feat(ui): consume common app shell

web/src/app/globals.css

@@ -25,10 +25,12 @@
   --bl-accent-muted: var(--nl-accent-muted);
   --bl-surface-card: var(--nl-surface-card);
   --bl-surface-muted: var(--nl-surface-muted);
+  --bl-surface-sidebar: var(--nl-surface-sidebar);
   --bl-text-primary: var(--nl-text-primary);
   --bl-text-secondary: var(--nl-text-secondary);
   --bl-text-tertiary: var(--nl-text-tertiary);
   --bl-border: var(--nl-border-default);
+  --bl-overlay-scrim: var(--nl-overlay-scrim);
   --bl-success: var(--nl-status-success);
   --bl-success-muted: var(--nl-success-muted);
   --bl-success-border: var(--nl-status-success);
@@ -92,6 +94,7 @@ button {
 .main-panel {
   min-width: 0;
   padding: var(--nl-space-8);
+  padding-left: calc(var(--bl-app-sidebar-width, 280px) + var(--nl-space-8));
 }
 
 .app-shell > .sidebar {

web/src/components/AppShell.tsx

@@ -3,7 +3,14 @@
 import { type ReactNode, useState, useCallback, useEffect } from "react";
 import { usePathname } from "next/navigation";
 import { Sidebar } from "@/components/Sidebar";
-import { Button, Card } from "@/components/ui/Primitives";
+import {
+  AppShell as AppShellFrame,
+  AppShellMain,
+  AppShellMobileToggle,
+  AppShellOverlay,
+  AppShellPageHeader,
+  AppShellSkipLink,
+} from "@/components/ui/Primitives";
 
 export function AppShell({
   title,
@@ -27,47 +34,15 @@ export function AppShell({
   const close = useCallback(() => setSidebarOpen(false), []);
 
   return (
-    <div className="app-shell">
-      <a href="#main-content" className="skip-link">
-        Skip to main content
-      </a>
-      <Button
-        className="sidebar-toggle"
-        onClick={toggle}
-        aria-label={sidebarOpen ? "Close menu" : "Open menu"}
-        type="button"
-        variant="secondary"
-        size="sm"
-      >
-        {sidebarOpen ? "\u2715" : "\u2630"}
-      </Button>
-      <div
-        className={`sidebar-overlay${sidebarOpen ? " open" : ""}`}
-        onClick={close}
-        aria-hidden="true"
-      />
+    <AppShellFrame sidebarWidth={280}>
+      <AppShellSkipLink />
+      <AppShellMobileToggle open={sidebarOpen} onClick={toggle} />
+      <AppShellOverlay open={sidebarOpen} onClick={close} />
       <Sidebar open={sidebarOpen} />
-      <main id="main-content" className="main-panel" tabIndex={-1} aria-labelledby="page-title">
-        <div className="page-grid">
-          <header>
-            <Card
-              style={{ padding: "var(--nl-space-6)", display: "flex", justifyContent: "space-between", gap: "var(--nl-space-4)", alignItems: "start", flexWrap: "wrap" }}
-            >
-              <div style={{ display: "grid", gap: "var(--nl-space-2)" }}>
-                <h1
-                  id="page-title"
-                  style={{ margin: 0, fontFamily: "var(--nl-font-display)", fontSize: "var(--nl-fs-2xl)", fontWeight: 700 }}
-                >
-                  {title}
-                </h1>
-                <div style={{ color: "var(--nl-text-secondary)", maxWidth: 720 }}>{description}</div>
-              </div>
-              {actions ? <div aria-label="Page actions">{actions}</div> : null}
-            </Card>
-          </header>
-          {children}
-        </div>
-      </main>
-    </div>
+      <AppShellMain labelledBy="page-title" className="main-panel">
+        <AppShellPageHeader title={title} description={description} actions={actions} />
+        {children}
+      </AppShellMain>
+    </AppShellFrame>
   );
 }

web/src/components/Sidebar.tsx

@@ -1,10 +1,16 @@
 "use client";
 
-import Link from "next/link";
 import { usePathname } from "next/navigation";
 import { House, Search, Settings, Sparkles, FolderKanban, ShieldCheck, MessageCircle, Brain } from "lucide-react";
 import { PRODUCT_NAME } from "@/lib/product-config";
 import { isFeatureEnabled } from "@/lib/feature-flags";
+import {
+  AppShellNav,
+  AppShellNavItem,
+  AppShellSidebar,
+  Badge,
+  Panel,
+} from "@/components/ui/Primitives";
 
 const navItems: { href: string; label: string; icon: typeof House; flag?: string }[] = [
   { href: "/dashboard", label: "Dashboard", icon: House },
@@ -21,56 +27,47 @@ export function Sidebar({ open }: { open?: boolean }) {
   const pathname = usePathname() ?? "";
 
   return (
-    <aside className={`sidebar app-sidebar${open ? ' open' : ''}`} style={{ padding: "var(--nl-space-6)" }} aria-label="Primary">
+    <AppShellSidebar open={open ?? false} width={280} className="sidebar p-[var(--nl-space-6)]">
       <div style={{ display: "grid", gap: "var(--nl-space-6)" }}>
-        <div className="surface-card" style={{ padding: "var(--nl-space-5)", display: "grid", gap: "var(--nl-space-3)" }}>
-          <div className="badge" style={{ width: "fit-content" }}>
+        <Panel as="div" style={{ display: "grid", gap: "var(--nl-space-3)" }}>
+          <Badge style={{ width: "fit-content" }}>
             <Sparkles size={14} />
             Web Agent workstream
-          </div>
+          </Badge>
           <div>
             <div style={{ fontSize: "var(--nl-fs-xl)", fontFamily: "var(--nl-font-display)", fontWeight: 700 }}>{PRODUCT_NAME}</div>
             <div style={{ color: "var(--nl-text-secondary)", marginTop: 6 }}>
               Human-first notes UX with agent-safe structure and review surfaces.
             </div>
           </div>
-        </div>
+        </Panel>
 
