ci: add E2E test-dapp job to CI workflow (#24)

Run Playwright e2e tests against the test-dapp on PRs, in parallel with
the existing lint/typecheck/unit-test job. Uses only Chromium and the
hardcoded testnet key — no secrets required.

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

Author: satoshai-dev

.github/workflows/ci.yml

@@ -41,3 +41,31 @@ jobs:
 
       - name: Changeset check
         run: npx changeset status --since=origin/main
+
+  e2e:
+    name: E2E Tests (test-dapp)
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Install pnpm
+        uses: pnpm/action-setup@v4
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: 20
+          cache: pnpm
+
+      - name: Install dependencies
+        run: pnpm install --frozen-lockfile
+
+      - name: Build
+        run: pnpm build
+
+      - name: Install Playwright browsers
+        run: pnpm --filter test-dapp exec playwright install --with-deps chromium
+
+      - name: Run E2E tests
+        run: pnpm test:e2e:test-dapp