feat(tracker-web): adopt @bytelyst/ui AppShell nav shell (UX-8)

Replace the hand-rolled sticky top nav in the dashboard layout with the
shared AppShell (AppShellSidebar/AppShellNav/AppShellNavItem/AppShellMain/
AppShellSkipLink + mobile toggle + overlay). The sidebar keeps the
ProductSwitcher, user email and Sign out, and adds a ⌘K trigger (replays
the global hotkey) and a theme toggle. Nav items use aria-current for the
active route and client-side navigation; the skip-link targets the
focusable main region. AppShell exports are routed through the Primitives
adapter (CC.6 ratchet) and covered by the export-presence test.

AppShellPageHeader is intentionally not used so the per-page PageHeader
(UX-10) remains the single h1 per route (no duplicate headings).

Generated with [Devin](https://cli.devin.ai/docs)

Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

dashboards/tracker-web/src/__tests__/primitives-adapter.exports.test.ts

@@ -83,6 +83,16 @@ const EXPECTED_EXPORTS = [
   'DataListItem',
   'DataListMeta',
   'Timeline',
+  // UX-8 AppShell additions
+  'AppShell',
+  'AppShellMain',
+  'AppShellMobileToggle',
+  'AppShellNav',
+  'AppShellNavItem',
+  'AppShellOverlay',
+  'AppShellPageHeader',
+  'AppShellSidebar',
+  'AppShellSkipLink',
 ] as const;
 
 describe('Primitives adapter — export presence', () => {

dashboards/tracker-web/src/app/dashboard/layout.tsx

@@ -1,9 +1,21 @@
 'use client';
 
-import { useEffect } from 'react';
-import { useRouter } from 'next/navigation';
+import { useEffect, useState } from 'react';
+import { useRouter, usePathname } from 'next/navigation';
 import Link from 'next/link';
+import {
+  AppShell,
+  AppShellSkipLink,
+  AppShellMobileToggle,
+  AppShellOverlay,
+  AppShellSidebar,
+  AppShellNav,
+  AppShellNavItem,
+  AppShellMain,
+  Button,
+} from '@/components/ui/Primitives';
 import { useAuth } from '@/lib/auth-context';
+import { useTheme } from '@/lib/theme-context';
 import { ProductSwitcher } from '@/components/product-switcher';
 import { SystemBanners } from '@/components/system-banners';
 
@@ -13,9 +25,17 @@ const NAV_ITEMS = [
   { href: '/dashboard/board', label: 'Board' },
 ];
 
+/** Open the ⌘K command palette by replaying the global hotkey. */
+function openCommandPalette() {
+  window.dispatchEvent(new KeyboardEvent('keydown', { key: 'k', metaKey: true, ctrlKey: true }));
+}
+
 export default function DashboardLayout({ children }: { children: React.ReactNode }) {
   const { user, loading, logout } = useAuth();
+  const { theme, setTheme } = useTheme();
   const router = useRouter();
+  const pathname = usePathname();
+  const [navOpen, setNavOpen] = useState(false);
 
   useEffect(() => {
     if (!loading && !user) {
@@ -31,45 +51,71 @@ export default function DashboardLayout({ children }: { children: React.ReactNod
     );
   }
 
+  const go = (href: string) => (e: React.MouseEvent) => {
+    e.preventDefault();
+    setNavOpen(false);
+    router.push(href);
+  };
+
   return (
-    <div className="min-h-screen bg-background">
-      {/* Top nav bar */}
-      <header className="sticky top-0 z-50 border-b border-border bg-card/80 backdrop-blur-sm">
-        <div className="mx-auto flex h-14 max-w-7xl items-center justify-between px-4">
-          <div className="flex items-center gap-6">
-            <Link href="/dashboard" className="text-lg font-bold tracking-tight">
-              Tracker
-            </Link>
-            <nav className="flex items-center gap-1">
-              {NAV_ITEMS.map(item => (
-                <Link
-                  key={item.href}
-                  href={item.href}
-                  className="rounded-md px-3 py-1.5 text-sm font-medium text-muted-foreground transition-colors hover:bg-accent hover:text-accent-foreground"
-                >
-                  {item.label}
-                </Link>
-              ))}
-            </nav>
-          </div>
-          <div className="flex items-center gap-4">
+    <AppShell>
+      <AppShellSkipLink />
+      <AppShellMobileToggle open={navOpen} onClick={() => setNavOpen(o => !o)} />
+      <AppShellOverlay open={navOpen} onClick={() => setNavOpen(false)} />
+
+      <AppShellSidebar open={navOpen} label="Primary">
+        <div className="flex h-full flex-col gap-6 p-4">
+          <Link href="/dashboard" className="px-1 text-lg font-bold tracking-tight">
+            Tracker
+          </Link>
+
+          <AppShellNav>
+            {NAV_ITEMS.map(item => (
+              <AppShellNavItem
+                key={item.href}
+                href={item.href}
+                active={
+                  item.href === '/dashboard'
+                    ? pathname === item.href
+                    : pathname.startsWith(item.href)
+                }
+                onClick={go(item.href)}
+              >
+                {item.label}
+              </AppShellNavItem>
+            ))}
+          </AppShellNav>
+
+          <div className="mt-auto space-y-3">
             <ProductSwitcher />
-            <span className="text-sm text-muted-foreground">{user.email}</span>
-            <button
-              onClick={logout}
-              className="rounded-md px-3 py-1.5 text-sm font-medium text-muted-foreground transition-colors hover:bg-accent hover:text-accent-foreground"
+            <Button
+              variant="secondary"
+              size="sm"
+              className="w-full justify-start"
+              onClick={openCommandPalette}
             >
+              Search… ⌘K
+            </Button>
+            <Button
+              variant="ghost"
+              size="sm"
+              className="w-full justify-start"
+              onClick={() => setTheme(theme === 'dark' ? 'light' : 'dark')}
+            >
+              {theme === 'dark' ? 'Light mode' : 'Dark mode'}
+            </Button>
+            <div className="truncate px-1 text-sm text-muted-foreground">{user.email}</div>
+            <Button variant="ghost" size="sm" className="w-full justify-start" onClick={logout}>
               Sign out
-            </button>
+            </Button>
           </div>
         </div>
-      </header>
+      </AppShellSidebar>
 
-      {/* Page content */}
-      <main className="mx-auto max-w-7xl px-4 py-6">
+      <AppShellMain>
         <SystemBanners />
         {children}
-      </main>
-    </div>
+      </AppShellMain>
+    </AppShell>
   );
 }

dashboards/tracker-web/src/components/ui/Primitives.tsx

@@ -146,3 +146,25 @@ export {
 } from '@bytelyst/ui';
 
 export { Timeline, type TimelineItem, type TimelineProps } from '@bytelyst/ui';
+
+// ── UX-8: AppShell nav shell ──────────────────────────────────────────────
+export {
+  AppShell,
+  AppShellMain,
+  AppShellMobileToggle,
+  AppShellNav,
+  AppShellNavItem,
+  AppShellOverlay,
+  AppShellPageHeader,
+  AppShellSidebar,
+  AppShellSkipLink,
+  type AppShellMainProps,
+  type AppShellMobileToggleProps,
+  type AppShellNavItemProps,
+  type AppShellNavProps,
+  type AppShellOverlayProps,
+  type AppShellPageHeaderProps,
+  type AppShellProps,
+  type AppShellSidebarProps,
+  type AppShellSkipLinkProps,
+} from '@bytelyst/ui';