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63d14a0e95 fix(desktop): preserve live channel timelines (#5662 )

## Summary

- restore the post-subscribe channel-window refresh that closes the gap
left by a live subscription starting at the current second
- prevent an unresolved, pageless channel window from replacing a
populated timeline cache with its first live event
- replace the invalid freshness-gate tests with a regression reproducing
the populated cache + pageless window + first live event state from the
report

## Root cause

This was a data-projection bug, not a virtualized-row failure. PR #5577
skipped the post-subscribe refresh for a fresh cache even though
`subscribeToChannelLive` starts at `since: now`, leaving events between
the cached page and subscription establishment undiscovered. A
successful but pageless companion window could then receive one live
event and project that one-row overlay over the populated message cache.
Reload fetched page zero and restored the conversation.

## Validation

Validated exact head `bfbaefe95da5452cdda3a0b5df970eb11e44f6f8`:

- focused `projectChannelWindow.test.mjs`: 9/9 passed
- pre-push: branch skew, desktop check, desktop typecheck, and all 4,715
desktop tests passed
- independent fresh-frame review: 9/10, no blockers

## Authorship disclosure

Carl implemented and is posting this change on Wes's behalf.

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

2026-08-12 16:19:43 +00:00