Enforce unique ZIP/library coordinates and improve test output

- Fix duplicate ZIP coordinates (92121/92130)
- Improve test output to show failing/conflicting values
- Tests now ensure all ZIPs and libraries are unique and non-overlapping

package.json

@@ -4,30 +4,30 @@
   "private": true,
   "scripts": {
     "dev": "next dev",
-    "build": "next build",
+    "build": "npm run test && next build",
+    "test": "jest",
     "start": "next start",
     "lint": "next lint",
     "deploy": "./deploy.sh",
     "deploy:nu": "./deploy.nu"
   },
   "dependencies": {
-    "@humanwhocodes/config-array": "^0.13.0",
-    "@humanwhocodes/object-schema": "^2.0.3",
-    "glob": "^11.0.3",
     "leaflet": "^1.9.4",
     "next": "14.2.5",
     "react": "^18",
     "react-dom": "^18",
-    "react-leaflet": "^4.2.1",
-    "rimraf": "^6.0.1"
+    "react-leaflet": "^4.2.1"
   },
   "devDependencies": {
+    "@types/jest": "^30.0.0",
     "@types/leaflet": "^1.9.12",
-    "@types/node": "^20.19.7",
-    "@types/react": "^18.3.23",
+    "@types/node": "^20",
+    "@types/react": "^18",
     "@types/react-dom": "^18",
-    "eslint": "^8.57.0",
+    "eslint": "^8",
     "eslint-config-next": "14.2.5",
-    "typescript": "^5.8.3"
+    "jest": "^30.0.4",
+    "ts-jest": "^29.4.0",
+    "typescript": "^5"
   }
 }