Fix floor-pin horizontal sliding, forward lunge and superman poses, and dips metadata

[a-baran-orhan]

This PR implements fixes for visual quality, form posture, and stability bugs:

1. Systemic Floor-Pin Slide Bug: Precomputed effector world coordinates at segment start times, and locked horizontal coordinates (X/Z) of pinned limbs to their precomputed positions (with continuous segment-start target tracking to prevent boundary snapping/drifting).
2. Forward Lunge: Swapped the ankle angles to plantarflex the left (rear) foot instead of the right (front) foot so that the front foot remains flat on the floor and the rear heel lifts.
3. Superman: Changed shoulder abduction to shoulder flexion so the arms reach forward overhead in a true superman shape.
4. Triceps Dips: Updated the metadata to "Triceps dips (bars)" and equipment "Bars" to align with the rendered parallel bars.

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Project	Deployment	Actions	Updated (UTC)
posecode	Ready	Preview, Comment	Jul 13, 2026 2:09pm