ci: install dashboard deps before vite build

Author: jddunn

.github/workflows/deploy.yml

@@ -32,6 +32,9 @@ jobs:
       - name: Build TypeScript (engine + runtime)
         run: npm run build
 
+      - name: Install dashboard dependencies
+        run: cd src/cli/dashboard && npm ci
+
       - name: Build dashboard
         run: npm run dashboard:build