Fix composite submission error handling

src/lib/entitySubmissionHelpers.ts

@@ -347,6 +347,29 @@ async function submitCompositeCreation(
     depends_on: null // Will be set by RPC based on refs
   });
 
+  // Pre-validation to catch issues early with actionable error messages
+  if (uploadedPrimary.type === 'park') {
+    if (!primaryData.name) throw new Error('Park name is required');
+    if (!primaryData.slug) throw new Error('Park slug is required');
+    if (!primaryData.park_type) throw new Error('Park type is required');
+    if (!primaryData.status) throw new Error('Park status is required');
+  } else if (uploadedPrimary.type === 'ride') {
+    if (!primaryData.name) throw new Error('Ride name is required');
+    if (!primaryData.slug) throw new Error('Ride slug is required');
+    if (!primaryData.status) throw new Error('Ride status is required');
+  }
+
+  // Validate dependencies
+  for (const dep of uploadedDependencies) {
+    if (dep.type === 'company') {
+      if (!dep.data.name) throw new Error(`${dep.companyType || 'Company'} name is required`);
+      if (!dep.data.slug) throw new Error(`${dep.companyType || 'Company'} slug is required`);
+      if (!dep.data.company_type && !dep.companyType) {
+        throw new Error('Company type is required');
+      }
+    }
+  }
+
   // Use RPC to create submission with items atomically
   const { data: result, error } = await supabase.rpc('create_submission_with_items', {
     p_user_id: userId,
@@ -356,11 +379,30 @@ async function submitCompositeCreation(
   });
 
   if (error) {
-    handleError(error, {
+    // Extract Supabase error details for better error logging
+    const supabaseError = error as { message?: string; code?: string; details?: string; hint?: string };
+    const errorMessage = supabaseError.message || 'Unknown error';
+    const errorCode = supabaseError.code;
+    const errorDetails = supabaseError.details;
+    const errorHint = supabaseError.hint;
+    
+    // Create proper Error instance with enhanced context
+    const enhancedError = new Error(
+      `Composite submission failed: ${errorMessage}${errorDetails ? `\nDetails: ${errorDetails}` : ''}${errorHint ? `\nHint: ${errorHint}` : ''}`
+    );
+    
+    handleError(enhancedError, {
       action: 'Composite submission',
-      metadata: { primaryType: uploadedPrimary.type, dependencyCount: dependencies.length },
+      metadata: { 
+        primaryType: uploadedPrimary.type, 
+        dependencyCount: dependencies.length,
+        supabaseCode: errorCode,
+        supabaseDetails: errorDetails,
+        supabaseHint: errorHint
+      },
     });
-    throw new Error(`Failed to create composite submission: ${error instanceof Error ? error.message : 'Unknown error'}`);
+    
+    throw enhancedError;
   }
 
   return { submitted: true, submissionId: result };