jerry/buzz

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Wes d3ec831e0c fix(desktop): preserve fresh channel timelines (#5577 )

## Summary

- skip the channel subscription catch-up request when the authoritative
channel window was fetched successfully within the existing five-minute
freshness period
- keep the responsive deferred skeleton for populated channel switches
instead of briefly rendering empty-channel actions
- preserve a real empty-channel intro across the first appended message
only after React has committed that empty state

This is intentionally narrow. It does not claim to solve the separate
sidebar startup cost or general main-thread stalls found during the
investigation.

### Related issue

N/A — no matching open issue or PR found.

### Testing

- pre-push desktop gate on `f1be6beea90b9715e04e5fc65cc5cfbe8210e0d9`:
  - desktop tests: 4,621 passed
  - desktop check: passed
  - desktop typecheck: passed
  - branch-skew: passed
- focused cache/surface/lifecycle tests: 62 passed
- manual diagnostic trace after rollback:
  - 16/16 channel revisits skipped catch-up refresh
  - 0 revisit refresh starts
  - 0 populated-channel empty/intro flashes
  - cached switches retained the deferred skeleton-to-list path

No screenshot: the regression is a transient channel-switch state and
request behavior, covered by lifecycle tests and the diagnostic trace
rather than a stable visual diff.

Signed-off-by: Wes <wesbillman@users.noreply.github.com>
Co-authored-by: Carl <c7ebe626f000404285d3686e1dc74cc07cc60a9754a150041ba132e14bd3e2ec@buzz.block.builderlab.xyz>

2026-08-11 09:37:12 -07:00