Suppress map label flicker from GPS jitter

GPS settling produces many tiny position updates that each triggered a
1-second animateCamera(), forcing continuous symbol-collision
recalculation and label fade cycles.

Fix: skip animation entirely (moveCamera) when the new position is
< 3 m from the last one; use a shorter easeCamera(400 ms) for real
movement so the animation window is smaller.

https://claude.ai/code/session_01HXPjBsogsJVRwCiekDGkJX

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