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/users/[id]/page.tsx

@@ -8,6 +8,7 @@ import {
   setRank,
 } from "@/actions/admin-users";
 import { InfoItem, StatusCard } from "@/components/admin/dashboard";
+import { User } from "lucide-react";
 import { prisma } from "@/lib/prisma";
 
 export const dynamic = "force-dynamic";
@@ -31,13 +32,18 @@ export default async function AdminUserDetail({
 
   return (
     <main>
-      <p className="muted">
+      <p className="text-sm text-gray-500 dark:text-gray-400 mb-2">
         <Link href="/admin/users">← Users</Link>
       </p>
-      <h1>{user.username}</h1>
-      <p className="muted" style={{ marginTop: "-0.4rem" }}>
-        {user.motto ? user.motto : "No motto set."}
-      </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">
+          <User size={20} className="text-[var(--color-primary)]" />
+        </div>
+        <div>
+          <h1 className="m-0 text-xl font-extrabold text-[var(--color-text)]">{user.username}</h1>
+          <p className="m-0 text-xs text-[var(--color-text-muted)] mt-0.5">{user.motto ? user.motto : "No motto set."}</p>
+        </div>
+      </div>
 
       <div className="grid grid-cols-[repeat(auto-fit,minmax(180px,1fr))] gap-3.5 mb-6">
         <StatusCard label="User ID" value={user.id} icon="🆔" />
@@ -52,7 +58,7 @@ export default async function AdminUserDetail({
       </div>
 
       <section className="mt-6">
-        <h2>Overview</h2>
+        <h2 className="admin-section-title">Overview</h2>
         <div className="grid grid-cols-[repeat(auto-fit,minmax(150px,1fr))] gap-2.5">
           <InfoItem label="Username" value={user.username} />
           <InfoItem
@@ -70,11 +76,11 @@ export default async function AdminUserDetail({
       </section>
 
       <section className="mt-6">
-        <h2>Actions</h2>
+        <h2 className="admin-section-title">Actions</h2>
         <div className="grid cols-2">
-          <form action={giveCurrency} className="card">
+          <form action={giveCurrency} className="admin-card">
             <input type="hidden" name="userId" value={user.id} />
-            <h3 style={{ marginTop: 0 }}>Give currency</h3>
+            <h3 className="text-sm font-bold text-[var(--color-text)] m-0 mb-3">Give currency</h3>
             <select name="type">
               <option value="credits">Credits</option>
               <option value="duckets">Duckets</option>
@@ -87,37 +93,37 @@ export default async function AdminUserDetail({
             </button>
           </form>
 
-          <form action={setMotto} className="card">
+          <form action={setMotto} className="admin-card">
             <input type="hidden" name="userId" value={user.id} />
-            <h3 style={{ marginTop: 0 }}>Set motto</h3>
+            <h3 className="text-sm font-bold text-[var(--color-text)] m-0 mb-3">Set motto</h3>
             <input name="motto" defaultValue={user.motto} maxLength={127} />{" "}
             <button type="submit" className="btn btn-primary">
               Save
             </button>
           </form>
 
-          <form action={setRank} className="card">
+          <form action={setRank} className="admin-card">
             <input type="hidden" name="userId" value={user.id} />
-            <h3 style={{ marginTop: 0 }}>Set rank</h3>
+            <h3 className="text-sm font-bold text-[var(--color-text)] m-0 mb-3">Set rank</h3>
             <input name="rank" type="number" min={1} defaultValue={user.rank} />{" "}
             <button type="submit" className="btn btn-primary">
               Set
             </button>
           </form>
 
-          <form action={alertUser} className="card">
+          <form action={alertUser} className="admin-card">
             <input type="hidden" name="userId" value={user.id} />
-            <h3 style={{ marginTop: 0 }}>Alert</h3>
+            <h3 className="text-sm font-bold text-[var(--color-text)] m-0 mb-3">Alert</h3>
             <input name="message" placeholder="Message" />{" "}
             <button type="submit" className="btn btn-primary">
               Send
             </button>
           </form>
 
-          <form action={disconnectUser} className="card">
+          <form action={disconnectUser} className="admin-card">
             <input type="hidden" name="userId" value={user.id} />
             <input type="hidden" name="username" value={user.username} />
-            <h3 style={{ marginTop: 0 }}>Disconnect</h3>
+            <h3 className="text-sm font-bold text-[var(--color-text)] m-0 mb-3">Disconnect</h3>
             <button type="submit" className="btn btn-danger">
               Disconnect from hotel
             </button>