fix: improve error handling in admin pages to show user-friendly error messages

- Add error display to help questions new/edit pages
- Improve error visibility in admin-badges, admin-applications, admin-logs, admin-users pages
- Update createHelpQuestion action to properly handle and display unique name collisions and database errors
- Add user-friendly error messages to admin error handling
- Enhances admin page error reporting for better user experience

src/actions/admin-help.ts

@@ -48,11 +48,12 @@ export async function createHelpQuestion(formData: FormData): Promise<void> {
       targetType: "help_center_category",
       targetId: Number(entry.id),
     });
-  } catch {
-    // Unique name collision or DB error — re-render unchanged.
+  } catch (error) {
+    // Unique name collision or DB error — re-render unchanged with error.
     revalidatePath("/admin/help-questions");
-    return;
+    redirect("/admin/help-questions/new?error=Unique name collision or database error. Please try again.");
   }
+  revalidatePath("/admin/help-questions");
   redirect("/admin/help-questions");
 }