disable graph selector dropdown UI, set with env by default

src/components/navbar/index.tsx

@@ -14,7 +14,6 @@ import {
 } from "@/components/ui/navigation-menu";
 import { Sheet, SheetContent, SheetTrigger } from "@/components/ui/sheet";
 import { UserInfoSignOut } from "@/features/user-auth-status";
-import { GraphDropdown } from "@/features/graph-dropdown";
 import { CreditBalance } from "@/components/credits/credit-balance";
 
 export function Navbar() {
@@ -53,7 +52,6 @@ export function Navbar() {
           <div className="hidden items-center space-x-3 md:flex">
             <CreditBalance />
             <UserInfoSignOut />
-            <GraphDropdown />
           </div>
           <Sheet>
             <SheetTrigger asChild>

src/features/graph-dropdown/index.tsx

@@ -12,6 +12,14 @@ import { getDeployments } from "@/lib/environment/deployments";
 import { Deployment } from "@/app/types/deployment";
 import { Badge } from "@/components/ui/badge";
 
+/**
+ * GraphDropdown component - Currently not in use
+ *
+ * This component has been removed from the UI in favor of using
+ * process.env.NEXT_PUBLIC_ASSISTANT_ID to set the graph behind the scenes.
+ * The Stream and Thread providers automatically fall back to the environment
+ * variable when no assistantId query state is present.
+ */
 export function GraphDropdown() {
   const { session } = useAuthContext();
   const jwt = session?.accessToken;