* fix(channels): keep staging cleanup from replacing the save error
The channel stores publish state through a staged temporary file and, if the
rename fails, close and unlink that file inside the handler before re-raising.
Neither step was guarded, so a failing close skipped the unlink and a failing
unlink replaced the error that actually caused the save to fail -- leaving the
staged copy, which for the runtime-config and WeChat stores holds an 0600 IM
token, behind with nothing reporting it.
Make both steps independently best-effort, name the leaked file in a WARNING,
and suppress the diagnostic itself so a broken log handler cannot become the
reported failure. This is the same contract PR #6871 establishes for browser
captures, applied to the three JSON publishers in app/channels.
* fix(channels): address staging cleanup review follow-ups
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Co-authored-by: Willem Jiang <willem.jiang@gmail.com>
d85e0e8608