feat(shell): add shared app shell primitives

Add AppShell, AppNav components and refactor ThemeChanger for header use

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

src/components/core/AppNav.tsx

@@ -0,0 +1,44 @@
+"use client";
+
+import Link from "next/link";
+import { useTranslations } from "next-intl";
+import { routes } from "@/lib/routes";
+import { ThemeChanger } from "./ThemeChanger";
+import { AuthNavActions } from "./AuthNavActions";
+import { cn } from "@/lib/utils";
+
+interface AppNavProps {
+  className?: string;
+}
+
+export function AppNav({ className }: AppNavProps) {
+  const t = useTranslations("Navigation");
+
+  return (
+    <header
+      data-testid="app-nav"
+      className={cn(
+        "border-b bg-background sticky top-0 z-50",
+        className
+      )}
+    >
+      <div className="max-w-7xl mx-auto px-4 sm:px-6 lg:px-8">
+        <div className="flex h-16 items-center justify-between">
+          <div className="flex items-center">
+            <Link
+              href={routes.public.home}
+              className="text-xl font-bold text-foreground hover:text-foreground/80 transition-colors"
+            >
+              {t("Home")}
+            </Link>
+          </div>
+
+          <div className="flex items-center gap-4">
+            <AuthNavActions />
+            <ThemeChanger />
+          </div>
+        </div>
+      </div>
+    </header>
+  );
+}

src/components/core/AppShell.tsx

@@ -0,0 +1,14 @@
+import { cn } from "@/lib/utils";
+
+interface AppShellProps {
+  children: React.ReactNode;
+  className?: string;
+}
+
+export function AppShell({ children, className }: AppShellProps) {
+  return (
+    <div data-testid="app-shell" className={cn("min-h-screen flex flex-col", className)}>
+      {children}
+    </div>
+  );
+}

src/components/core/ThemeChanger.tsx

@@ -1,8 +1,17 @@
 "use client";
+
 import { useTheme } from "@wrksz/themes/client";
 import { useSyncExternalStore } from "react";
+import { Button } from "@/components/ui/button";
+import { HugeiconsIcon } from "@hugeicons/react";
+import { Sun01Icon, Moon02Icon } from "@hugeicons/core-free-icons";
+import { cn } from "@/lib/utils";
 
-export const ThemeChanger = () => {
+interface ThemeChangerProps {
+  className?: string;
+}
+
+export function ThemeChanger({ className }: ThemeChangerProps) {
   const { theme, setTheme } = useTheme();
   const mounted = useSyncExternalStore(
     () => () => undefined,
@@ -11,18 +20,33 @@ export const ThemeChanger = () => {
   );
 
   if (!mounted) {
-    return <p>Loading theme...</p>;
+    return (
+      <div data-testid="theme-switcher" className={cn("flex items-center gap-1", className)}>
+        <Button variant="ghost" size="icon" disabled>
+          <HugeiconsIcon icon={Sun01Icon} className="h-4 w-4" />
+        </Button>
+      </div>
+    );
   }
 
   return (
-    <div>
-      <p>The current theme is: {theme}</p>
-      <button type="button" onClick={() => setTheme("light")}>
-        Light Mode
-      </button>
-      <button type="button" onClick={() => setTheme("dark")}>
-        Dark Mode
-      </button>
+    <div data-testid="theme-switcher" className={cn("flex items-center gap-1", className)}>
+      <Button
+        variant={theme === "light" ? "default" : "ghost"}
+        size="icon"
+        onClick={() => setTheme("light")}
+        aria-label="Light mode"
+      >
+        <HugeiconsIcon icon={Sun01Icon} className="h-4 w-4" />
+      </Button>
+      <Button
+        variant={theme === "dark" ? "default" : "ghost"}
+        size="icon"
+        onClick={() => setTheme("dark")}
+        aria-label="Dark mode"
+      >
+        <HugeiconsIcon icon={Moon02Icon} className="h-4 w-4" />
+      </Button>
     </div>
   );
-};
+}