Add title field to EmailTemplate model and update UI

src/app/api/email-templates/[id]/route.ts

@@ -55,17 +55,18 @@ export async function PUT(
         }
 
         const data = await request.json();
-        const { content } = data;
+        const { title, content } = data;
 
         // Validate required fields
-        if (!content) {
+        if (!title || !content) {
             return NextResponse.json(
-                { error: 'Content is required' },
+                { error: 'Title and content are required' },
                 { status: 400 }
             );
         }
 
         // Update email template fields
+        emailTemplate.title = title;
         emailTemplate.content = content;
 
         // Save the updated email template