feat(ui): admin-only root link and shared header navigation

src/components/layout/app-header.tsx

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+import type { ReactNode } from "react";
+
+import { Card, CardContent } from "@/src/components/ui/card";
+
+type AppHeaderProps = {
+  title: string;
+  description?: string;
+  actions?: ReactNode;
+};
+
+export function AppHeader({ title, description, actions }: AppHeaderProps) {
+  return (
+    <Card>
+      <CardContent className="flex flex-wrap items-start justify-between gap-4 p-6 lg:p-8">
+        <div>
+          <h1 className="text-3xl font-semibold tracking-tight text-foreground sm:text-4xl">{title}</h1>
+          {description ? <p className="mt-2 max-w-3xl text-sm text-muted-foreground sm:text-base">{description}</p> : null}
+        </div>
+        {actions ? <div className="flex items-center gap-2">{actions}</div> : null}
+      </CardContent>
+    </Card>
+  );
+}

src/components/layout/app-shell.tsx

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+import type { ReactNode } from "react";
+
+import { cn } from "@/lib/utils";
+
+type AppShellProps = {
+  sidebar: ReactNode;
+  header: ReactNode;
+  children: ReactNode;
+  className?: string;
+};
+
+export function AppShell({ sidebar, header, children, className }: AppShellProps) {
+  return (
+    <div className="min-h-screen bg-background">
+      <div className="mx-auto flex w-full max-w-[1400px] gap-6 px-4 py-6 sm:px-6 lg:px-8">
+        <aside className="hidden w-72 shrink-0 md:block">{sidebar}</aside>
+        <div className={cn("flex min-w-0 flex-1 flex-col gap-6", className)}>
+          {header}
+          <main>{children}</main>
+        </div>
+      </div>
+    </div>
+  );
+}

src/components/layout/app-sidebar.tsx

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+import Link from "next/link";
+import type { LucideIcon } from "lucide-react";
+import type { ReactNode } from "react";
+
+import { cn } from "@/lib/utils";
+import { Card, CardContent, CardHeader, CardTitle } from "@/src/components/ui/card";
+
+type SidebarItem = {
+  label: string;
+  href: string;
+  icon: LucideIcon;
+  active?: boolean;
+};
+
+type AppSidebarProps = {
+  title: string;
+  description: string;
+  items: SidebarItem[];
+  footer?: ReactNode;
+};
+
+export function AppSidebar({ title, description, items, footer }: AppSidebarProps) {
+  return (
+    <Card className="sticky top-6 overflow-hidden border-sidebar-border bg-sidebar text-sidebar-foreground shadow-sidebar">
+      <CardHeader className="pb-4">
+        <CardTitle className="text-base font-semibold">{title}</CardTitle>
+        <p className="text-sm text-sidebar-foreground/70">{description}</p>
+      </CardHeader>
+      <CardContent className="space-y-1 px-3 pb-3 pt-0">
+        {items.map((item) => {
+          const Icon = item.icon;
+          return (
+            <Link
+              key={item.label}
+              href={item.href}
+              className={cn(
+                "flex items-center gap-2 rounded-[var(--radius-sidebar)] px-3 py-2 text-sm transition",
+                item.active
+                  ? "bg-sidebar-primary text-sidebar-primary-foreground"
+                  : "text-sidebar-foreground/80 hover:bg-sidebar-accent hover:text-sidebar-accent-foreground",
+              )}
+            >
+              <Icon className="h-4 w-4" />
+              <span>{item.label}</span>
+            </Link>
+          );
+        })}
+      </CardContent>
+      {footer ? <div className="border-t border-sidebar-border px-4 py-3">{footer}</div> : null}
+    </Card>
+  );
+}

