feat: add live Codex research chat and reusable deck sources

src/components/app-shell.tsx

@@ -2,21 +2,25 @@ import { Icon } from './icon'
 
 export function AppShell({
   sidebar,
+  researchChat,
   children,
 }: {
   sidebar: React.ReactNode
+  researchChat: React.ReactNode
   children: React.ReactNode
 }) {
   return (
     <main className="app app-deck">
-      <aside className="app-sidebar" aria-label="デッキ管理">
-        <p className="brand">
-          <Icon name="columns" />
-          <span>Twitter Lite</span>
-        </p>
-        {sidebar}
-      </aside>
-      <section className="reader">{children}</section>
+      {researchChat}
+      <section className="reader">
+        <section className="deck-toolbar" aria-label="デッキ管理">
+          <p className="brand" title="Twitter Lite">
+            <Icon name="columns" />
+          </p>
+          {sidebar}
+        </section>
+        {children}
+      </section>
     </main>
   )
 }