Add PostCSS configuration and skills lock file

- Created a new PostCSS configuration file to integrate Tailwind CSS.
- Added a skills lock file containing various Expo skills with their respective source and computed hashes.

package.json

@@ -12,9 +12,12 @@
   },
   "dependencies": {
     "@expo/vector-icons": "^15.0.3",
+    "@openim/rn-client-sdk": "3.8.3-patch.12.1",
     "@react-navigation/bottom-tabs": "^7.4.0",
     "@react-navigation/elements": "^2.6.3",
     "@react-navigation/native": "^7.1.8",
+    "@tailwindcss/postcss": "^4.2.1",
+    "clsx": "^2.1.1",
     "expo": "~54.0.33",
     "expo-constants": "~18.0.13",
     "expo-dev-client": "~6.0.20",
@@ -28,21 +31,32 @@
     "expo-symbols": "~1.0.8",
     "expo-system-ui": "~6.0.9",
     "expo-web-browser": "~15.0.10",
+    "nativewind": "5.0.0-preview.2",
     "react": "19.1.0",
     "react-dom": "19.1.0",
     "react-native": "0.81.5",
+    "react-native-css": "3.0.4",
+    "react-native-fs": "^2.20.0",
     "react-native-gesture-handler": "~2.28.0",
     "react-native-reanimated": "~4.1.1",
     "react-native-safe-area-context": "~5.6.0",
     "react-native-screens": "~4.16.0",
     "react-native-web": "~0.21.0",
-    "react-native-worklets": "0.5.1"
+    "react-native-worklets": "0.5.1",
+    "tailwind-merge": "^3.5.0",
+    "tailwindcss": "^4.2.1"
   },
   "devDependencies": {
     "@types/react": "~19.1.0",
     "eslint": "^9.25.0",
     "eslint-config-expo": "~10.0.0",
+    "lightningcss": "1.30.1",
     "typescript": "~5.9.2"
   },
-  "private": true
+  "private": true,
+  "pnpm": {
+    "overrides": {
+      "lightningcss": "1.30.1"
+    }
+  }
 }