feat: implement Tabletop QR Stand Generator with high-res PNG and print-ready A5 PDF export

apps/mobile/src/app/menu/qr.tsx

@@ -2,7 +2,9 @@ import { useEffect, useState } from "react";
 import { router } from "expo-router";
 import {
   ActivityIndicator,
+  Alert,
   Image,
+  Linking,
   Pressable,
   ScrollView,
   Share,
@@ -87,6 +89,14 @@ export default function QrScreen() {
     );
   }
 
+  function handleOpenStandGenerator() {
+    if (!active?.slug) return;
+    const standUrl = `https://menul.io/qr/${active.slug}`;
+    Linking.openURL(standUrl).catch(() => {
+      Alert.alert("Bilgi", `Stant Jeneratörü adresi: ${standUrl}`);
+    });
+  }
+
   return (
     <ScrollView contentContainerStyle={{ flexGrow: 1, backgroundColor: "#FAF8F5", padding: 24, justifyContent: "center" }}>
       <View style={{ maxWidth: 440, width: "100%", alignSelf: "center", alignItems: "center" }}>
@@ -158,6 +168,31 @@ export default function QrScreen() {
 
         {/* Action Buttons */}
         <View style={{ width: "100%", gap: 12 }}>
+          {/* Stand Generator PDF / PNG Button */}
+          <Pressable
+            onPress={handleOpenStandGenerator}
+            style={({ pressed }) => ({
+              backgroundColor: "#C8A96B",
+              borderRadius: 14,
+              padding: 16,
+              flexDirection: "row",
+              alignItems: "center",
+              justifyContent: "center",
+              gap: 10,
+              opacity: pressed ? 0.9 : 1,
+              shadowColor: "#C8A96B",
+              shadowOffset: { width: 0, height: 4 },
+              shadowOpacity: 0.2,
+              shadowRadius: 10,
+              elevation: 4,
+            })}
+          >
+            <Ionicons name="color-palette-outline" size={18} color="#FFFFFF" />
+            <Text style={{ color: "#FFFFFF", fontSize: 15, fontWeight: "800" }}>
+              Masa Stant Tasarımları & İndir (PDF / PNG)
+            </Text>
+          </Pressable>
+
           {/* Share Button */}
           <Pressable
             onPress={handleShare}