Optimize and fix sphere-OBB intersection logic

[CrazyRoka]

Objective

• Optimize the Sphere and OOB intersection logic.
• Fix a bug when the sphere and OBB shared the exact same center.

Solution

• The previous implementation calculated v / d (a normalized vector). If the distance d was zero (in a situation when centers are identical), this resulted in a division by zero. The new approach avoids normalization by refactoring the comparison.
• Original: $d < r_1 + r_2$ where $r_2 =$ relative_radius$\Bigl(\frac{\mathbf{v}}{d}\Bigr)$
• New: $d^2 \leq r \cdot d + r_{\rm unscaled}$ where $r_{\rm unscaled} =$ relative_radius$(\mathbf{v})$

Testing

• Added new test cases covering identical centers, edge contacts, and zero-extent volumes. These tests fail on main but pass with this PR.
• Verified performance via the newly added camera benchmarks in Add camera primitives benchmark #23863

intersects_obb/sphere_intersects_obb
                        time:   [5.3677 ns 5.3932 ns 5.4227 ns]
                        change: [−19.462% −18.945% −18.426%] (p = 0.00 < 0.05)
                        Performance has improved.