opens unread updates on the newest bounded conversation page
loads older messages in place with single-flight and stale-response protection
appends confirmed replies exactly once while keeping mark-read separate
Verification
pytest -q — 347 passed
rendered Chromium at 320×568 and 390×844 — chronological prepend, no horizontal overflow, all controls ≥44px
Closes #219
## Outcome
- opens unread updates on the newest bounded conversation page
- loads older messages in place with single-flight and stale-response protection
- appends confirmed replies exactly once while keeping mark-read separate
## Verification
- `pytest -q` — 347 passed
- rendered Chromium at 320×568 and 390×844 — chronological prepend, no horizontal overflow, all controls ≥44px
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Closes #219
Outcome
Verification
pytest -q— 347 passed