The optimistic cache made a refused write invisible: the UI stayed correct until the next reload, at
which point the change was simply gone. That is tolerable for a pane size and not for a chat panel's
agent name, which is the address a peer agent is delivered to.
Roll back only if the cache still holds exactly what we wrote — writes to one key overlap freely (a
window resize fires one per group) and rolling back over a later successful write would turn one
failure into two.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
pastilhasandClaude Opus 5
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