Add runtime validation for fleet data

app/page.tsx

@@ -10,6 +10,7 @@ import AircraftForm from "../components/AircraftForm";
 import LegalDisclaimerModal from "../components/LegalDisclaimerModal";
 import LandingPage from "../components/LandingPage"; 
 import { isPointInPolygon, getCGLimitsAtWeight } from "../utils/calculations";
+import { validateFleetData } from "../utils/validation";
 
 export interface CustomStation {
   id: string;
@@ -48,7 +49,15 @@ export default function Home() {
   useEffect(() => {
     const loadedFleet = localStorage.getItem("wb_saved_fleet");
     if (loadedFleet) {
-      try { setSavedPlanes(JSON.parse(loadedFleet)); } catch (e) { console.error(e); }
+      try {
+        const parsed = JSON.parse(loadedFleet);
+        const validated = validateFleetData(parsed);
+        if (validated) {
+          setSavedPlanes(validated);
+        } else {
+          console.error("Loaded fleet data validation failed or was empty.");
+        }
+      } catch (e) { console.error(e); }
     }
     const savedTheme = localStorage.getItem("wb_theme");
     if (savedTheme === "dark") {
@@ -100,13 +109,15 @@ export default function Home() {
     reader.onload = (event) => {
       try {
         const json = JSON.parse(event.target?.result as string);
-        if (Array.isArray(json)) {
-          setSavedPlanes(json);
-          localStorage.setItem("wb_saved_fleet", JSON.stringify(json));
+        const validated = validateFleetData(json);
+
+        if (validated) {
+          setSavedPlanes(validated);
+          localStorage.setItem("wb_saved_fleet", JSON.stringify(validated));
           alert("Fleet imported successfully!");
           setShowSettings(false);
         } else {
-          alert("Invalid file format.");
+          alert("Invalid file format or corrupted data.");
         }
       } catch (err) {
         alert("Error parsing file.");

package.json

@@ -28,7 +28,7 @@
     "@types/react-dom": "^19",
     "autoprefixer": "^10.4.19",
     "cross-env": "^10.1.0",
-    "eslint": "^9",
+    "eslint": "^9.39.2",
     "eslint-config-next": "16.0.10",
     "postcss": "^8.4.31",
     "tailwindcss": "^3.4.17",