Fix: Robust i18n checks in Checkout to prevent crashes

src/scenes/user/checkout.js

@@ -11,7 +11,9 @@ const formatPrice = (price) => {
 
 // Common Keyboard
 const navKeyboard = (ctx, i18n, extras = []) => {
-    const k = [[i18n.btn_back_nav, i18n.btn_cancel]];
+    const back = i18n.btn_back_nav || "⬅️ Back";
+    const cancel = i18n.btn_cancel || "❌ Cancel";
+    const k = [[back, cancel]];
     if (extras.length) k.unshift(...extras);
     return Markup.keyboard(k).resize().oneTime();
 };
@@ -21,13 +23,16 @@ const checkNav = (ctx) => {
     const text = ctx.message.text;
     const i18n = ctx.i18n || require('../../locales').uz;
 
+    const btnCancel = i18n.btn_cancel || "❌ Cancel";
+    const btnBack = i18n.btn_back_nav || "⬅️ Back";
+
     // Robust checking against localised strings
-    if (text === i18n.btn_cancel || text === '❌ Bekor qilish' || text === '❌ Отмена' || text === '❌ Cancel') {
+    if (text === btnCancel || text === '❌ Bekor qilish' || text === '❌ Отмена' || text === '❌ Cancel') {
         ctx.scene.leave();
-        ctx.reply(i18n.cancel_process, Markup.removeKeyboard());
+        ctx.reply(i18n.cancel_process || "Cancelled", Markup.removeKeyboard());
         return 'STOP';
     }
-    if (text === i18n.btn_back_nav || text === '⬅️ Ortga' || text === '⬅️ Назад' || text === '⬅️ Back') {
+    if (text === btnBack || text === '⬅️ Ortga' || text === '⬅️ Назад' || text === '⬅️ Back') {
         return 'BACK';
     }
     return null;
@@ -136,15 +141,19 @@ const checkoutScene = new Scenes.WizardScene(
         const user = await User.findOne({ id: ctx.from.id });
         ctx.wizard.state.user = user;
 
-        let keyboard = [[Markup.button.contactRequest(i18n.phone_button)], [i18n.btn_cancel]];
-        let msg = i18n.phone_prompt;
+        // Defensive i18n
+        const btnPhone = i18n.phone_button || "📱 Send Number";
+        const btnCancel = i18n.btn_cancel || "❌ Cancel";
+        const msgText = i18n.phone_prompt || "Send Phone";
+
+        let keyboard = [[Markup.button.contactRequest(btnPhone)], [btnCancel]];
 
         if (user && user.phone) {
-            keyboard = [[i18n.checkout_phone_saved.replace('{phone}', user.phone)], [Markup.button.contactRequest(i18n.phone_button)], [i18n.btn_cancel]];
-            msg = i18n.phone_prompt;
+            const savedText = i18n.checkout_phone_saved || "📱 Saved: {phone}";
+            keyboard = [[savedText.replace('{phone}', user.phone)], [Markup.button.contactRequest(btnPhone)], [btnCancel]];
         }
 
-        ctx.reply(msg, Markup.keyboard(keyboard).resize().oneTime());
+        ctx.reply(msgText, Markup.keyboard(keyboard).resize().oneTime());
         return ctx.wizard.next();
     },
     // Step 1: Handle Phone -> Delivery