fix: remove spurious jump on vines in WalkTemplate and add pitch tracking

- WalkTemplate: remove OnClimbable jump/sprint logic that caused the
  player to jump when walking past vine blocks during flat traversal
- TemplateHelper: add CalculatePitch() for computing the look angle
  toward a 3D target relative to eye height
- All templates (Walk, Ascend, Descend, Climb, SprintJump): set
  physics.Pitch each tick so the player visually looks toward the
  current path target direction
- McClient: sync playerPitch and set _yaw/_pitch after pathfinding
  ticks so rotation is included in position update packets sent to
  the server

Made-with: Cursor

MinecraftClient/McClient.cs

@@ -3285,6 +3285,9 @@ namespace MinecraftClient
             {
                 pathSegmentManager.Tick(location, playerPhysics, physicsInput, world);
                 playerYaw = playerPhysics.Yaw;
+                playerPitch = playerPhysics.Pitch;
+                _yaw = playerYaw;
+                _pitch = playerPitch;
                 return;
             }