feat: implement event submission flow with image upload and modal interface

app/actions/upload.ts

@@ -13,7 +13,13 @@ export async function uploadImage(formData: FormData) {
 
     // Convert to Base64
     const base64 = buffer.toString('base64');
-    const mimeType = file.type || 'image/jpeg';
+    let mimeType = file.type || 'image/jpeg';
+    
+    // Normalize JPEG mime types
+    if (mimeType === 'image/jpg' || mimeType === 'image/pjpeg') {
+      mimeType = 'image/jpeg';
+    }
+    
     const dataUrl = `data:${mimeType};base64,${base64}`;
 
     // Return the data URL directly (it will be saved in the database)