chore: drop unused SWR hooks and dependency

useSchools, useFilters, useMetrics and useSchoolDetails were imported by
nothing and were the only consumers of swr. All data fetching goes through
lib/api.ts on the server.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

nextjs-app/package-lock.json

@@ -21,7 +21,6 @@
         "react-chartjs-2": "^5.3.1",
         "react-dom": "^19.2.4",
         "react-leaflet": "^5.0.0",
-        "swr": "^2.4.0",
         "typescript": "^5.9.3",
         "zod": "^4.3.6"
       },
@@ -4150,7 +4149,9 @@
       "version": "2.0.3",
       "resolved": "https://registry.npmjs.org/dequal/-/dequal-2.0.3.tgz",
       "integrity": "sha512-0je+qPKHEMohvfRTCEo3CrPG6cAzAYgmzKyxRiYSSDkS6eGJdyVJm7WaYA5ECaAD9wLB2T4EEeymA5aFVcYXCA==",
+      "dev": true,
       "license": "MIT",
+      "peer": true,
       "engines": {
         "node": ">=6"
       }
@@ -9154,19 +9155,6 @@
         "url": "https://github.com/sponsors/ljharb"
       }
     },
-    "node_modules/swr": {
-      "version": "2.4.0",
-      "resolved": "https://registry.npmjs.org/swr/-/swr-2.4.0.tgz",
-      "integrity": "sha512-sUlC20T8EOt1pHmDiqueUWMmRRX03W7w5YxovWX7VR2KHEPCTMly85x05vpkP5i6Bu4h44ePSMD9Tc+G2MItFw==",
-      "license": "MIT",
-      "dependencies": {
-        "dequal": "^2.0.3",
-        "use-sync-external-store": "^1.6.0"
-      },
-      "peerDependencies": {
-        "react": "^16.11.0 || ^17.0.0 || ^18.0.0 || ^19.0.0"
-      }
-    },
     "node_modules/symbol-tree": {
       "version": "3.2.4",
       "resolved": "https://registry.npmjs.org/symbol-tree/-/symbol-tree-3.2.4.tgz",
@@ -9627,15 +9615,6 @@
         "punycode": "^2.1.0"
       }
     },
-    "node_modules/use-sync-external-store": {
-      "version": "1.6.0",
-      "resolved": "https://registry.npmjs.org/use-sync-external-store/-/use-sync-external-store-1.6.0.tgz",
-      "integrity": "sha512-Pp6GSwGP/NrPIrxVFAIkOQeyw8lFenOHijQWkUTrDvrF4ALqylP2C/KCkeS9dpUM3KvYRQhna5vt7IL95+ZQ9w==",
-      "license": "MIT",
-      "peerDependencies": {
-        "react": "^16.8.0 || ^17.0.0 || ^18.0.0 || ^19.0.0"
-      }
-    },
     "node_modules/v8-to-istanbul": {
       "version": "9.3.0",
       "resolved": "https://registry.npmjs.org/v8-to-istanbul/-/v8-to-istanbul-9.3.0.tgz",