armMapVisibility() unconditionally scheduled a setTimeout(initMap, 300) on
every reactivation, not just the first mount. initMap()'s own guard made
this harmless (a no-op once the map exists), but it scheduled a throwaway
timer on every tab-switch back into Mesh. Guard the scheduling itself so
intent ("fallback init for the very first mount") matches behavior.
Co-Authored-By: Claude <noreply@anthropic.com>
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