* fix: hide archived section and empty folders when no sessions remain
- Only push archived group in useSessionGrouping when there are archived
sessions, preventing an empty archived section from rendering
- Hide empty folders in archived bucket via shouldKeepFolder check in
SessionGroupSection (folders with no sessions and no content in
children are filtered out)
- Always filter folders through shouldKeepFolder, not just during search
* perf: memoize archived folder filtering
* fix(sync): deduplicate overlapping delta after coalesced part.updated
When message.part.updated coalesces in the event pipeline and a
message.part.delta for the same part arrives in the same flush window,
the reducer appends the delta verbatim to the already-complete field
value, producing duplicated text in tool output and assistant messages.
Add targeted overlap reconciliation: only when a part.updated replaces
an existing part with overlapping string content, mark the next delta
for that field as dedupe-eligible. Normal streaming deltas remain
untouched (pure append).
Covers four cases:
- Full overlap: delta already present -> no-op
- Partial overlap: only non-overlapping suffix appended
- No overlap: unchanged append behavior
- Legitimate repeated output (ha + ha -> haha): preserved
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Co-authored-by: Bohdan Triapitsyn <artmore@protonmail.com>
