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/permissions/page.tsx

@@ -5,6 +5,7 @@ import {
 } from "@/actions/admin-permissions";
 import { StatusCard } from "@/components/admin/dashboard";
 import { prisma } from "@/lib/prisma";
+import { Shield } from "lucide-react";
 
 export const dynamic = "force-dynamic";
 
@@ -34,20 +35,24 @@ export default async function AdminPermissions() {
 
   return (
     <main>
-      <h1>Permissions</h1>
-      <p className="muted" style={{ marginTop: "-0.4rem" }}>
-        CMS-owned permissions (<code>website_permissions</code>). Each entry maps
-        a permission name to the minimum rank allowed to use it.
-      </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)]">Permissions</h1>
+          <p className="m-0 text-xs text-[var(--color-text-muted)] mt-0.5">CMS-owned permissions (<code>website_permissions</code>). Each entry maps a permission name to the minimum rank allowed to use it.</p>
+        </div>
+      </div>
 
       <div className="grid grid-cols-[repeat(auto-fit,minmax(180px,1fr))] gap-3.5 mb-6">
         <StatusCard label="Permissions" value={permissions.length} icon="🔑" />
         <StatusCard label="Highest min rank" value={highestRank} icon="🎖️" />
       </div>
 
-      <form action={createPermission} className="card" style={{ marginBottom: "1.5rem" }}>
-        <h3 style={{ marginTop: 0 }}>Add / overwrite permission</h3>
-        <div style={{ display: "flex", gap: "0.5rem", flexWrap: "wrap" }}>
+      <form action={createPermission} className="admin-card mb-6">
+        <h3 className="text-sm font-bold text-[var(--color-text)] m-0 mb-3">Add / overwrite permission</h3>
+        <div className="flex gap-2 flex-wrap">
           <input name="permission" placeholder="permission" required maxLength={255} />
           <input
             name="minRank"
@@ -55,12 +60,12 @@ export default async function AdminPermissions() {
             min={0}
             placeholder="min rank"
             defaultValue={1}
-            style={{ width: 110 }}
+            className="w-[110px]"
           />
           <input
             name="description"
             placeholder="description"
-            style={{ flex: 1, minWidth: 160 }}
+            className="flex-1 min-w-[160px]"
           />
           <button type="submit" className="btn btn-primary">
             Save
@@ -69,11 +74,11 @@ export default async function AdminPermissions() {
       </form>
 
       <section className="mt-6">
-        <h2>Permissions ({permissions.length})</h2>
+        <h2 className="admin-section-title">Permissions ({permissions.length})</h2>
         {permissions.length === 0 ? (
-          <p className="muted">No permissions found.</p>
+          <div className="admin-empty">No permissions found.</div>
         ) : (
-          <div style={{ overflowX: "auto" }}>
+          <div className="overflow-x-auto">
             <table>
               <thead>
                 <tr>
@@ -87,7 +92,7 @@ export default async function AdminPermissions() {
               <tbody>
                 {permissions.map((p) => (
                   <tr key={String(p.id)}>
-                    <td className="muted">{String(p.id)}</td>
+                    <td className="text-sm text-gray-500 dark:text-gray-400 whitespace-nowrap">{String(p.id)}</td>
                     <td>
                       <form
                         id={`perm-${String(p.id)}`}
@@ -105,7 +110,7 @@ export default async function AdminPermissions() {
                         type="number"
                         min={0}
                         defaultValue={p.minRank}
-                        style={{ width: 90 }}
+                        className="w-[90px]"
                       />
                     </td>
                     <td>
@@ -113,10 +118,10 @@ export default async function AdminPermissions() {
                         form={`perm-${String(p.id)}`}
                         name="description"
                         defaultValue={p.description ?? ""}
-                        style={{ width: "100%" }}
+                        className="w-full"
                       />
                     </td>
-                    <td style={{ display: "flex", gap: "0.5rem" }}>
+                    <td className="flex gap-2">
                       <button
                         type="submit"
                         form={`perm-${String(p.id)}`}