Seasonal iter4: real petal shape, bolder…

Details

Round-2 critique follow-ups:
- Petals: replace the oval bezier (read as dots) with a true cherry-
  blossom silhouette — pointed tip, wide belly, notched base — and bump
  petal size/alpha so spring reads as blossoms on both themes.
- Winter wind on light theme: thicken and brighten gust streaks on the
  cream theme so the wind reads at a glance.
- Summer: raise god-ray alpha and add an outer limb-darkening stop so
  the disc edge is soft, not a flat sticker.
- Fall: darken the palest light-theme leaf colors so small leaves stay
  visible on cream.
Still ~60fps in all seasons.

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