ci: run the Playwright e2e non-regression suite in CI

Add a `make test-e2e` target that builds the client and backend, serves the
built client through smocker (seeded with tests/sessions), runs the Playwright
suite against it, then stops the server. Wire it into CI as a dedicated `e2e`
job (installs the Chromium browser via `npx playwright install --with-deps`)
and make `deploy` depend on it.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Author: gwleclerc

.github/workflows/main.yml

@@ -102,8 +102,32 @@ jobs:
           name: smocker-bin
           path: ./build/smocker.tar.gz
 
+  e2e:
+    runs-on: ubuntu-latest
+    timeout-minutes: 10
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-node@v4
+        with:
+          node-version-file: .nvmrc
+          cache: npm
+
+      - name: Setup Go environment
+        uses: actions/setup-go@v5
+        with:
+          go-version: stable
+
+      - run: npm ci
+
+      - name: Install Playwright browser
+        run: npx playwright install --with-deps chromium
+
+      - name: Run Playwright non-regression suite
+        run: make test-e2e
+
   deploy:
-    needs: [lint, test, build]
+    needs: [lint, test, build, e2e]
     if: startsWith(github.ref, 'refs/tags/')
     runs-on: ubuntu-latest
     timeout-minutes: 10

Makefile

@@ -102,6 +102,23 @@ test-integration: $(VENOM) check-default-ports persistence
 start-integration: $(VENOM)
 	$(VENOM) run tests/features/$(SUITE)
 
+# End-to-end UI non-regression tests (Playwright). Builds the client and backend, serves the
+# built client through smocker (seeded with tests/sessions), runs the suite, then stops the
+# server. Requires the Playwright browser to be installed (npx playwright install chromium).
+E2E_MOCK_PORT ?= 8080
+E2E_ADMIN_PORT ?= 8081
+.PHONY: test-e2e
+test-e2e: build persistence
+	npm run build
+	SMOCKER_PERSISTENCE_DIRECTORY=./$(SESSIONS_DIR) ./$(BUILD_DIR)/$(APPNAME) \
+		--static-files ./$(BUILD_DIR)/client \
+		--mock-server-listen-port=$(E2E_MOCK_PORT) --config-listen-port=$(E2E_ADMIN_PORT) \
+		> $(BUILD_DIR)/e2e-smocker.log 2>&1 & \
+	SMK_PID=$$!; \
+	for i in $$(seq 1 30); do curl -sf localhost:$(E2E_ADMIN_PORT)/version >/dev/null 2>&1 && break; sleep 0.3; done; \
+	SMOCKER_E2E_URL=http://localhost:$(E2E_ADMIN_PORT) npx playwright test --config tests/e2e/playwright.config.ts; \
+	RC=$$?; kill $$SMK_PID 2>/dev/null || true; exit $$RC
+
 $(COVERAGE_DIR)/test-cover.out:
 	$(MAKE) test