refactor: Update type hints and streamline distance calculations in playground.py

- Changed the return type of `perpendicular_distance_point_to_line_two_points` to `jnp.floating[Any]` for improved type accuracy.
- Refactored the `perpendicular_distance_camera_2d_points_to_tracking_raycasting` function to store distances in a typed variable, enhancing clarity and type safety.
- Improved the overall readability of the distance calculation logic by returning the computed distances directly.

playground.py

@@ -620,7 +620,7 @@ def calculate_affinity_2d(
 @jaxtyped(typechecker=beartype)
 def perpendicular_distance_point_to_line_two_points(
     point: Num[Array, "3"], line: tuple[Num[Array, "3"], Num[Array, "3"]]
-) -> Float[Array, ""]:
+) -> jnp.floating[Any]:
     """
     Calculate the perpendicular distance between a point and a line.
 
@@ -674,9 +674,11 @@ def perpendicular_distance_camera_2d_points_to_tracking_raycasting(
 
     # Vectorize over all keypoints
     vmap_calc_distance = jax.vmap(calc_distance)
+    distances: Float[Array, "J"] = cast(
+        Any, vmap_calc_distance(predicted_pose, back_projected_points)
+    )
 
-    # Calculate and return distances for all keypoints
-    return vmap_calc_distance(predicted_pose, back_projected_points)
+    return distances
 
 
 @jaxtyped(typechecker=beartype)