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/app/globals.css

@@ -900,16 +900,14 @@ tbody tr:hover {
   border-color: #f97316;
 }
 
-/* ── Glass dropdown (backdrop blur + animation) ─────────────── */
-.glass-dropdown {
-  backdrop-filter: blur(20px) saturate(200%);
-  -webkit-backdrop-filter: blur(20px) saturate(200%);
-  background-color: color-mix(in srgb, var(--color-dropdown) 60%, transparent);
+/* ── Dropdown menu (solid color + animation) ─────────────────── */
+.dropdown-menu {
+  background-color: var(--color-dropdown);
   border: 1px solid color-mix(in srgb, var(--color-text-muted) 14%, transparent);
   box-shadow: 0 8px 32px color-mix(in srgb, rgb(0 0 0) 20%, transparent);
 }
 
-details[open] > .glass-dropdown {
+details[open] > .dropdown-menu {
   animation: dropdownIn 0.15s ease-out;
 }