Throttle conditions API; delay particle view until data loaded

loadConditions now skips the API call if conditions were loaded
< 5 min ago and position hasn't moved > 2 nm — prevents 429 from
overlapping triggers (startup backstop, GPS first-fix, camera idle).
Dev log shows "conditions: skip age=Xs dist=Y.Znm" when throttled.

ParticleWindView starts hidden and is revealed only when the first
windArrow value arrives, so particles don't flash before the map loads.

https://claude.ai/code/session_01HXPjBsogsJVRwCiekDGkJX

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