fix: prevent app crash when wallet locks during Supply modal interaction

[mmarfinetz]

Summary

Fixes #2382 - Prevents app crash when wallet is locked while Supply modal is open

Changes

• ✅ Fixed UserAuthenticated component to handle disconnection gracefully
• ✅ Added WalletGuard provider to monitor wallet disconnection events
• ✅ Enhanced SupplyModal with connection state guards
• ✅ Added TransactionErrorBoundary for additional safety
• ✅ Integrated providers in _app.page.tsx with proper hierarchy

Problem

When users lock their wallet extension (MetaMask/Rabby/Ambire) while the Supply modal is open, the app crashes with:

Uncaught Error: Invariant failed: User data loaded but no user found

Solution

Implemented a two-part defensive strategy:

1. Global Wallet Guard: Monitors disconnection and closes modals automatically
2. Component-Level Guards: Graceful handling with "Connect Wallet" UI

Testing

1. Connect wallet (MetaMask/Rabby/Ambire)
2. Open Supply modal
3. Lock wallet extension
4. Before: App crashes with client exception
5. After: Modal gracefully shows "Connect Wallet" prompt

Impact

• Improves UX reliability
• Prevents data loss during wallet disconnection events
• Establishes pattern for other transaction modals

Screenshots

N/A - Fix is for preventing crashes, behavior change is the absence of errors

Checklist

• [x] Code follows project conventions
• [x] No breaking changes
• [x] Tested with MetaMask, Rabby wallets
• [x] Ready for review