src/components/ui/badge.tsx

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+import * as React from "react";
+import { cva, type VariantProps } from "class-variance-authority";
+
+import { cn } from "@/lib/utils";
+
+const badgeVariants = cva(
+  "inline-flex items-center rounded-full border px-2.5 py-0.5 text-xs font-semibold transition-colors focus:outline-none focus:ring-2 focus:ring-ring focus:ring-offset-2",
+  {
+    variants: {
+      variant: {
+        default: "border-transparent bg-primary text-primary-foreground",
+        secondary: "border-transparent bg-secondary text-secondary-foreground",
+        outline: "text-foreground",
+        success: "border-transparent bg-emerald-600/20 text-emerald-700 dark:text-emerald-300",
+        warning: "border-transparent bg-amber-500/20 text-amber-700 dark:text-amber-300",
+      },
+    },
+    defaultVariants: {
+      variant: "default",
+    },
+  },
+);
+
+export interface BadgeProps extends React.HTMLAttributes<HTMLDivElement>, VariantProps<typeof badgeVariants> {}
+
+function Badge({ className, variant, ...props }: BadgeProps) {
+  return <div className={cn(badgeVariants({ variant }), className)} {...props} />;
+}
+
+export { Badge, badgeVariants };

src/components/ui/button.tsx

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+import * as React from "react";
+import { Slot } from "@radix-ui/react-slot";
+import { cva, type VariantProps } from "class-variance-authority";
+
+import { cn } from "@/lib/utils";
+
+const buttonVariants = cva(
+  "inline-flex items-center justify-center whitespace-nowrap rounded-md text-sm font-medium ring-offset-background transition-colors focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring focus-visible:ring-offset-2 disabled:pointer-events-none disabled:opacity-50",
+  {
+    variants: {
+      variant: {
+        default: "bg-primary text-primary-foreground shadow-xs hover:brightness-95",
+        secondary: "bg-secondary text-secondary-foreground shadow-xs hover:bg-secondary/85",
+        outline: "border border-input bg-background shadow-xs hover:bg-muted",
+        ghost: "hover:bg-muted hover:text-foreground",
+        link: "text-primary underline-offset-4 hover:underline",
+        destructive: "bg-destructive text-destructive-foreground shadow-xs hover:brightness-95",
+      },
+      size: {
+        default: "h-10 px-4 py-2",
+        sm: "h-9 rounded-md px-3",
+        lg: "h-11 rounded-md px-8",
+        icon: "h-10 w-10",
+      },
+    },
+    defaultVariants: {
+      variant: "default",
+      size: "default",
+    },
+  },
+);
+
+export interface ButtonProps
+  extends React.ButtonHTMLAttributes<HTMLButtonElement>,
+    VariantProps<typeof buttonVariants> {
+  asChild?: boolean;
+}
+
+const Button = React.forwardRef<HTMLButtonElement, ButtonProps>(
+  ({ className, variant, size, asChild = false, ...props }, ref) => {
+    const Comp = asChild ? Slot : "button";
+
+    return <Comp className={cn(buttonVariants({ variant, size, className }))} ref={ref} {...props} />;
+  },
+);
+Button.displayName = "Button";
+
+export { Button, buttonVariants };

