Implement Texture Rotation

[yuberee]

Separated pull request from #190

Add Rotation to LineRenderer's TrailTextureConfig. When changing texture scale or rope radius the fibers "rotate" from their normal 45° pattern if you didn't scale with the correct ratio in mind, or if you got a seamless rope texture from the internet most of the time it would be rotated the wrong way. This lets you rotate the texture.

Video of the changes in action:
https://files.smallfi.sh/ubre/a2de85f/rope.mp4

[Copilot]

Pull request overview

This pull request adds texture rotation functionality to line renderers and trail renderers, allowing developers to rotate textures around the UV center to correct misaligned seamless textures or adjust fiber patterns.

Changes:

• Added Rotation property to TrailTextureConfig for specifying texture rotation in degrees
• Implemented UV rotation logic in the line shader to apply rotation around the center point
• Connected the rotation property from C# components to the shader via attributes

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
game/addons/base/Assets/shaders/line.shader	Implements UV rotation transformation in the pixel shader using standard 2D rotation matrix
engine/Sandbox.Engine/Systems/SceneSystem/SceneTrailObject.cs	Adds Rotation property to TrailTextureConfig and passes it to shader attributes
engine/Sandbox.Engine/Scene/Components/Render/LineRenderer.cs	Sets TextureRotation attribute from Texturing.Rotation property

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