Retire orphaned WebApp tests and classify regression guards

src/apps/webapp/package.json

@@ -15,12 +15,9 @@
         "octagonal-wheels": "^0.1.51"
     },
     "devDependencies": {
-        "@playwright/test": "^1.58.2",
         "@sveltejs/vite-plugin-svelte": "^7.1.2",
-        "playwright": "^1.58.2",
         "svelte": "5.56.3",
         "typescript": "5.9.3",
-        "vite": "^8.0.16",
-        "vite-plugin-istanbul": "^9.0.1"
+        "vite": "^8.0.16"
     }
 }