FEAT-12a: ForSale scaffolding — status+ForSale, abgabe strings, /abgabe route+nav, sale-ad API stub, detail action, jszip

gerbil-manager-web/package.json

@@ -12,6 +12,7 @@
     "test:watch": "vitest"
   },
   "dependencies": {
+    "jszip": "^3.10.1",
     "react": "^19.2.6",
     "react-d3-tree": "^3.6.6",
     "react-dom": "^19.2.6",
@@ -19,6 +20,7 @@
   },
   "devDependencies": {
     "@eslint/js": "^10.0.1",
+    "@playwright/test": "^1.60.0",
     "@types/node": "^24.12.3",
     "@types/react": "^19.2.14",
     "@types/react-dom": "^19.2.3",