fix: use runtime env vars instead of NEXT_PUBLIC_ build-time vars

NEXT_PUBLIC_* env vars are statically replaced at build time by
the Next.js compiler, even in server components. Since these
variables are only read in server components (and passed as props
to client components), they don't need the NEXT_PUBLIC_ prefix.

Renamed to KAGENT_UI_HEADLINE and KAGENT_UI_SUBTITLE so they are
read from process.env at request time, making them truly
configurable without rebuilding the Docker image.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Signed-off-by: Optimus (AI Agent) <agent@fulcria.com>

Author: optimus-fulcria

ui/src/app/agents/[namespace]/[name]/chat/[chatId]/page.tsx

@@ -9,6 +9,6 @@ export default async function ChatPageView({ params }: { params: Promise<{ name:
     selectedAgentName={name}
     selectedNamespace={namespace}
     sessionId={chatId}
-    headline={process.env.NEXT_PUBLIC_HEADLINE}
+    headline={process.env.KAGENT_UI_HEADLINE}
   />;
 }

ui/src/app/agents/[namespace]/[name]/chat/page.tsx

@@ -5,6 +5,6 @@ export const dynamic = "force-dynamic";
 // This page component receives props (like params) from the Layout
 export default async function ChatAgentPage({ params }: { params: Promise<{ name: string, namespace: string }> }) {
   const { name, namespace } = await params;
-  const headline = process.env.NEXT_PUBLIC_HEADLINE;
+  const headline = process.env.KAGENT_UI_HEADLINE;
   return <ChatInterface selectedAgentName={name} selectedNamespace={namespace} headline={headline} />;
 }

ui/src/app/agents/page.tsx

@@ -3,6 +3,6 @@ import AgentList from "@/components/AgentList";
 export const dynamic = "force-dynamic";
 
 export default async function AgentListPage() {
-  const subtitle = process.env.NEXT_PUBLIC_SUBTITLE;
+  const subtitle = process.env.KAGENT_UI_SUBTITLE;
   return <AgentList subtitle={subtitle} />;
 }

ui/src/app/page.tsx

@@ -3,6 +3,6 @@ import AgentList from "@/components/AgentList";
 export const dynamic = "force-dynamic";
 
 export default async function AgentListPage() {
-  const subtitle = process.env.NEXT_PUBLIC_SUBTITLE;
+  const subtitle = process.env.KAGENT_UI_SUBTITLE;
   return <AgentList subtitle={subtitle} />;
 }