fix: align board page and metadata error handling with layout

- resolve the session before handling board lookup errors so anonymous
  users still get the /auth/login redirect on a missing home board
- map both NOT_FOUND and BAD_REQUEST to a 404 in the board page and in
  generateMetadataAsync, matching the layout behavior
- clarify the getAvailability MCP description to mention demo-mode
  availability

apps/nextjs/src/app/[locale]/boards/(content)/_creator.tsx

@@ -1,6 +1,6 @@
 import type { Metadata } from "next";
 import { Suspense } from "react";
-import { notFound } from "next/navigation";
+import { notFound, redirect } from "next/navigation";
 import { TRPCError } from "@trpc/server";
 
 // Placed here because gridstack styles are used for board content
@@ -50,16 +50,24 @@ export const createBoardContentPage = <TParams extends Record<string, unknown>>(
     page: async ({ params }: { params: Promise<TParams> }) => {
       const resolvedParams = await params;
       const queryClient = getQueryClient();
+      const session = await auth();
 
-      const [board, session] = await Promise.all([
-        getInitialBoard(resolvedParams).catch((error) => {
-          if (error instanceof TRPCError && (error.code === "NOT_FOUND" || error.code === "BAD_REQUEST")) {
-            notFound();
+      const board = await getInitialBoard(resolvedParams).catch((error) => {
+        if (error instanceof TRPCError && error.code === "NOT_FOUND") {
+          if (!session) {
+            logger.debug("No home board found for anonymous user, redirecting to login");
+            redirect("/auth/login");
           }
-          throw error;
-        }),
-        auth(),
-      ]);
+
+          notFound();
+        }
+
+        if (error instanceof TRPCError && error.code === "BAD_REQUEST") {
+          notFound();
+        }
+
+        throw error;
+      });
 
       const itemsMap = board.items.reduce((acc, item) => {
         const existing = acc.get(item.kind);
@@ -119,8 +127,11 @@ export const createBoardContentPage = <TParams extends Record<string, unknown>>(
           },
         };
       } catch (error) {
-        // Ignore not found errors and return empty metadata
-        if (error instanceof TRPCError && error.code === "NOT_FOUND") {
+        // Ignore not found and bad-request errors and return empty metadata
+        if (
+          error instanceof TRPCError &&
+          (error.code === "NOT_FOUND" || error.code === "BAD_REQUEST")
+        ) {
           return {};
         }
 

packages/api/src/router/assistant.ts

@@ -444,7 +444,8 @@ export const assistantRouter = createTRPCRouter({
     .meta({
       mcp: {
         enabled: true,
-        description: "Check whether Homarr Assistant is enabled and configured for the current user",
+        description:
+          "Check whether Homarr Assistant is enabled and configured, or available in demo mode, for the current user",
       },
     })
     .query(async ({ ctx }) => {