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

mobile/app.json

@@ -1,7 +1,7 @@
 {
   "expo": {
-    "name": "mobile",
-    "slug": "mobile",
+    "name": "Pezkuwi Wallet",
+    "slug": "pezkuwi-wallet",
     "version": "1.0.0",
     "orientation": "portrait",
     "icon": "./assets/icon.png",
@@ -16,6 +16,7 @@
       "supportsTablet": true
     },
     "android": {
+      "package": "io.pezkuwichain.wallet",
       "adaptiveIcon": {
         "foregroundImage": "./assets/adaptive-icon.png",
         "backgroundColor": "#ffffff"