feat: add web campaign links — capture, auth integration, bonus UI

- Add campaign.ts utility (capture from URL, localStorage with TTL, validation)
- Pass campaign_slug in all auth API methods (telegram, widget, email, oauth)
- Consume slug in auth store login methods, set pendingCampaignBonus state
- Add CampaignBonusNotifier component (toast on bonus, mounted in AppShell)
- Show web_link alongside bot deep_link in AdminCampaignStats
- Add CampaignBonusInfo type with union bonus_type
- Fix VerifyEmail: ref guard against StrictMode double-fire, setTimeout cleanup
- Fix AdminCampaignStats: setTimeout refs with cleanup, i18n-aware locale
- Wrap all localStorage access in try/catch (Safari private browsing safety)
- Add campaignBonus translations (ru/en/fa/zh)

src/locales/en.json

@@ -70,6 +70,12 @@
     "newUserReply": "User replied in ticket: {{title}}",
     "newUserReplyTitle": "User Reply"
   },
+  "campaignBonus": {
+    "title": "Bonus activated!",
+    "balance": "You received {{amount}} RUB from campaign \"{{name}}\"",
+    "subscription": "You received a {{days}}-day subscription from campaign \"{{name}}\"",
+    "tariff": "You received tariff \"{{tariff}}\" from campaign \"{{name}}\""
+  },
   "wsNotifications": {
     "balance": {
       "topupTitle": "Balance topped up",
@@ -1684,6 +1690,8 @@
         "inactive": "Inactive",
         "copy": "Copy",
         "copied": "Copied!",
+        "botLink": "Bot link",
+        "webLink": "Web link",
         "users": "Users",
         "noUsers": "No registered users",
         "paid": "Paid",