v2: progress.WithScaledGradient results in random color, not from gradient

[lrstanley]

Describe the bug
When utilizing progress.WithScaledGradient() with bubbles v2 (v2.0.0-beta.1), the generated gradient results in the below reproduction as a random green color, as a sub-portion of the gradient.

Setup

• OS: Ubuntu (WSL2)
• Shell: Bash
• Terminal Emulator: Windows Terminal (also replicates inside of VHS)
• Terminal Multiplexer: n/a
• Locale: en_US.UTF-8

To Reproduce

1. Run the following example here: https://github.com/lrstanley/bubbletint/blob/v2-exp/examples/package-manager/main.go#L39

• theme.BrightPurple.Hex() == "#fc874f"
• theme.BrightBlue.Hex() == "#ffbe55"

Source Code
https://github.com/lrstanley/bubbletint/tree/v2-exp/examples/package-manager

Expected behavior
Would expect a clean gradient transition between two colors.

Screenshots

Additional context
n/a

[meowgorithm]

This is most likely because we're blending with HSLuv, which is prone to falling out of gamut. I'd say the fix here is to use HSL, which I believe you implemented in the blend PR.

Given that, let's fix this on the v2-exp branch with your new blend utilities.