feat: info pages — tab replacement, custom pages on /info, responsive fixes

- Add replaces_tab field to admin editor with conflict detection
- Show custom InfoPages as extra tabs on /info page
- Replace built-in tab content when replacement is configured
- Rich DOMPurify sanitizer for TipTap content (images, video, iframe)
- Fix query race: built-in queries wait for tab-replacements to load
- Horizontal scroll for tabs on mobile, 44px touch targets
- Responsive prose: scrollable tables, h-auto on img/video, light theme borders
- Loyalty tier names truncation, progress bar labels stack on mobile

src/locales/en.json

@@ -3825,8 +3825,18 @@
         "isActive": "Active",
         "sortOrder": "Sort Order",
         "icon": "Icon (emoji)",
-        "pageType": "Page Type"
+        "pageType": "Page Type",
+        "replacesTab": "Replaces Tab"
       },
+      "replacesTabNone": "None",
+      "replacesTabOptions": {
+        "faq": "FAQ",
+        "rules": "Rules",
+        "privacy": "Privacy",
+        "offer": "Offer"
+      },
+      "replacesTabConflict": "already assigned",
+      "replacesTabWarning": "Another page already replaces this tab. It will be unassigned on save.",
       "filter": {
         "all": "All",
         "page": "Pages",

src/locales/fa.json

@@ -3393,8 +3393,18 @@
         "isActive": "فعال",
         "sortOrder": "ترتیب",
         "icon": "آیکون (ایموجی)",
-        "pageType": "نوع صفحه"
+        "pageType": "نوع صفحه",
+        "replacesTab": "جایگزینی تب"
       },
+      "replacesTabNone": "بدون جایگزینی",
+      "replacesTabOptions": {
+        "faq": "FAQ",
+        "rules": "قوانین",
+        "privacy": "حریم خصوصی",
+        "offer": "پیشنهاد"
+      },
+      "replacesTabConflict": "قبلا اختصاص داده شده",
+      "replacesTabWarning": "صفحه دیگری قبلا این تب را جایگزین کرده است. با ذخیره، آن صفحه حذف خواهد شد.",
       "filter": {
         "all": "همه",
         "page": "صفحات",

src/locales/ru.json

@@ -4369,8 +4369,18 @@
         "isActive": "Активна",
         "sortOrder": "Порядок сортировки",
         "icon": "Иконка (эмодзи)",
-        "pageType": "Тип страницы"
+        "pageType": "Тип страницы",
+        "replacesTab": "Заменяет таб"
       },
+      "replacesTabNone": "Не заменяет",
+      "replacesTabOptions": {
+        "faq": "FAQ",
+        "rules": "Правила",
+        "privacy": "Конфиденциальность",
+        "offer": "Оферта"
+      },
+      "replacesTabConflict": "уже занят",
+      "replacesTabWarning": "Другая страница уже заменяет этот таб. При сохранении она будет снята.",
       "filter": {
         "all": "Все",
         "page": "Страницы",

src/locales/zh.json

@@ -3392,8 +3392,18 @@
         "isActive": "已激活",
         "sortOrder": "排序",
         "icon": "图标（表情）",
-        "pageType": "页面类型"
+        "pageType": "页面类型",
+        "replacesTab": "替换标签"
       },
+      "replacesTabNone": "不替换",
+      "replacesTabOptions": {
+        "faq": "FAQ",
+        "rules": "规则",
+        "privacy": "隐私",
+        "offer": "条款"
+      },
+      "replacesTabConflict": "已被占用",
+      "replacesTabWarning": "另一个页面已替换此标签。保存后该页面将被取消替换。",
       "filter": {
         "all": "全部",
         "page": "页面",