fix: add viewport meta tag — iOS was using 980px default width causing desktop sidebar on mobile

src/app/layout.tsx

@@ -1,4 +1,4 @@
-import type { Metadata } from "next";
+import type { Metadata, Viewport } from "next";
 import "./globals.css";
 
 import { ThemeProvider } from "@/components/theme-provider";
@@ -6,6 +6,11 @@ import { Toaster } from "@/components/ui/sonner";
 import { SidebarConfigProvider } from "@/contexts/sidebar-context";
 import { inter } from "@/lib/fonts";
 
+export const viewport: Viewport = {
+  width: "device-width",
+  initialScale: 1,
+};
+
 export const metadata: Metadata = {
   title: "Emlak CRM — Kovak Yazılım ve Medya",
   description: "Emlak ofisleri için çok kiracılı CRM — portföy, müşteri, finans ve eşleştirme.",