Replace the two _ = discards in executeRun (SaveJobs + CleanupLogs after
an async run) and the _ = in RunDue (SaveJobs before a scheduled run)
with captured errors emitted as ErrorOccurred events after the state
lock is released. The UI subscriber in mainwindow.go handles the new
event by appending an "Error" record to History so failed saves are
visible to the user instead of silently dropped.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
mixeme
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