On a bundled install the boot-failure overlay swapped Repair for Reinstall
for every local failure, so a port clash or a timeout told the user to
reinstall. Classify the electron 'runtime files are missing or damaged'
error as installMissing and offer Reinstall only then; other bundled
failures get Retry/settings/logs with no installer action, since Repair
is refused there anyway. When main refuses repair (stale bundled=false
snapshot) show the reinstall hint instead of the raw 'bundled-immutable'.
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