-        <nav aria-label="Primary navigation" style={{ display: "grid", gap: "var(--nl-space-2)" }}>
+        <AppShellNav>
           {navItems.filter((item) => !item.flag || isFeatureEnabled(item.flag)).map((item) => {
             const Icon = item.icon;
             const active = pathname === item.href || pathname.startsWith(`${item.href}/`);
             return (
-              <Link
+              <AppShellNavItem
                 key={item.href}
                 href={item.href}
-                className="surface-muted nav-link"
-                aria-current={active ? "page" : undefined}
-                style={{
-                  display: "flex",
-                  alignItems: "center",
-                  gap: "var(--nl-space-3)",
-                  padding: "12px 14px",
-                  borderColor: active ? "var(--nl-accent-primary)" : undefined,
-                  background: active ? "var(--nl-accent-muted)" : undefined,
-                }}
+                active={active}
+                icon={<Icon size={18} />}
               >
-                <Icon size={18} />
-                <span>{item.label}</span>
-              </Link>
+                {item.label}
+              </AppShellNavItem>
             );
           })}
-        </nav>
+        </AppShellNav>
 
-        <div className="surface-card" style={{ padding: "var(--nl-space-5)", display: "grid", gap: "var(--nl-space-2)" }}>
+        <Panel as="div" style={{ display: "grid", gap: "var(--nl-space-2)" }}>
           <strong>Keyboard flow</strong>
           <span style={{ color: "var(--nl-text-secondary)" }}>
             <kbd style={{ opacity: 0.85 }}>⌘K</kbd> / <kbd style={{ opacity: 0.85 }}>Ctrl+K</kbd> command palette
           </span>
           <span style={{ color: "var(--nl-text-secondary)" }}>Use Tab to move between navigation, filters, and dense result surfaces.</span>
           <span style={{ color: "var(--nl-text-secondary)" }}>Use the skip link to jump directly into page content.</span>
-        </div>
+        </Panel>
       </div>
-    </aside>
+    </AppShellSidebar>
   );
 }

web/src/components/ui/Primitives.tsx

@@ -1,4 +1,13 @@
 import {
+  AppShell as BytelystAppShell,
+  AppShellMain as BytelystAppShellMain,
+  AppShellMobileToggle as BytelystAppShellMobileToggle,
+  AppShellNav as BytelystAppShellNav,
+  AppShellNavItem as BytelystAppShellNavItem,
+  AppShellOverlay as BytelystAppShellOverlay,
+  AppShellPageHeader as BytelystAppShellPageHeader,
+  AppShellSidebar as BytelystAppShellSidebar,
+  AppShellSkipLink as BytelystAppShellSkipLink,
   Badge as BytelystBadge,
   Button as BytelystButton,
   Card as BytelystCard,
@@ -53,6 +62,15 @@ import {
   TooltipContent,
   TooltipProvider,
   TooltipTrigger,
+  type AppShellMainProps,
+  type AppShellMobileToggleProps,
+  type AppShellNavItemProps,
+  type AppShellNavProps,
+  type AppShellOverlayProps,
+  type AppShellPageHeaderProps,
+  type AppShellProps,
+  type AppShellSidebarProps,
+  type AppShellSkipLinkProps,
   type BadgeProps,
   type ButtonProps,
   type CardProps,
@@ -144,6 +162,42 @@ const statusToneMap: Record<NoteLettStatus, StatusTone> = {
   review: "accent",
 };
 
+export function AppShell({ className, ...props }: AppShellProps) {
+  return <BytelystAppShell className={className} {...props} />;
+}
+
+export function AppShellSkipLink({ className, ...props }: AppShellSkipLinkProps) {
+  return <BytelystAppShellSkipLink className={className} {...props} />;
+}
+
+export function AppShellMobileToggle({ className, ...props }: AppShellMobileToggleProps) {
+  return <BytelystAppShellMobileToggle className={className} {...props} />;
+}
+
+export function AppShellOverlay({ className, ...props }: AppShellOverlayProps) {
+  return <BytelystAppShellOverlay className={className} {...props} />;
+}
+
+export function AppShellSidebar({ className, ...props }: AppShellSidebarProps) {
+  return <BytelystAppShellSidebar className={className} {...props} />;
+}
+
+export function AppShellMain({ className, ...props }: AppShellMainProps) {
+  return <BytelystAppShellMain className={className} {...props} />;
+}
+
+export function AppShellPageHeader({ className, ...props }: AppShellPageHeaderProps) {
+  return <BytelystAppShellPageHeader className={className} {...props} />;
+}
+
+export function AppShellNav({ className, ...props }: AppShellNavProps) {
+  return <BytelystAppShellNav className={className} {...props} />;
+}
+
+export function AppShellNavItem({ className, ...props }: AppShellNavItemProps) {
+  return <BytelystAppShellNavItem className={className} {...props} />;
+}
+
 export function getStatusTone(status: NoteLettStatus): StatusTone {
   return statusToneMap[status];
 }