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Inside Telegram, a failed initData authentication (e.g. the backend down during a deploy) dropped the user onto the web login screen — the /app/ experience, which has no place inside the Mini App. bootstrap now retries the launch a few times in silence and then renders a dedicated boot-error screen with a Retry button (new BootError.svelte, app.bootError), never falling back to the web sign-in. A blocked account is still terminal and goes straight to the blocked screen. The profile "Link an account" section (email + Telegram link) is hidden while sign-in is provider-only; the anonymous /app/ guest whose upgrade path this is comes later. The flow is kept wired (`hidden` on .emailbox) and its two e2e specs are skipped, both to be re-enabled together. Adds i18n boot.* copy (en/ru), a mock authTelegram failure hook plus an e2e covering the retry screen, and bakes both behaviours into FUNCTIONAL(.md/_ru).