fix: Add missing redirect in editBlog catch block

The catch block logged the error but never redirected, causing
Wheels to render editBlog.cfm without any variables set.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: bpamiri

app/controllers/admin/AdminController.cfc

@@ -73,6 +73,8 @@ component extends="app.Controllers.Controller" {
             );
 
             // Redirect with error message
+            flashInsert(error = "Unable to load blog post for editing.");
+            redirectTo(route = "dashboard");
         }
     }