feat: refactor sign-in prompts to use SignedOutPanel component

frontend/src/app/agents/new/page.tsx

@@ -5,7 +5,7 @@ export const dynamic = "force-dynamic";
 import { useState } from "react";
 import { useRouter } from "next/navigation";
 
-import { SignInButton, SignedIn, SignedOut, useAuth } from "@/auth/clerk";
+import { SignedIn, SignedOut, useAuth } from "@/auth/clerk";
 
 import { ApiError } from "@/api/mutator";
 import {
@@ -18,6 +18,8 @@ import {
   useGetMyMembershipApiV1OrganizationsMeMemberGet,
 } from "@/api/generated/organizations/organizations";
 import type { BoardRead } from "@/api/generated/model";
+import { AdminOnlyNotice } from "@/components/auth/AdminOnlyNotice";
+import { SignedOutPanel } from "@/components/auth/SignedOutPanel";
 import { DashboardSidebar } from "@/components/organisms/DashboardSidebar";
 import { DashboardShell } from "@/components/templates/DashboardShell";
 import { Button } from "@/components/ui/button";
@@ -170,20 +172,11 @@ export default function NewAgentPage() {
   return (
     <DashboardShell>
       <SignedOut>
-        <div className="col-span-2 flex min-h-[calc(100vh-64px)] items-center justify-center bg-slate-50 p-10 text-center">
-          <div className="rounded-xl border border-slate-200 bg-white px-8 py-6 shadow-sm">
-            <p className="text-sm text-slate-600">
-              Sign in to create an agent.
-            </p>
-            <SignInButton
-              mode="modal"
-              forceRedirectUrl="/agents/new"
-              signUpForceRedirectUrl="/agents/new"
-            >
-              <Button className="mt-4">Sign in</Button>
-            </SignInButton>
-          </div>
-        </div>
+        <SignedOutPanel
+          message="Sign in to create an agent."
+          forceRedirectUrl="/agents/new"
+          signUpForceRedirectUrl="/agents/new"
+        />
       </SignedOut>
       <SignedIn>
         <DashboardSidebar />
@@ -201,9 +194,7 @@ export default function NewAgentPage() {
 
           <div className="p-8">
             {!isAdmin ? (
-              <div className="rounded-xl border border-slate-200 bg-white px-6 py-5 text-sm text-slate-600 shadow-sm">
-                Only organization owners and admins can create agents.
-              </div>
+              <AdminOnlyNotice message="Only organization owners and admins can create agents." />
             ) : (
               <form
                 onSubmit={handleSubmit}