feat(screenshots): Playwright capture pipeline (local-only, viewport-only)

package.json

@@ -8,6 +8,7 @@
     "build": "astro build",
     "preview": "astro preview",
     "check": "astro check",
+    "screenshots": "tsx tools/screenshots/run.ts",
     "astro": "astro"
   },
   "dependencies": {
@@ -20,6 +21,9 @@
   },
   "devDependencies": {
     "@astrojs/check": "^0.9.9",
+    "@types/node": "^25.8.0",
+    "playwright": "^1.60.0",
+    "tsx": "^4.22.1",
     "typescript": "^6.0.3"
   }
 }