feat: add web master-agent chat menu

src/app/conversations/[projectId]/page.tsx

@@ -5,6 +5,7 @@ import {
   AppShell,
   ChatBubble,
   ChatComposer,
+  MasterAgentChatMenu,
   MasterIdentityPill,
   PageNav,
   ProjectHeaderActions,
@@ -45,7 +46,18 @@ export default async function ProjectChatPage({
       <PageNav
         title={detail.project.name}
         backHref="/conversations"
-        rightNode={detail.masterIdentity ? <MasterIdentityPill identity={detail.masterIdentity} /> : undefined}
+        rightNode={
+          detail.masterIdentity ? (
+            <div className="flex items-center gap-2">
+              <MasterIdentityPill identity={detail.masterIdentity} />
+              {detail.project.id === "master-agent" ? (
+                <MasterAgentChatMenu projectId={detail.project.id} />
+              ) : null}
+            </div>
+          ) : detail.project.id === "master-agent" ? (
+            <MasterAgentChatMenu projectId={detail.project.id} />
+          ) : undefined
+        }
       />
       <div className="flex min-h-0 flex-1 flex-col px-[18px] pb-0">
         <div className="text-[12px] text-[#8C8C8C]">