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.

.agents/skills/expo-dev-client/SKILL.md

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+---
+name: expo-dev-client
+description: Build and distribute Expo development clients locally or via TestFlight
+version: 1.0.0
+license: MIT
+---
+
+Use EAS Build to create development clients for testing native code changes on physical devices. Use this for creating custom Expo Go clients for testing branches of your app.
+
+## Important: When Development Clients Are Needed
+
+**Only create development clients when your app requires custom native code.** Most apps work fine in Expo Go.
+
+You need a dev client ONLY when using:
+- Local Expo modules (custom native code)
+- Apple targets (widgets, app clips, extensions)
+- Third-party native modules not in Expo Go
+
+**Try Expo Go first** with `npx expo start`. If everything works, you don't need a dev client.
+
+## EAS Configuration
+
+Ensure `eas.json` has a development profile:
+
+```json
+{
+  "cli": {
+    "version": ">= 16.0.1",
+    "appVersionSource": "remote"
+  },
+  "build": {
+    "production": {
+      "autoIncrement": true
+    },
+    "development": {
+      "autoIncrement": true,
+      "developmentClient": true
+    }
+  },
+  "submit": {
+    "production": {},
+    "development": {}
+  }
+}
+```
+
+Key settings:
+- `developmentClient: true` - Bundles expo-dev-client for development builds
+- `autoIncrement: true` - Automatically increments build numbers
+- `appVersionSource: "remote"` - Uses EAS as the source of truth for version numbers
+
+## Building for TestFlight
+
+Build iOS dev client and submit to TestFlight in one command:
+
+```bash
+eas build -p ios --profile development --submit
+```
+
+This will:
+1. Build the development client in the cloud
+2. Automatically submit to App Store Connect
+3. Send you an email when the build is ready in TestFlight
+
+After receiving the TestFlight email:
+1. Download the build from TestFlight on your device
+2. Launch the app to see the expo-dev-client UI
+3. Connect to your local Metro bundler or scan a QR code
+
+## Building Locally
+
+Build a development client on your machine:
+
+```bash
+# iOS (requires Xcode)
+eas build -p ios --profile development --local
+
+# Android
+eas build -p android --profile development --local
+```
+
+Local builds output:
+- iOS: `.ipa` file
+- Android: `.apk` or `.aab` file
+
+## Installing Local Builds
+
+Install iOS build on simulator:
+
+```bash
+# Find the .app in the .tar.gz output
+tar -xzf build-*.tar.gz
+xcrun simctl install booted ./path/to/App.app
+```
+
+Install iOS build on device (requires signing):
+
+```bash
+# Use Xcode Devices window or ideviceinstaller
+ideviceinstaller -i build.ipa
+```
+
+Install Android build:
+
+```bash
+adb install build.apk
+```
+
+## Building for Specific Platform
+
+```bash
+# iOS only
+eas build -p ios --profile development
+
+# Android only
+eas build -p android --profile development
+
+# Both platforms
+eas build --profile development
+```
+
+## Checking Build Status
+
+```bash
+# List recent builds
+eas build:list
+
+# View build details
+eas build:view
+```
+
+## Using the Dev Client
+
+Once installed, the dev client provides:
+- **Development server connection** - Enter your Metro bundler URL or scan QR
+- **Build information** - View native build details
+- **Launcher UI** - Switch between development servers
+
+Connect to local development:
+
+```bash
+# Start Metro bundler
+npx expo start --dev-client
+
+# Scan QR code with dev client or enter URL manually
+```
+
+## Troubleshooting
+
+**Build fails with signing errors:**
+```bash
+eas credentials
+```
+
+**Clear build cache:**
+```bash
+eas build -p ios --profile development --clear-cache
+```
+
+**Check EAS CLI version:**
+```bash
+eas --version
+eas update
+```