Expand rgb and led capabilities

[schluis]

Why? What?

Needed for #1931

[Copilot]

Pull Request Overview

Adds two new capabilities for handling RGB colors and LED eye patterns:

• Introduces Rgb::invert to flip color channels.
• Adds Eye::percentage for generating gradient steps based on a fraction.
• Provides Eye::invert to invert all LED eye colors.

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
crates/types/src/led.rs	Added percentage and invert methods on Eye for gradient and inversion behavior.
crates/types/src/color.rs	Implemented invert method on Rgb to invert color channels.

Comments suppressed due to low confidence (3)

crates/types/src/led.rs:67

• Consider clamping or validating fraction to the expected 0.0–1.0 range or using 0.0 directly instead of f32::EPSILON to make the threshold logic clearer and avoid unexpected behavior for very small values.

            color_at_0: if fraction > f32::EPSILON {

crates/types/src/led.rs:110

• Add a doc comment explaining the purpose of invert, what it inverts (e.g., color channels), and any edge cases or expected input ranges.

    pub fn invert(self) -> Self {

crates/types/src/color.rs:153

• Add unit tests covering Rgb::invert (and also Eye::invert/Eye::percentage) to verify correct behavior across edge cases such as black, white, and boundary fraction values.

    pub fn invert(self) -> Self {