A heavy agent turn buried user/Claude prose under a wall of tool-call/
result rows. A pure grouping pass (activity_cluster.dart) folds runs of
consecutive meta items into clusters; the conversation view renders each
cluster as one collapsible activity card — collapsed by default with a
live one-line ticker of the latest step + a step count, click/Enter to
expand the steps in order. Sticky items (user messages, Claude prose,
and FAILED results) render first-class and seal the cluster.
Fold level is switchable (FoldLevel none/tools/thinking/everything);
default L1 folds tool calls+results while keeping diffs and thinking
first-class. The grouping logic is fully unit-tested; the card is
keyboard + screen-reader accessible. Persisting the level via a user
setting + control is the tracked follow-up T-235.
Closes T-230 (under T-132).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
jpmschweitzerandClaude Opus 4.8
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