Preset commands change the preset list outside pending_log, and a failed
presets.json write was only logged: unsaved() stayed None, so nothing
warned and the web backup (#1987) would zip a stale presets.json; on
desktop a full disk lost the preset silently. The failure is now kept
(presets_error), counted by unsaved() (plus one change), retried by
persist_if_dirty with the same back-off as failed appends, and cleared
once the write succeeds.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01AbegtYaPuwqZ81pGfELsFK
Claude
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