Set up Playwright for browser testing

- Playwright config for local browsers (Firefox by default) and Docker Chrome
- docker-compose.chrome.yml for browserless/chrome container (arm64)
- 4 connectivity smoke tests (home, contact, blog pages)
- 3 auth tests (redirect, login, logout) with auth helpers
- Custom fixtures with remote CDP connect support
- Shell scripts for start/stop/full Docker Chrome workflow
- Makefile targets: playwright, playwright-docker, playwright-full

Makefile

@@ -25,3 +25,28 @@ test:
 # Format code
 format:
 	@make -C app format
+
+# Run Playwright browser-based tests (requires running server)
+# Set PLAYWRIGHT_BASE_URL to point at the running Phoenix app
+playwright:
+	@make -C app playwright
+
+# Run Playwright in UI mode (headed browser)
+playwright-ui:
+	@make -C app playwright-ui
+
+# Run Playwright against Docker Chrome container (must be running)
+playwright-docker:
+	@make -C app playwright-docker
+
+# Full e2e workflow: start Chrome container, run tests, stop container
+playwright-full:
+	@make -C app playwright-full
+
+# Start Docker Chrome container
+playwright-docker-start:
+	@make -C app playwright-docker-start
+
+# Stop Docker Chrome container
+playwright-docker-stop:
+	@make -C app playwright-docker-stop