## Summary
- target the visible thread branch collapse guide in the messaging smoke
test
- avoid clicking the underlying collapse rail when the guide overlaps it
- retain the existing post-click assertions that verify the two-reply
branch collapses
## Context
`main` CI failed because Playwright repeatedly attempted to click the
lower `thread-collapse-rail` while the matching `thread-collapse-guide`
intercepted pointer events. Both controls dispatch collapse for the same
branch; the guide is the actual topmost user target and is already used
by `thread-unread.spec.ts`.
Failing run: https://github.com/block/buzz/actions/runs/30575425126
## Validation
- focused Playwright smoke test: 1 passed
- pre-push hooks: desktop check passed; 3,835 desktop tests passed
- `git diff --check`
## Review
Princess Donut reviewed the test-only approach and locator determinism
with no blockers. Mongo review is pending.
Signed-off-by: Wes <wesbillman@users.noreply.github.com>
Co-authored-by: Carl <c7ebe626f000404285d3686e1dc74cc07cc60a9754a150041ba132e14bd3e2ec@buzz.block.builderlab.xyz>
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