PR 1: Optimistic outbox, chat autoscroll and deny lifecycle

[EpicStarAi]

Scope

Implements the first behavior/safety quality pass for EPIC☠️GRAM:

• Closes P0: Verify operator safety guard in production #9 — production verification of the read-only safety guard
• Closes P0: Add optimistic outgoing bubble with TDLib deduplication #10 — optimistic outgoing bubble with TDLib deduplication
• Closes P1: Implement Telegram chat autoscroll and detached reader mode #11 — Telegram chat autoscroll and detached reader mode
• Closes P1: Complete operator action lifecycle for Deny → CANCELLED #12 — terminal Deny → CANCELLED lifecycle

Current state

The branch now contains the implementation contract and QA gates. Code commits will follow in this draft PR.

Invariants

• Read-only requests never create write actions.
• Prepare-send creates pending state only.
• Only explicit Allow may reach Telegram send.
• Deny is terminal and cannot be revived after refresh/localStorage restore.
• Manual send shows a right-side bubble immediately.
• TDLib refresh must not duplicate the optimistic bubble.
• Opening/switching chats starts at the newest message.
• Reading older history is not interrupted by polling.

QA gates before ready-for-review

• Next.js build passes.
• Read-only production scenario shows no action card and no mutation.
• Prepare-send shows exact chat/text with Allow/Deny and no pre-Allow send.
• Deny produces CANCELLED and no network write.
• Allow produces exactly one Telegram message.
• Optimistic bubble appears immediately and deduplicates after TDLib refresh.
• Detached reader mode shows ↓ Новые сообщения instead of forcing scroll.