fix(agency): permanently resolve double-sidebar race condition by cleanly redirecting agency workspaces from /projects to a dedicated /agency route

vibn-frontend/app/[workspace]/projects/page.tsx

@@ -2,7 +2,7 @@
 
 import { useEffect, useState } from "react";
 import { useSession } from "next-auth/react";
-import { useParams } from "next/navigation";
+import { useParams, useRouter } from "next/navigation";
 import Link from "next/link";
 import { ProjectCreationModal } from "@/components/project-creation-modal";
 import {
@@ -17,7 +17,6 @@ import {
 } from "@/components/ui/alert-dialog";
 import { Loader2, Trash2 } from "lucide-react";
 import { toast } from "sonner";
-import AgencyDashboard from "../agency/page";
 
 interface ProjectWithStats {
   id: string;
@@ -109,11 +108,11 @@ function StatusTag({ status }: { status?: string }) {
 
 export default function ProjectsPage() {
   const params = useParams();
+  const router = useRouter();
   const workspace = params.workspace as string;
   const { data: session, status } = useSession();
 
   const [projects, setProjects] = useState<ProjectWithStats[]>([]);
-  const [isAgency, setIsAgency] = useState<boolean | null>(null);
   const [loading, setLoading] = useState(true);
   const [loadError, setLoadError] = useState<string | null>(null);
   const [showNew, setShowNew] = useState(false);
@@ -134,10 +133,9 @@ export default function ProjectsPage() {
       });
       if (wsRes.ok) {
         const wsData = await wsRes.json();
-        setIsAgency(wsData.isAgency);
         if (wsData.isAgency) {
-          setLoading(false);
-          return; // Stop fetching projects if it's an agency, let AgencyDashboard handle its own data
+          router.replace(`/${workspace}/agency`);
+          return;
         }
       }
 
@@ -209,10 +207,6 @@ export default function ProjectsPage() {
     return `${projects.length} total · ${parts.join(" · ")}`;
   };
 
-  if (isAgency === true) {
-    return <AgencyDashboard />;
-  }
-
   return (
     <div
       className="vibn-enter"