Fall back to document.thumb for videos sent as a Telegram document

[techeng322]

Summary

• extractTelegramFileIds only read raw.video?.thumb?.file_id; a video sent as a Telegram "document" (to skip compression) carries its file under message.document instead, and the client-generated thumbnail lands in document.thumb — never checked
• Result: thumbFileId was always undefined for document-uploaded videos, so uploadVideoAttachment.ts never fetched a thumb and the minted token metadata had no image field (no preview)
• Fix: fall back to raw.document?.thumb?.file_id when raw.video?.thumb?.file_id is absent; video.thumb still takes priority when both are present

Stacked on #406 (base branch is that PR's branch, not main) since this branch was cut from its tip — diff here is just the 2 files for this fix.

Test plan

• pnpm vitest run src/lib/telegram/chat/attachment/__tests__/extractTelegramFileIds.test.ts — 10 tests passing, including new cases for document.thumb fallback and video.thumb precedence
• pnpm vitest run src/lib/telegram/chat — 251 tests passing
• Manual: send a video to the Telegram bot as a document (file attach, not compressed video) and confirm the minted token has a preview image

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Project	Deployment	Actions	Updated (UTC)
in-process-api	Ready	Preview	Jul 12, 2026 2:57am

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