Adds one mobile-first reply → acknowledge → next flow for every unread update. Retryable failures are admitted as one ordered durable operation; background delivery checkpoints reply confirmation so acknowledgement retries never repost. Partial failures remain recoverable in Drafts.
Verification: 1015 tests passed; Chromium rendered at 320×568 and 390×844 with 44px+ targets and no sheet overflow.
Closes #503
Adds one mobile-first reply → acknowledge → next flow for every unread update. Retryable failures are admitted as one ordered durable operation; background delivery checkpoints reply confirmation so acknowledgement retries never repost. Partial failures remain recoverable in Drafts.
Verification: 1015 tests passed; Chromium rendered at 320×568 and 390×844 with 44px+ targets and no sheet overflow.
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Closes #503
Adds one mobile-first reply → acknowledge → next flow for every unread update. Retryable failures are admitted as one ordered durable operation; background delivery checkpoints reply confirmation so acknowledgement retries never repost. Partial failures remain recoverable in Drafts.
Verification: 1015 tests passed; Chromium rendered at 320×568 and 390×844 with 44px+ targets and no sheet overflow.