles

New Screens:
1. StakingScreen (504 lines):
   - View staked amount and rewards
   - Live staking data from blockchain
   - Stake/Unstake with bottom sheets
   - Tiki score breakdown
   - Monthly PEZ rewards calculation
   - APY estimation
   - Unbonding status
   - Inspired by Polkadot.js and Argent

2. GovernanceScreen (447 lines):
   - Active proposals list
   - Vote FOR/AGAINST proposals
   - Real-time voting statistics
   - Vote progress visualization
   - Proposal details bottom sheet
   - Democratic participation interface
   - Inspired by modern DAO platforms

Design Principles:
✅ Kurdistan colors (Kesk, Sor, Zer) throughout
✅ Material Design 3 inspired
✅ Smooth animations and transitions
✅ Clean, modern UI
✅ Accessibility-first
✅ RTL support ready

All components use:
- Shared theme from @pezkuwi/theme
- Shared blockchain logic from @pezkuwi/lib
- TypeScript with full type safety
- React Native best practices

Next: DEX/Swap, NFT Gallery, Transaction History

mobile/src/components/index.ts

@@ -0,0 +1,11 @@
+/**
+ * Modern Component Library for PezkuwiChain Mobile
+ * Inspired by Material Design 3, iOS HIG, and Kurdistan aesthetics
+ */
+
+export { Card } from './Card';
+export { Button } from './Button';
+export { Input } from './Input';
+export { BottomSheet } from './BottomSheet';
+export { Skeleton, CardSkeleton, ListItemSkeleton } from './LoadingSkeleton';
+export { Badge } from './Badge';