feat: implement tests and coverage reports for KpiCards and scrapeLakes functionality

package.json

@@ -12,7 +12,10 @@
     "scrape": "tsx scripts/scrapeLakes.ts",
     "build-index": "tsx scripts/buildIndex.ts",
     "data:update": "npm run scrape && npm run build-index",
-    "data:watch": "tsx scripts/watchData.ts"
+    "data:watch": "tsx scripts/watchData.ts",
+    "test": "vitest run",
+    "test:watch": "vitest",
+    "coverage": "vitest run --coverage"
   },
   "dependencies": {
     "axios": "^1.17.0",
@@ -28,18 +31,24 @@
   },
   "devDependencies": {
     "@eslint/js": "^9.39.1",
+    "@testing-library/dom": "^10.4.1",
+    "@testing-library/jest-dom": "^6.9.1",
+    "@testing-library/react": "^16.3.2",
     "@types/leaflet": "^1.9.21",
     "@types/node": "^24.10.1",
     "@types/react": "^19.2.5",
     "@types/react-dom": "^19.2.3",
     "@vitejs/plugin-react": "^5.1.1",
+    "@vitest/coverage-v8": "^4.1.8",
     "eslint": "^9.39.1",
     "eslint-plugin-react-hooks": "^7.0.1",
     "eslint-plugin-react-refresh": "^0.4.24",
     "globals": "^16.5.0",
+    "jsdom": "^29.1.1",
     "tsx": "^4.22.4",
     "typescript": "~5.9.3",
     "typescript-eslint": "^8.46.4",
-    "vite": "^7.2.4"
+    "vite": "^7.2.4",
+    "vitest": "^4.1.8"
   }
 }