The chronological-only view was a noodle once Director + N peers
exchange more than a few rounds. New layout: a sub-tab bar at the
top of the panel, with "All" pinned leftmost and one tab per peer
(name + count). Selecting a peer filters the thread to that one
DD↔X conversation; "All" preserves the previous chronological view
as the default.
Tab ordering follows Slack/Linear DM-list convention: most-recent
activity descending, so active conversations rise to the top
without the user scrolling. Counts in parens match Slack's unread
hint pattern (no separate read/unread state — the count is total
in this conversation, computed from the same in-memory message
list the panel already maintains).
Pure-helper extraction: peer-summary derivation lives in
`buildPeerSummary(messages)` so the sort + count logic is unit-
testable without rendering the panel. 5 new tests cover: count
aggregation, most-recent-first ordering, lastTs as max-not-last,
empty input, name-stability when the same peerId carries different
names across messages.
Keyboard: ArrowLeft/Right cycle peer tabs (matches the existing
My Chat / Agent Comms tab pattern in ChatTab). Auto-prune: if the
selected peer has zero messages after a setMessages update (rare,
e.g. dedupe drops the last bubble), fall back to "All" so the
viewer doesn't see an empty thread.
Frontend-only — no platform / runtime / DB changes. The existing
`peerId` / `peerName` fields on CommMessage already carry every
piece of data the new UI needs.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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