feat: add per-button enable/disable toggle and custom labels per locale

- Add Toggle per section card to show/hide button in main menu
- Add collapsible locale label inputs (ru, en, ua, zh, fa) per section
- Normalize server response for backward compatibility with older API
- Update all 4 locale files with new translation keys

src/locales/en.json

@@ -1292,6 +1292,10 @@
       "emojiId": "Custom Emoji ID",
       "emojiPlaceholder": "Custom emoji ID (optional)",
       "resetAll": "Reset all styles",
+      "hidden": "Hidden",
+      "customLabels": "Button labels",
+      "labelPlaceholder": "Custom button text",
+      "labelsHint": "Empty = default label",
       "sections": {
         "home": "Home",
         "subscription": "Subscription",

src/locales/fa.json

@@ -1001,6 +1001,10 @@
       "emojiId": "شناسه ایموجی سفارشی",
       "emojiPlaceholder": "شناسه ایموجی سفارشی (اختیاری)",
       "resetAll": "بازنشانی همه سبک‌ها",
+      "hidden": "پنهان",
+      "customLabels": "نام‌های دکمه",
+      "labelPlaceholder": "متن سفارشی دکمه",
+      "labelsHint": "خالی = نام پیش‌فرض",
       "sections": {
         "home": "صفحه اصلی",
         "subscription": "اشتراک",

src/locales/ru.json

@@ -1807,6 +1807,10 @@
       "emojiId": "Custom Emoji ID",
       "emojiPlaceholder": "ID кастомного эмодзи (необязательно)",
       "resetAll": "Сбросить все стили",
+      "hidden": "Скрыта",
+      "customLabels": "Названия кнопки",
+      "labelPlaceholder": "Свой текст кнопки",
+      "labelsHint": "Пустое поле = название по умолчанию",
       "sections": {
         "home": "Главная",
         "subscription": "Подписка",

src/locales/zh.json

@@ -1039,6 +1039,10 @@
       "emojiId": "自定义表情 ID",
       "emojiPlaceholder": "自定义表情 ID（可选）",
       "resetAll": "重置所有样式",
+      "hidden": "已隐藏",
+      "customLabels": "按钮名称",
+      "labelPlaceholder": "自定义按钮文本",
+      "labelsHint": "留空 = 默认名称",
       "sections": {
         "home": "主页",
         "subscription": "订阅",