feat: Add comprehensive testing infrastructure

Implements robust testing setup with Playwright global auth, reusable test
helpers, Docker support, and CI/CD integration with Gitea Actions.

## Changes

### Playwright Setup
- Add global auth setup with storage state reuse (tests/playwright/auth.setup.ts)
- Fix auth setup to clear existing state before fresh login
- Create reusable performOAuthLogin helper (tests/playwright/helpers.ts)
- Configure dotenv loading for environment variables in playwright.config.ts

### Magnitude Configuration
- Update to use Claude Sonnet 4.5 (claude-sonnet-4-5-20250514)
- Create reusable loginFlow helper (tests/magnitude/helpers.ts)
- Fix smoke test to check login page instead of non-existent homepage

### Docker Support
- Add Dockerfile.playwright with non-root user (pwuser) for security
- Uses official Playwright Docker image (mcr.microsoft.com/playwright:v1.49.1-noble)
- Provides consistent testing environment across users and CI/CD

### CI/CD Integration
- Add Gitea Actions workflow (.gitea/workflows/magnitude.yml)
- Runs Magnitude tests on every push and PR
- Starts SurrealDB and Next.js dev server automatically
- Uploads test results as artifacts (30-day retention)

### Documentation
- Add comprehensive testing setup docs to AGENTS.md:
  - Playwright Docker setup instructions
  - CI/CD with Gitea Actions
  - Testing framework separation (Playwright vs Magnitude)
  - Required secrets for CI/CD

### Testing Best Practices
- Separate Playwright (manual + global auth) from Magnitude (automated E2E)
- Reusable helpers reduce code duplication
- Both frameworks work independently

## Testing

- ✅ Playwright auth setup test passes (5.6s)
- ✅ Magnitude smoke test passes
- ✅ OAuth flow works correctly with helper function

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

.gitea/workflows/magnitude.yml

@@ -0,0 +1,75 @@
+# Gitea Actions workflow for running Magnitude tests
+name: Magnitude Tests
+
+on:
+  push:
+    branches: [main, development]
+  pull_request:
+    branches: [main, development]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: '20'
+
+      - name: Install pnpm
+        run: npm install -g pnpm
+
+      - name: Install dependencies
+        run: pnpm install --frozen-lockfile
+
+      - name: Start SurrealDB
+        run: |
+          docker run -d \
+            --name surrealdb \
+            -p 8000:8000 \
+            -e SURREAL_USER=${{ secrets.SURREALDB_USER }} \
+            -e SURREAL_PASS=${{ secrets.SURREALDB_PASS }} \
+            surrealdb/surrealdb:latest \
+            start --log trace --user ${{ secrets.SURREALDB_USER }} --pass ${{ secrets.SURREALDB_PASS }} memory
+
+      - name: Wait for SurrealDB
+        run: sleep 5
+
+      - name: Start Next.js dev server
+        run: pnpm dev &
+        env:
+          SURREALDB_URL: ws://localhost:8000/rpc
+          SURREALDB_USER: ${{ secrets.SURREALDB_USER }}
+          SURREALDB_PASS: ${{ secrets.SURREALDB_PASS }}
+          SURREALDB_NS: ${{ secrets.SURREALDB_NS }}
+          SURREALDB_DB: ${{ secrets.SURREALDB_DB }}
+          ATPROTO_CLIENT_ID: ${{ secrets.ATPROTO_CLIENT_ID }}
+          ATPROTO_REDIRECT_URI: ${{ secrets.ATPROTO_REDIRECT_URI }}
+          GOOGLE_API_KEY: ${{ secrets.GOOGLE_API_KEY }}
+          DEEPGRAM_API_KEY: ${{ secrets.DEEPGRAM_API_KEY }}
+          SURREAL_JWT_SECRET: ${{ secrets.SURREAL_JWT_SECRET }}
+          TEST_BLUESKY_HANDLE: ${{ secrets.TEST_BLUESKY_HANDLE }}
+          TEST_BLUESKY_PASSWORD: ${{ secrets.TEST_BLUESKY_PASSWORD }}
+          ANTHROPIC_API_KEY: ${{ secrets.ANTHROPIC_API_KEY }}
+
+      - name: Wait for Next.js server
+        run: npx wait-on http://localhost:3000 --timeout 120000
+
+      - name: Run Magnitude tests
+        run: npx magnitude
+        env:
+          ANTHROPIC_API_KEY: ${{ secrets.ANTHROPIC_API_KEY }}
+          TEST_BLUESKY_HANDLE: ${{ secrets.TEST_BLUESKY_HANDLE }}
+          TEST_BLUESKY_PASSWORD: ${{ secrets.TEST_BLUESKY_PASSWORD }}
+
+      - name: Upload test results
+        if: always()
+        uses: actions/upload-artifact@v4
+        with:
+          name: magnitude-results
+          path: test-results/
+          retention-days: 30