chore: make required GPS field

src/app/(modules)/upload/page.tsx

@@ -68,6 +68,11 @@ export default function UploadPage() {
       return;
     }
 
+    if (!jsonFile) {
+      setError('Please select a GPS JSON file');
+      return;
+    }
+
     if (!session) {
       setError('Please complete the project selection first');
       return;
@@ -77,10 +82,7 @@ export default function UploadPage() {
     formData.append('file', file);
     formData.append('detection_mode', selectMethod);
     formData.append('chainage_id', session.chainageId as string);
-
-    if (jsonFile) {
     formData.append('json_file', jsonFile);
-    }
 
     setUploading(true);
     setError(null);
@@ -120,7 +122,7 @@ export default function UploadPage() {
   }
 
   const isSessionComplete = !!(session && sessionService.isSessionValid(session));
-  const isFormValid = isSessionComplete && file;
+  const isFormValid = isSessionComplete && file && jsonFile;
 
   return (
     <div className="min-h-screen pb-12">
@@ -162,7 +164,7 @@ export default function UploadPage() {
                   2. Upload Video Data
                 </CardTitle>
                 <CardDescription>
-                  Provide the video file and optional GPS telemetry for processing.
+                  Provide the video file and GPS telemetry for processing.
                 </CardDescription>
               </CardHeader>
               <CardContent className="space-y-6">
@@ -191,7 +193,7 @@ export default function UploadPage() {
                     {/* JSON File Input */}
                     <div className="space-y-2">
                       <Label htmlFor="json-file" className="text-sm font-semibold">
-                        GPS JSON File (Optional)
+                        GPS JSON File <span className="text-destructive">*</span>
                       </Label>
                       <Input
                         id="json-file"
@@ -202,7 +204,8 @@ export default function UploadPage() {
                           setError(null);
                         }}
                         disabled={uploading || !isSessionComplete}
-                        className="h-11 bg-muted/20 file:mr-3 file:py-1.5 file:px-3 file:rounded-md file:border-0 file:bg-primary/10 file:text-primary file:font-medium file:text-xs"
+                        required
+                        className="h-11 bg-muted/30 file:mr-3 file:py-1.5 file:px-3 file:rounded-md file:border-0 file:bg-primary/10 file:text-primary file:font-medium file:text-xs"
                       />
                     </div>