v1.2.1

<!-- Release notes generated using configuration in .github/release.yml at main -->

## What's Changed
### ✨ New Features
* feat(workspaces): sticky account rail with billing/redeem links by @realcodesiman in https://github.com/ChatbotXIO/ChatbotX/pull/930
* feat(i18n): add Traditional Chinese translations by @AlanSyue in https://github.com/ChatbotXIO/ChatbotX/pull/928
* feat(channels): add two-tier channel visibility policy for resellers by @realcodesiman in https://github.com/ChatbotXIO/ChatbotX/pull/933
* feat(contacts): import column auto-mapping and template download by @viethung0o0 in https://github.com/ChatbotXIO/ChatbotX/pull/934
* feat: add daily token refresh for tiktok, instagram, and messenger channels by @sung17 in https://github.com/ChatbotXIO/ChatbotX/pull/935
* feat(webchat): add branding, avatars, and widget CSS hardening by @realcodesiman in https://github.com/ChatbotXIO/ChatbotX/pull/938
* feat(channels): add whatsapp token refresh and unify channel refresh jobs by @sung17 in https://github.com/ChatbotXIO/ChatbotX/pull/937
### 🐛 Bug Fixes
* fix(auth): link facebook sso to existing account on matching email by @sung17 in https://github.com/ChatbotXIO/ChatbotX/pull/926
* fix(whatsapp): keep setup working when credit line sharing fails by @viethung0o0 in https://github.com/ChatbotXIO/ChatbotX/pull/927
* fix(worker): prevent scheduled workspace purge from failing on overlapping runs by @viethung0o0 in https://github.com/ChatbotXIO/ChatbotX/pull/931
* fix(ai-function): fix ai function create button not vent by @nguyenvantruc92 in https://github.com/ChatbotXIO/ChatbotX/pull/936
* fix(workspaces): drop unusable serverside redirect after scheduling deletion by @realcodesiman in https://github.com/ChatbotXIO/ChatbotX/pull/941
### ⚡ Improvements
* refactor(worker): delete each workspace as soon as its teardown finishes by @viethung0o0 in https://github.com/ChatbotXIO/ChatbotX/pull/932
* refactor(ui): add allowClear to ComboboxField and dedupe none label by @sung17 in https://github.com/ChatbotXIO/ChatbotX/pull/940


**Full Changelog**: https://github.com/ChatbotXIO/ChatbotX/compare/v1.2.0...v1.2.1