ads/chrome: banners on /search and /reading-list; wrap /contributor with site chrome

- /search and /reading-list already had Header + Footer; add a
    single in-content 728x90 banner at the bottom of each main column
    (gated on ADS_728X90.length > 0, hidden on mobile).

  - /contributor was a bare dashboard with sidebar + main, no site
    chrome at all. Wrap it in the standard Header + Footer; drop the
    inner sidebar/main wrapper from min-h-screen to a natural-height
    flex so the dashboard sits below the header instead of competing
    with it for full viewport. Header brings the site-wide 728x90
    leaderboard with it, so contributors see the same ad inventory
    as the public site without a second in-content banner cluttering
    the dashboard panes.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/app/contributor/page.tsx

@@ -5,6 +5,8 @@ import React, { useState, useEffect, useCallback } from 'react';
 import { useAuth } from '@/contexts/AuthContext';
 import { useRouter } from 'next/navigation';
 import { createClient } from '@/lib/supabase/client';
+import Header from '@/components/Header';
+import Footer from '@/components/Footer';
 
 // ─── Types ────────────────────────────────────────────────────────────────────
 
@@ -246,6 +248,7 @@ export default function ContributorDashboard() {
 
   return (
     <div className="min-h-screen bg-[#0a0a0a] text-white">
+      <Header />
       {notification && (
         <div className={`fixed top-4 right-4 z-50 max-w-sm px-5 py-3 rounded-lg text-sm font-medium shadow-lg ${
           notification.type === 'success' ? 'bg-green-500/20 border border-green-500/40 text-green-300' : 'bg-red-500/20 border border-red-500/40 text-red-300'
@@ -254,7 +257,7 @@ export default function ContributorDashboard() {
         </div>
       )}
 
-      <div className="flex min-h-screen">
+      <div className="flex">
         {/* Sidebar */}
         <aside className="w-60 bg-[#111] border-r border-[#222] flex flex-col">
           <div className="p-5 border-b border-[#222]">
@@ -569,6 +572,7 @@ export default function ContributorDashboard() {
           )}
         </main>
       </div>
+      <Footer />
     </div>
   );
 }

src/app/reading-list/page.tsx

@@ -4,6 +4,8 @@ import Link from "next/link";
 import AppImage from "@/components/ui/AppImage";
 import Header from "@/components/Header";
 import Footer from "@/components/Footer";
+import AdImage from "@/components/AdImage";
+import { ADS_728X90, shuffle } from "@/lib/ads";
 import { createClient } from "@/lib/supabase/client";
 
 interface SavedArticle {
@@ -309,6 +311,13 @@ export default function ReadingListPage() {
             </div>
           )}
         </div>
+
+        {/* In-content 728x90 banner */}
+        {ADS_728X90.length > 0 && (
+          <div className="max-w-container mx-auto px-4 mt-10 mb-6 hidden md:flex justify-center" aria-label="Advertisement">
+            <AdImage ad={shuffle(ADS_728X90)[0]} page="reading-list" />
+          </div>
+        )}
       </main>
       <Footer />
     </>

src/app/search/page.tsx

@@ -3,6 +3,8 @@ import Link from "next/link";
 import Header from "@/components/Header";
 import Footer from "@/components/Footer";
 import AppImage from "@/components/ui/AppImage";
+import AdImage from "@/components/AdImage";
+import { ADS_728X90, shuffle } from "@/lib/ads";
 import { searchLegacyArticles } from "@/lib/articles/legacy-source";
 
 export const revalidate = 60;
@@ -93,6 +95,13 @@ export default async function SearchPage({ searchParams }: SearchPageProps) {
             );
           })}
         </div>
+
+        {/* In-content 728x90 banner */}
+        {ADS_728X90.length > 0 && (
+          <div className="mt-10 hidden md:flex justify-center" aria-label="Advertisement">
+            <AdImage ad={shuffle(ADS_728X90)[0]} page="search" />
+          </div>
+        )}
       </main>
       <Footer />
     </div>