feat(layout): login, uygulama kabuğu, alt menü, hızlı ekle ve dashboard

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/components/providers.tsx

@@ -0,0 +1,17 @@
+"use client";
+
+import { ThemeProvider } from "next-themes";
+import { Toaster } from "@/components/ui/sonner";
+import { TooltipProvider } from "@/components/ui/tooltip";
+
+/** Kök istemci sağlayıcıları: tema (açık/koyu/sistem), tooltip ve bildirimler. */
+export function Providers({ children }: { children: React.ReactNode }) {
+  return (
+    <ThemeProvider attribute="class" defaultTheme="system" enableSystem disableTransitionOnChange>
+      <TooltipProvider delayDuration={300}>
+        {children}
+        <Toaster position="top-center" richColors closeButton />
+      </TooltipProvider>
+    </ThemeProvider>
+  );
+}