feat(ui): add workspace customization and simplify navigation

components/layout/portal-shell.tsx

@@ -2,10 +2,12 @@
 
 import { AppShell, type AppShellBranding } from "@/components/layout/app-shell";
 import { portalSidebarData } from "@/config/portal-sidebar";
+import type { ColorMode } from "@/lib/color-mode";
 
 type PortalShellProps = {
   branding: AppShellBranding;
   children: React.ReactNode;
+  colorMode: ColorMode;
   user: {
     email: string;
     displayName: string;
@@ -15,10 +17,11 @@ type PortalShellProps = {
   progress?: number;
 };
 
-export function PortalShell({ branding, children, user, progress }: PortalShellProps) {
+export function PortalShell({ branding, children, colorMode, user, progress }: PortalShellProps) {
   return (
     <AppShell
       branding={branding}
+      colorMode={colorMode}
       homeHref="/portal"
       navGroups={portalSidebarData}
       settingsHref="/portal/settings"