fix: mobile layout and touch target improvements for admin settings

- SettingsTableRow: stack name above controls on mobile, show action
  buttons without hover (max-lg:opacity-100)
- SettingsMobileTabs: increase touch targets to 44px, add scroll spacers
- QuickToggles: increase chip touch targets
- SettingInput: increase display button touch target
- AdminSettings: add bottom padding buffer to mobile layout

src/pages/AdminSettings.tsx

@@ -225,7 +225,7 @@ export default function AdminSettings() {
   return (
     <>
       {/* Mobile Layout */}
-      <div className="space-y-4 lg:hidden">
+      <div className="space-y-4 pb-4 lg:hidden">
         <SettingsMobileTabs
           activeSection={activeSection}
           setActiveSection={setActiveSection}