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

pezkuwi-sdk-ui/packages/apps/webpack.config.cjs

@@ -22,7 +22,7 @@ module.exports = merge(
     plugins: [
       new SubresourceIntegrityPlugin(),
       new HtmlWebpackPlugin({
-        PAGE_TITLE: 'Polkadot/Substrate Portal',
+        PAGE_TITLE: 'Pezkuwi Explorer',
         minify: false,
         template: path.join(context, `${hasPublic ? 'public/' : ''}index.html`)
       })