add drag and drop builder

frontend/package-lock.json

@@ -18,6 +18,7 @@
         "@angular/platform-browser": "^17.3.0",
         "@angular/platform-browser-dynamic": "^17.3.0",
         "@angular/router": "^17.3.0",
+        "leaflet": "^1.9.4",
         "rxjs": "~7.8.0",
         "tslib": "^2.3.0",
         "zone.js": "~0.14.3"
@@ -27,6 +28,7 @@
         "@angular/cli": "^17.3.17",
         "@angular/compiler-cli": "^17.3.0",
         "@types/jasmine": "~5.1.0",
+        "@types/leaflet": "^1.9.21",
         "autoprefixer": "^10.5.2",
         "jasmine-core": "~5.1.0",
         "karma": "~6.4.0",
@@ -4563,6 +4565,12 @@
         "@types/send": "*"
       }
     },
+    "node_modules/@types/geojson": {
+      "version": "7946.0.16",
+      "resolved": "https://registry.npmjs.org/@types/geojson/-/geojson-7946.0.16.tgz",
+      "integrity": "sha512-6C8nqWur3j98U6+lXDfTUWIfgvZU+EumvpHKcYjujKH7woYyLj2sUmff0tRhrqM7BohUw7Pz3ZB1jj2gW9Fvmg==",
+      "dev": true
+    },
     "node_modules/@types/http-errors": {
       "version": "2.0.5",
       "resolved": "https://registry.npmjs.org/@types/http-errors/-/http-errors-2.0.5.tgz",
@@ -4590,6 +4598,15 @@
       "integrity": "sha512-5+fP8P8MFNC+AyZCDxrB2pkZFPGzqQWUzpSeuuVLvm8VMcorNYavBqoFcxK8bQz4Qsbn4oUEEem4wDLfcysGHA==",
       "dev": true
     },
+    "node_modules/@types/leaflet": {
+      "version": "1.9.21",
+      "resolved": "https://registry.npmjs.org/@types/leaflet/-/leaflet-1.9.21.tgz",
+      "integrity": "sha512-TbAd9DaPGSnzp6QvtYngntMZgcRk+igFELwR2N99XZn7RXUdKgsXMR+28bUO0rPsWp8MIu/f47luLIQuSLYv/w==",
+      "dev": true,
+      "dependencies": {
+        "@types/geojson": "*"
+      }
+    },
     "node_modules/@types/mime": {
       "version": "1.3.5",
       "resolved": "https://registry.npmjs.org/@types/mime/-/mime-1.3.5.tgz",
@@ -8628,6 +8645,11 @@
         "shell-quote": "^1.8.4"
       }
     },
+    "node_modules/leaflet": {
+      "version": "1.9.4",
+      "resolved": "https://registry.npmjs.org/leaflet/-/leaflet-1.9.4.tgz",
+      "integrity": "sha512-nxS1ynzJOmOlHp+iL3FyWqK89GtNL8U8rvlMOsQdTTssxZwCXh8N2NB3GDQOL+YR3XnWyZAxwQixURb+FA74PA=="
+    },
     "node_modules/less": {
       "version": "4.2.0",
       "resolved": "https://registry.npmjs.org/less/-/less-4.2.0.tgz",