Fix typehint of Vector direction parameter (#3640)

* Fix typehint of Vector

* Change from Vector to Point in typehint

In `TipableVMobject._pointify` it converts a 3D
list of the form [x, y, z] to a Vector3D. Therefore
the direction parameter can take lists, not just numpy arrays.

Author: JasonGrace2282

manim/mobject/geometry/line.py

@@ -17,7 +17,6 @@
 from typing import TYPE_CHECKING
 
 import numpy as np
-from typing_extensions import Self
 
 from manim import config
 from manim.constants import *
@@ -31,6 +30,8 @@
 from manim.utils.space_ops import angle_of_vector, line_intersection, normalize
 
 if TYPE_CHECKING:
+    from typing_extensions import Self
+
     from manim.typing import Point2D, Point3D, Vector3D
     from manim.utils.color import ParsableManimColor
 
@@ -659,7 +660,9 @@ def construct(self):
                 self.add(plane, vector_1, vector_2)
     """
 
-    def __init__(self, direction: Vector3D = RIGHT, buff: float = 0, **kwargs) -> None:
+    def __init__(
+        self, direction: Point2D | Point3D = RIGHT, buff: float = 0, **kwargs
+    ) -> None:
         self.buff = buff
         if len(direction) == 2:
             direction = np.hstack([direction, 0])