M2-T09: build data visualization UI (heatmap map as home page)

- self-contained RecordsMap (only module importing leaflet/react-leaflet/
  leaflet.heat/leaflet.markercluster); OSM tiles, swappable behind clean props
- heatmap layers for location + poo (primary); time-range selector fetches
  only the window (locations server-filtered; poo client-filtered)
- toggleable scatter layer with marker clustering; point-select reuses T10's
  edit/delete modals + hooks; query-key prefixes refresh map on mutation
- pure map logic isolated + unit-tested; leaflet mocked in component tests
- responsive layout; typed client only

frontend/package-lock.json

@@ -11,9 +11,15 @@
         "@mantine/core": "^7.17.8",
         "@mantine/hooks": "^7.17.8",
         "@tanstack/react-query": "^5.101.0",
+        "@types/leaflet": "^1.9.21",
+        "@types/leaflet.markercluster": "^1.5.6",
+        "leaflet": "^1.9.4",
+        "leaflet.heat": "^0.2.0",
+        "leaflet.markercluster": "^1.5.3",
         "openapi-fetch": "^0.17.0",
         "react": "^18.3.1",
         "react-dom": "^18.3.1",
+        "react-leaflet": "^4.2.1",
         "react-router-dom": "^6.30.4"
       },
       "devDependencies": {
@@ -1338,6 +1344,17 @@
         "react": "^18.x || ^19.x"
       }
     },
+    "node_modules/@react-leaflet/core": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/@react-leaflet/core/-/core-2.1.0.tgz",
+      "integrity": "sha512-Qk7Pfu8BSarKGqILj4x7bCSZ1pjuAPZ+qmRwH5S7mDS91VSbVVsJSrW4qA+GPrro8t69gFYVMWb1Zc4yFmPiVg==",
+      "license": "Hippocratic-2.1",
+      "peerDependencies": {
+        "leaflet": "^1.9.0",
+        "react": "^18.0.0",
+        "react-dom": "^18.0.0"
+      }
+    },
     "node_modules/@redocly/ajv": {
       "version": "8.11.2",
       "resolved": "https://registry.npmjs.org/@redocly/ajv/-/ajv-8.11.2.tgz",
@@ -2053,6 +2070,12 @@
       "dev": true,
       "license": "MIT"
     },
+    "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==",
+      "license": "MIT"
+    },
     "node_modules/@types/json-schema": {
       "version": "7.0.15",
       "resolved": "https://registry.npmjs.org/@types/json-schema/-/json-schema-7.0.15.tgz",
@@ -2060,6 +2083,24 @@
       "dev": true,
       "license": "MIT"
     },
+    "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==",
+      "license": "MIT",
+      "dependencies": {
+        "@types/geojson": "*"
+      }
+    },
+    "node_modules/@types/leaflet.markercluster": {
+      "version": "1.5.6",
+      "resolved": "https://registry.npmjs.org/@types/leaflet.markercluster/-/leaflet.markercluster-1.5.6.tgz",
+      "integrity": "sha512-I7hZjO2+isVXGYWzKxBp8PsCzAYCJBc29qBdFpquOCkS7zFDqUsUvkEOyQHedsk/Cy5tocQzf+Ndorm5W9YKTQ==",
+      "license": "MIT",
+      "dependencies": {
+        "@types/leaflet": "^1.9"
+      }
+    },
     "node_modules/@types/prop-types": {
       "version": "15.7.15",
       "resolved": "https://registry.npmjs.org/@types/prop-types/-/prop-types-15.7.15.tgz",
@@ -4951,6 +4992,26 @@
         "json-buffer": "3.0.1"
       }
     },
+    "node_modules/leaflet": {
+      "version": "1.9.4",
+      "resolved": "https://registry.npmjs.org/leaflet/-/leaflet-1.9.4.tgz",
+      "integrity": "sha512-nxS1ynzJOmOlHp+iL3FyWqK89GtNL8U8rvlMOsQdTTssxZwCXh8N2NB3GDQOL+YR3XnWyZAxwQixURb+FA74PA==",
+      "license": "BSD-2-Clause"
+    },
+    "node_modules/leaflet.heat": {
+      "version": "0.2.0",
+      "resolved": "https://registry.npmjs.org/leaflet.heat/-/leaflet.heat-0.2.0.tgz",
+      "integrity": "sha512-Cd5PbAA/rX3X3XKxfDoUGi9qp78FyhWYurFg3nsfhntcM/MCNK08pRkf4iEenO1KNqwVPKCmkyktjW3UD+h9bQ=="
+    },
+    "node_modules/leaflet.markercluster": {
+      "version": "1.5.3",
+      "resolved": "https://registry.npmjs.org/leaflet.markercluster/-/leaflet.markercluster-1.5.3.tgz",
+      "integrity": "sha512-vPTw/Bndq7eQHjLBVlWpnGeLa3t+3zGiuM7fJwCkiMFq+nmRuG3RI3f7f4N4TDX7T4NpbAXpR2+NTRSEGfCSeA==",
+      "license": "MIT",
+      "peerDependencies": {
+        "leaflet": "^1.3.1"
+      }
+    },
     "node_modules/levn": {
       "version": "0.4.1",
       "resolved": "https://registry.npmjs.org/levn/-/levn-0.4.1.tgz",
@@ -5634,6 +5695,20 @@
       "dev": true,
       "license": "MIT"
     },
+    "node_modules/react-leaflet": {
+      "version": "4.2.1",
+      "resolved": "https://registry.npmjs.org/react-leaflet/-/react-leaflet-4.2.1.tgz",
+      "integrity": "sha512-p9chkvhcKrWn/H/1FFeVSqLdReGwn2qmiobOQGO3BifX+/vV/39qhY8dGqbdcPh1e6jxh/QHriLXr7a4eLFK4Q==",
+      "license": "Hippocratic-2.1",
+      "dependencies": {
+        "@react-leaflet/core": "^2.1.0"
+      },
+      "peerDependencies": {
+        "leaflet": "^1.9.0",
+        "react": "^18.0.0",
+        "react-dom": "^18.0.0"
+      }
+    },
     "node_modules/react-number-format": {
       "version": "5.4.5",
       "resolved": "https://registry.npmjs.org/react-number-format/-/react-number-format-5.4.5.tgz",