Fix all shadow deprecation warnings across entire mobile app

- Replaced shadowColor/shadowOffset/shadowOpacity/shadowRadius with boxShadow
- Fixed 28 files (21 screens + 7 components)
- Preserved elevation for Android compatibility
- All React Native Web deprecation warnings resolved

Files fixed:
- All screen components
- All reusable components
- Navigation components
- Modal components

web/src/contexts/AuthContext.tsx

@@ -178,7 +178,7 @@ export const AuthProvider: React.FC<{ children: React.ReactNode }> = ({ children
       setLoading(false);
     });
 
-    // Listen for wallet changes (from PolkadotContext)
+    // Listen for wallet changes (from PezkuwiContext)
     const handleWalletChange = () => {
       checkAdminStatus();
     };