Convert admin pages to new Tailwind design pattern

- Replace 'card' class with 'admin-card' (gradient cards, dark mode support)
- Replace 'muted' class with consistent Tailwind muted states
- Standardize page headers with gradient backgrounds and Lucide icons
- Convert all inline styles to Tailwind classes
- Add admin-page CSS helpers (admin-card, admin-filter-bar, admin-section-title)
- Apply pattern to all 42 admin pages (was only 6 before)
- Zero TypeScript errors, production builds successfully

Co-authored-by: openhands <[email protected]>

src/app/admin/radio/moderation/page.tsx

@@ -2,6 +2,7 @@ import Link from 'next/link';
 import { prisma } from '@/lib/prisma';
 import { deleteShout } from '@/actions/admin-radio-moderation';
 import { StatusCard } from '@/components/admin/dashboard';
+import { Shield } from 'lucide-react';
 
 export const dynamic = 'force-dynamic';
 
@@ -37,7 +38,7 @@ export default async function AdminRadioModerationPage() {
 
   return (
     <main>
-      <nav className="muted" style={{ marginBottom: '0.5rem' }}>
+      <nav className="text-xs text-gray-500 dark:text-gray-400 mb-2">
         <Link href="/admin/radio">Radio</Link> ·{' '}
         <Link href="/admin/radio/moderation">Moderation</Link> ·{' '}
         <Link href="/admin/radio/settings">Settings</Link> ·{' '}
@@ -46,19 +47,24 @@ export default async function AdminRadioModerationPage() {
         <Link href="/admin/radio/history">History</Link>
       </nav>
 
-      <h1>DJ Moderation</h1>
-      <p className="muted" style={{ marginTop: '-0.4rem' }}>
-        Review and remove radio shouts (50 most recent).
-      </p>
+      <div className="flex items-center gap-3 mb-6">
+        <div className="w-10 h-10 rounded-xl bg-gradient-to-br from-[var(--color-primary)]/20 to-[var(--color-primary)]/5 grid place-items-center">
+          <Shield size={20} className="text-[var(--color-primary)]" />
+        </div>
+        <div>
+          <h1 className="m-0 text-xl font-extrabold text-[var(--color-text)]">DJ Moderation</h1>
+          <p className="m-0 text-xs text-[var(--color-text-muted)] mt-0.5">Review and remove radio shouts (50 most recent).</p>
+        </div>
+      </div>
 
       <div className="grid grid-cols-[repeat(auto-fit,minmax(180px,1fr))] gap-3.5 mb-6">
         <StatusCard label="Recent shouts" value={shouts.length} icon="📣" />
       </div>
 
       <section className="mt-6">
-        <h2>Recent Shouts ({shouts.length})</h2>
+        <h2 className="admin-section-title">Recent Shouts ({shouts.length})</h2>
         {shouts.length === 0 ? (
-          <p className="muted">No shouts to moderate.</p>
+          <div className="admin-empty">No shouts to moderate.</div>
         ) : (
           <table>
             <thead>
@@ -76,7 +82,7 @@ export default async function AdminRadioModerationPage() {
                   <td>{String(s.id)}</td>
                   <td>{String(s.userId)}</td>
                   <td>{s.message}</td>
-                  <td className="muted">{formatDate(s.createdAt)}</td>
+                  <td className="text-sm text-gray-500 dark:text-gray-400 whitespace-nowrap">{formatDate(s.createdAt)}</td>
                   <td>
                     <form action={deleteShout}>
                       <input type="hidden" name="id" value={String(s.id)} />