stable 1.2.5: token field + channel buttons in version card
Ports the channel UI to stable so users who installed the open stable version can paste their subscriber token (save_token) and switch to beta/dev straight from Настройки → Версия и обновления. Adds gh_token_present/save_gh_token helpers and stable/beta/dev quick buttons. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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