Support new color functions for HSL shift

[maxmmitchell]

With 1.1.0-alpha04, we got new color functions:

• Hue offset
• Saturation multiplier
• Luminosity offset

This change adds support for these color functions in brush graph, so we can load brushes that use these new features, and edit them. A lot of formatting changes also got picked up on save in TooltipsTest.kt.

[gemini-code-assist]

Code Review

This pull request expands the color function capabilities in the brush graph UI by adding support for hue offset, saturation multiplier, and luminosity offset. It refactors the display string resolution for ProtoColorFunction into an extension function and updates the corresponding UI fields, tooltips, and tests. Feedback on the changes includes fixing a UI rendering bug where an empty or default ProtoColorFunction results in no numeric field being displayed, displaying the luminosity offset as a percentage instead of a raw float for consistency, and explicitly checking hasLuminosityOffset() in displayStringRId() for better code readability.

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