refactor: harden deps, fix geo math, and add engineering tooling

Replace xlsx with exceljs, unify CRS/DMS logic, move pages to views with shared map/toast composables, and add Vitest/ESLint/Prettier plus docs.

Co-authored-by: Cursor <cursoragent@cursor.com>

package.json

@@ -6,20 +6,34 @@
   "scripts": {
     "dev": "vite",
     "build": "vite build",
-    "preview": "vite preview"
+    "preview": "vite preview",
+    "test": "vitest run",
+    "test:watch": "vitest",
+    "lint": "eslint .",
+    "lint:fix": "eslint . --fix",
+    "format": "prettier --write \"src/**/*.{js,vue,css,md}\""
   },
   "dependencies": {
-    "@turf/turf": "^7.3.3",
+    "@turf/area": "^7.4.0",
+    "@turf/helpers": "^7.4.0",
+    "@turf/length": "^7.4.0",
+    "exceljs": "^4.4.0",
     "gcoord": "^1.0.7",
     "leaflet": "^1.9.4",
     "lucide-vue-next": "^0.563.0",
     "proj4": "^2.20.4",
     "vue": "^3.5.24",
-    "vue-router": "^4.6.4",
-    "xlsx": "^0.18.5"
+    "vue-router": "^4.6.4"
   },
   "devDependencies": {
+    "@eslint/js": "^10.0.1",
     "@vitejs/plugin-vue": "^6.0.1",
-    "vite": "^7.2.4"
+    "eslint": "^10.8.1",
+    "eslint-config-prettier": "^10.1.8",
+    "eslint-plugin-vue": "^10.10.0",
+    "globals": "^17.9.0",
+    "prettier": "^3.9.6",
+    "vite": "^7.2.4",
+    "vitest": "^4.1.10"
   }
 }