saveConfig refreshed config.updatedAt by mutating the config object in
place. That only worked because every reader view shares one config
object reference, and it bypassed Zustand change-detection entirely.
Refresh updatedAt via an immutable setConfig store update instead, so it
no longer depends on callers sharing the same reference, notifies
subscribers, and never mutates the caller-provided object. Sync behavior
is unchanged.
Refs #4184
Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Huang Xin
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