Add rotateable hitbox support for collision detection

[Copilot]

Adds rotated rectangle collision detection using Separating Axis Theorem (SAT), enabling mechanics like swimming, rope swinging, and rotating platforms.

Changes

New RotatedRectf class (src/math/rotated_rectf.hpp/.cpp)

• Rectangle represented by center, half-extents, and rotation angle
• SAT-based overlaps() for rotated-vs-rotated and rotated-vs-AABB collision
• Helper methods: get_corners(), get_axes(), get_aabb(), contains()

CollisionObject rotation support

• Added m_rotation_angle member with accessors
• get_rotated_bbox() returns SAT-compatible representation
• has_rotation() for fast path when angle is zero

CollisionSystem integration

• collision_object() and touchable collision checks use SAT when either object has rotation
• Debug drawing renders rotated hitboxes as outlines with rotation indicator

Scripting API

• MovingObject::get_hitbox_rotation() / set_hitbox_rotation(angle) exposed to Squirrel

Usage

// C++
m_col.set_rotation_angle(M_PI / 4.0f);

// Squirrel
obj.set_hitbox_rotation(0.785398);

Tests

Added RotatedRectfTest covering construction, point containment, corner calculation, AABB computation, and overlap detection.

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Original prompt

Something that would be really benefitial is having rotateable hitboxes (for mechanics like swimming, swinging on ropes, rotating platforms etc.).

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