src/components/ui/card.tsx

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+import * as React from "react";
+
+import { cn } from "@/lib/utils";
+
+const Card = React.forwardRef<HTMLDivElement, React.HTMLAttributes<HTMLDivElement>>(
+  ({ className, ...props }, ref) => (
+    <div
+      ref={ref}
+      className={cn(
+        "rounded-[var(--radius-card)] border border-border bg-card text-card-foreground shadow-card",
+        className,
+      )}
+      {...props}
+    />
+  ),
+);
+Card.displayName = "Card";
+
+const CardHeader = React.forwardRef<HTMLDivElement, React.HTMLAttributes<HTMLDivElement>>(
+  ({ className, ...props }, ref) => <div ref={ref} className={cn("flex flex-col space-y-1.5 p-6", className)} {...props} />,
+);
+CardHeader.displayName = "CardHeader";
+
+const CardTitle = React.forwardRef<HTMLParagraphElement, React.HTMLAttributes<HTMLHeadingElement>>(
+  ({ className, ...props }, ref) => <h3 ref={ref} className={cn("text-2xl font-semibold leading-none tracking-tight", className)} {...props} />,
+);
+CardTitle.displayName = "CardTitle";
+
+const CardDescription = React.forwardRef<HTMLParagraphElement, React.HTMLAttributes<HTMLParagraphElement>>(
+  ({ className, ...props }, ref) => <p ref={ref} className={cn("text-sm text-muted-foreground", className)} {...props} />,
+);
+CardDescription.displayName = "CardDescription";
+
+const CardContent = React.forwardRef<HTMLDivElement, React.HTMLAttributes<HTMLDivElement>>(
+  ({ className, ...props }, ref) => <div ref={ref} className={cn("p-6 pt-0", className)} {...props} />,
+);
+CardContent.displayName = "CardContent";
+
+const CardFooter = React.forwardRef<HTMLDivElement, React.HTMLAttributes<HTMLDivElement>>(
+  ({ className, ...props }, ref) => <div ref={ref} className={cn("flex items-center p-6 pt-0", className)} {...props} />,
+);
+CardFooter.displayName = "CardFooter";
+
+export { Card, CardContent, CardDescription, CardFooter, CardHeader, CardTitle };

src/components/ui/input.tsx

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+import * as React from "react";
+
+import { cn } from "@/lib/utils";
+
+const Input = React.forwardRef<HTMLInputElement, React.ComponentProps<"input">>(
+  ({ className, type, ...props }, ref) => {
+    return (
+      <input
+        type={type}
+        className={cn(
+          "flex h-10 w-full rounded-[var(--radius-input)] border border-input bg-background px-3 py-2 text-sm ring-offset-background file:border-0 file:bg-transparent file:text-sm file:font-medium placeholder:text-muted-foreground focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring focus-visible:ring-offset-2 disabled:cursor-not-allowed disabled:opacity-50",
+          className,
+        )}
+        ref={ref}
+        {...props}
+      />
+    );
+  },
+);
+Input.displayName = "Input";
+
+export { Input };

src/components/ui/label.tsx

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+import * as React from "react";
+
+import { cn } from "@/lib/utils";
+
+function Label({ className, ...props }: React.LabelHTMLAttributes<HTMLLabelElement>) {
+  return <label className={cn("text-sm font-medium text-foreground/90", className)} {...props} />;
+}
+
+export { Label };

src/components/ui/separator.tsx

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+import * as React from "react";
+
+import { cn } from "@/lib/utils";
+
+type SeparatorProps = React.HTMLAttributes<HTMLDivElement> & {
+  orientation?: "horizontal" | "vertical";
+};
+
+function Separator({ className, orientation = "horizontal", ...props }: SeparatorProps) {
+  return (
+    <div
+      className={cn(
+        "shrink-0 bg-border",
+        orientation === "horizontal" ? "h-px w-full" : "h-full w-px",
+        className,
+      )}
+      {...props}
+    />
+  );
+}
+
+export { Separator };

src/components/ui/textarea.tsx

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+import * as React from "react";
+
+import { cn } from "@/lib/utils";
+
+const Textarea = React.forwardRef<HTMLTextAreaElement, React.ComponentProps<"textarea">>(
+  ({ className, ...props }, ref) => {
+    return (
+      <textarea
+        className={cn(
+          "flex min-h-[88px] w-full rounded-[var(--radius-input)] border border-input bg-background px-3 py-2 text-sm ring-offset-background placeholder:text-muted-foreground focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring focus-visible:ring-offset-2 disabled:cursor-not-allowed disabled:opacity-50",
+          className,
+        )}
+        ref={ref}
+        {...props}
+      />
+    );
+  },
+);
+Textarea.displayName = "Textarea";
+
+export { Textarea };