Fix particle disappearance at antimeridian-crossing viewports; use white

When the viewport crosses ±180° longitude (e.g. Pacific Ocean view),
minOf/maxOf on raw longitudes produces lonWest/lonEast that are backwards.
Every particle then satisfies the out-of-bounds check and is respawned on
every frame → continue → never drawn.

Fix: compute lonSpan from screen-ordered corners (left edge / right edge)
with antimeridian wrap: lonSpan = lonEast >= lonWest ? span : span + 360.
Bounds check uses normalized particle longitude relative to lonWest mod 360.
Particle movement wraps longitude into [-180, 180] to stay consistent.

Also change particle color to white so it contrasts against the blue wind
raster overlay instead of blending into it.

https://claude.ai/code/session_01HXPjBsogsJVRwCiekDGkJX

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