webui: Add missing step to make install
diff --git a/webui/Makefile b/webui/Makefile
index 58c3373..d6e6d13 100644
--- a/webui/Makefile
+++ b/webui/Makefile
@@ -2,6 +2,7 @@
 
 install:
 	npm ci
+	npm run playwright-install
 
 demo:
 	npm run demo
diff --git a/webui/package.json b/webui/package.json
index 9965575..8ad544f 100644
--- a/webui/package.json
+++ b/webui/package.json
@@ -10,6 +10,7 @@
     "./sketch-app-shell.js": "./dist/sketch-app-shell.js"
   },
   "scripts": {
+    "playwright-install": "playwright install",
     "check": "tsc --noEmit",
     "demo": "vite --open src/web-components/demo/index.html",
     "demo:mermaid": "vite --open src/web-components/demo/mermaid-test/index.html",