Fix batched 2D vector rotation - #2501

Motivation

VectorField calls vectorized functions with an (N, 2) array of sample coordinates. Passing that array to rotate_vector, as in the curl example from #2336, currently attempts to multiply it by a 3x3 rotation matrix and raises a shape-mismatch ValueError.

The helper already accepts a single 2D vector in its public usage. Supporting the vectorized form lets the same helper work naturally with VectorField and restores the pattern used by existing Manim examples.

Closes #2336.

Proposed changes

• Detect vectors whose final dimension is 2 and rotate them with a 2x2 planar rotation matrix.
• Preserve the existing SciPy axis-angle path for individual and batched 3D vectors.
• Add regression coverage for individual and batched 2D and 3D inputs.

Test

Code:

python -m pytest tests/test_space_ops.py -q
python -m compileall -q manimlib tests/test_space_ops.py

The issue reproduction was also exercised through the real VectorField path:

axes = NumberPlane()
curl_func = lambda p: rotate_vector(p / 3, PI / 2)
field = VectorField(curl_func, axes)
result = curl_func(field.sample_coords)

Result:

• 4 passed
• field.sample_coords.shape == (561, 2)
• result.shape == (561, 2) and all values are finite
• compileall completed successfully