diff --git a/modules/Admin/src/SimpleModule.Admin/Pages/Admin/Hub.tsx b/modules/Admin/src/SimpleModule.Admin/Pages/Admin/Hub.tsx
index b5fcb315..f2d34020 100644
--- a/modules/Admin/src/SimpleModule.Admin/Pages/Admin/Hub.tsx
+++ b/modules/Admin/src/SimpleModule.Admin/Pages/Admin/Hub.tsx
@@ -124,7 +124,19 @@ function CardIcon({ icon }: { icon: string }) {
   );
 }
 
-export default function Hub() {
+interface HubProps {
+  availableUrls?: string[];
+}
+
+export default function Hub({ availableUrls }: HubProps) {
+  const available = new Set((availableUrls ?? []).map((u) => u.toLowerCase()));
+  const visibleGroups = groups
+    .map((group) => ({
+      ...group,
+      items: group.items.filter((i) => available.has(i.url.toLowerCase())),
+    }))
+    .filter((group) => group.items.length > 0);
+
   return (
     <PageShell
       title="Administration"
@@ -132,7 +144,7 @@ export default function Hub() {
       breadcrumbs={[{ label: 'Home', href: '/' }, { label: 'Admin' }]}
     >
       <div className="space-y-8">
-        {groups.map((group) => (
+        {visibleGroups.map((group) => (
           <section key={group.title}>
             <h2 className="text-sm font-semibold uppercase tracking-wider text-text-muted mb-3">
               {group.title}
diff --git a/modules/Admin/src/SimpleModule.Admin/Pages/Admin/HubEndpoint.cs b/modules/Admin/src/SimpleModule.Admin/Pages/Admin/HubEndpoint.cs
index d388e112..8e24e868 100644
--- a/modules/Admin/src/SimpleModule.Admin/Pages/Admin/HubEndpoint.cs
+++ b/modules/Admin/src/SimpleModule.Admin/Pages/Admin/HubEndpoint.cs
@@ -10,9 +10,54 @@ public class HubEndpoint : IViewEndpoint
 {
     public const string Route = AdminConstants.Routes.Hub;
 
+    // Must stay in sync with the `url` values in Hub.tsx's `groups`. URLs not
+    // present in the app's endpoint table are filtered out so the hub doesn't
+    // surface 404 tiles for peer modules that aren't installed.
+    private static readonly string[] CandidateUrls =
+    [
+        "/admin/users",
+        "/admin/roles",
+        "/openiddict/clients",
+        "/tenants/manage",
+        "/pages/manage",
+        "/email/templates",
+        "/email/history",
+        "/settings/menus",
+        "/feature-flags/manage",
+        "/rate-limiting/manage",
+        "/admin/jobs",
+        "/audit-logs/browse",
+        "/settings/manage",
+    ];
+
+    private string[]? _availableUrls;
+
     public void Map(IEndpointRouteBuilder app)
     {
-        app.MapGet(Route, () => Inertia.Render("Admin/Admin/Hub"))
+        app.MapGet(
+                Route,
+                (EndpointDataSource endpointDataSource) =>
+                {
+                    _availableUrls ??= ComputeAvailableUrls(endpointDataSource);
+                    return Inertia.Render(
+                        "Admin/Admin/Hub",
+                        new { availableUrls = _availableUrls }
+                    );
+                }
+            )
             .RequireAuthorization(policy => policy.RequireRole("Admin"));
     }
+
+    private static string[] ComputeAvailableUrls(EndpointDataSource endpointDataSource)
+    {
+        var registered = new HashSet<string>(StringComparer.OrdinalIgnoreCase);
+        foreach (var endpoint in endpointDataSource.Endpoints)
+        {
+            if (endpoint is RouteEndpoint route)
+            {
+                registered.Add("/" + route.RoutePattern.RawText?.TrimStart('/'));
+            }
+        }
+        return CandidateUrls.Where(registered.Contains).ToArray();
+    }
 }
diff --git a/packages/SimpleModule.Client/src/define-module-config.ts b/packages/SimpleModule.Client/src/define-module-config.ts
index 80a430f0..16d2713e 100644
--- a/packages/SimpleModule.Client/src/define-module-config.ts
+++ b/packages/SimpleModule.Client/src/define-module-config.ts
@@ -1,9 +1,60 @@
+import { readdirSync, readFileSync } from 'node:fs';
 import { basename, resolve } from 'node:path';
 import react from '@vitejs/plugin-react';
 import type { UserConfig } from 'vite';
 import { defineConfig } from 'vite';
 import { defaultVendors } from './vite-plugin-vendor.ts';
 
+/**
+ * Detect the case-insensitive filesystem trap where `Pages/index.ts` (the
+ * framework-required barrel) sits next to a page like `Pages/Index.tsx` and
+ * the barrel uses an extension-less dynamic import (`() => import('./Index')`).
+ *
+ * On macOS/Windows, Rolldown resolves `./Index` back to `./index.ts` (the
+ * barrel itself), producing a self-referential chunk that throws at runtime
+ * with `Cannot assign to property 'layout' of [object Module]`.
+ *
+ * Throw early with a clear, actionable error.
+ */
+function assertNoBarrelCollision(dir: string): void {
+  const pagesDir = resolve(dir, 'Pages');
+
+  let entries: string[];
+  try {
+    entries = readdirSync(pagesDir);
+  } catch {
+    return;
+  }
+  if (!entries.includes('index.ts')) return;
+
+  const offending = entries.find((f) => /^index\.(tsx|jsx|js)$/i.test(f) && f !== 'index.ts');
+  if (!offending) return;
+
+  let barrel: string;
+  try {
+    barrel = readFileSync(resolve(pagesDir, 'index.ts'), 'utf8');
+  } catch {
+    return;
+  }
+
+  // Match extension-less dynamic imports whose specifier case-insensitively
+  // resolves to the barrel itself (`import('./Index')` next to `index.ts`).
+  // On case-insensitive filesystems Rolldown silently picks `./index.ts`
+  // (the barrel) rather than the sibling `./Index.tsx`, producing a chunk
+  // that re-exports the barrel and crashes at runtime.
+  if (!/import\(\s*['"]\.\/index['"]\s*\)/i.test(barrel)) return;
+
+  const specifier = offending.replace(/\.(tsx|jsx|js)$/i, '');
+  throw new Error(
+    `[@simplemodule/client] Pages/index.ts contains \`import('./${specifier}')\` which collides ` +
+      `with the barrel on case-insensitive filesystems (macOS/Windows). Rolldown will silently ` +
+      `emit a self-referential chunk and the page will fail at runtime with ` +
+      `"Cannot assign to property 'layout' of [object Module]".\n\n` +
+      `Fix: use the explicit file extension, e.g. \`import('./${offending}')\`, or rename ` +
+      `Pages/${offending} to a name that does not case-insensitively match 'index'.`,
+  );
+}
+
 /**
  * Unified Vite config for SimpleModule modules.
  *
@@ -20,6 +71,8 @@ import { defaultVendors } from './vite-plugin-vendor.ts';
  * ```
  */
 export function defineModuleConfig(dir: string): UserConfig {
+  assertNoBarrelCollision(dir);
+
   const name = basename(dir);
   const isDev = process.env.VITE_MODE !== 'prod';