chore: remove experimental tags from themes, plugins, and sender favicons settings

components/settings/settings-section.tsx

@@ -1,29 +1,16 @@
 import { ReactNode } from 'react';
-import { Lock, FlaskConical } from 'lucide-react';
+import { Lock } from 'lucide-react';
 import { cn } from '@/lib/utils';
 
 interface SettingsSectionProps {
   title: string;
   description?: string;
   children: ReactNode;
-  experimental?: boolean;
-  experimentalDescription?: string;
 }
 
-export function SettingsSection({ title, description, children, experimental, experimentalDescription }: SettingsSectionProps) {
+export function SettingsSection({ title, description, children }: SettingsSectionProps) {
   return (
     <div data-search-label={title} className="space-y-4">
-      {experimental && (
-        <div className="flex gap-3 rounded-lg border border-amber-300 bg-amber-50 p-3 dark:border-amber-700 dark:bg-amber-950/30">
-          <FlaskConical className="w-5 h-5 text-amber-600 dark:text-amber-400 mt-0.5 shrink-0" />
-          <div>
-            <p className="text-sm font-medium text-amber-800 dark:text-amber-300">Experimental Feature</p>
-            {experimentalDescription && (
-              <p className="text-xs text-amber-700 dark:text-amber-400/80 mt-1">{experimentalDescription}</p>
-            )}
-          </div>
-        </div>
-      )}
       <div>
         <h3 className="text-lg font-medium text-foreground">{title}</h3>
         {description && (