feat: redesign referral network with scope selector

- Replace full graph with scoped view (campaign/partner/user)
- ScopeSelector component with tabs and searchable dropdown
- Store resets all state on scope change (selection, hover, filters)
- Remove dead NetworkSearch component and graphInstance globals
- i18n keys for scope selector in all 4 locales

src/locales/en.json

@@ -1292,6 +1292,22 @@
         "resetZoom": "Reset zoom",
         "fullscreen": "Fullscreen"
       },
+      "scope": {
+        "title": "Scope",
+        "campaign": "Campaign",
+        "partner": "Partner",
+        "user": "User",
+        "searchPlaceholder": "Search...",
+        "selectCampaign": "Select campaign",
+        "selectPartner": "Select partner",
+        "selectUser": "Search user",
+        "emptyState": "Select a campaign, partner, or user to view their network",
+        "users": "users",
+        "campaigns": "campaigns",
+        "active": "Active",
+        "inactive": "Inactive",
+        "noResults": "Nothing found"
+      },
       "loading": "Loading graph...",
       "error": "Failed to load network data",
       "empty": "No data to display"

src/locales/fa.json

@@ -1126,6 +1126,22 @@
         "resetZoom": "بازنشانی زوم",
         "fullscreen": "تمام‌صفحه"
       },
+      "scope": {
+        "title": "محدوده",
+        "campaign": "کمپین",
+        "partner": "شریک",
+        "user": "کاربر",
+        "searchPlaceholder": "جستجو...",
+        "selectCampaign": "انتخاب کمپین",
+        "selectPartner": "انتخاب شریک",
+        "selectUser": "جستجوی کاربر",
+        "emptyState": "یک کمپین، شریک یا کاربر را برای مشاهده شبکه انتخاب کنید",
+        "users": "کاربران",
+        "campaigns": "کمپین‌ها",
+        "active": "فعال",
+        "inactive": "غیرفعال",
+        "noResults": "نتیجه‌ای یافت نشد"
+      },
       "loading": "بارگذاری گراف...",
       "error": "خطا در بارگذاری داده‌های شبکه",
       "empty": "داده‌ای برای نمایش وجود ندارد"

src/locales/ru.json

@@ -1313,6 +1313,22 @@
         "resetZoom": "Сбросить зум",
         "fullscreen": "Полный экран"
       },
+      "scope": {
+        "title": "Область",
+        "campaign": "Кампания",
+        "partner": "Партнёр",
+        "user": "Пользователь",
+        "searchPlaceholder": "Поиск...",
+        "selectCampaign": "Выберите кампанию",
+        "selectPartner": "Выберите партнёра",
+        "selectUser": "Найти пользователя",
+        "emptyState": "Выберите кампанию, партнёра или пользователя для просмотра сети",
+        "users": "пользователей",
+        "campaigns": "кампаний",
+        "active": "Активна",
+        "inactive": "Неактивна",
+        "noResults": "Ничего не найдено"
+      },
       "loading": "Загрузка графа...",
       "error": "Ошибка загрузки данных сети",
       "empty": "Нет данных для отображения"

src/locales/zh.json

@@ -1126,6 +1126,22 @@
         "resetZoom": "重置缩放",
         "fullscreen": "全屏"
       },
+      "scope": {
+        "title": "范围",
+        "campaign": "活动",
+        "partner": "合作伙伴",
+        "user": "用户",
+        "searchPlaceholder": "搜索...",
+        "selectCampaign": "选择活动",
+        "selectPartner": "选择合作伙伴",
+        "selectUser": "搜索用户",
+        "emptyState": "选择活动、合作伙伴或用户以查看其网络",
+        "users": "用户",
+        "campaigns": "活动",
+        "active": "活跃",
+        "inactive": "非活跃",
+        "noResults": "未找到"
+      },
       "loading": "加载图表...",
       "error": "加载网络数据失败",
       "empty": "无数据显示"