Grenade trajectory: actual grenade state, full-length path, rounder rings

- Prefer the local player's thrown frag over the pre-throw estimate: resolve
  CBaseGrenade::m_hThrower from the server datamap (client owner handles as
  fallback), then seed the prediction from the live origin/velocity. The real
  frag is a spinning VPhysics box with a random Y angular impulse, so bounce
  points remain approximate; the doc now says so.
- Keep 512 path points sampled every other 20 ms step (up to 24 s) instead of
  127 points / ~2.5 s, so the line reaches the landing instead of stopping in
  mid-air.
- Radius rings use 36 segments; a segment whose near-plane-clipped endpoint
  the engine overlay refuses falls back to the local projection, and that
  projection now uses the configured camera FOV instead of a hardcoded 75
  degrees (the wide-FOV ring no longer kinks/drops pieces).

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