Option to ignore alpha when enforcing linked colors

[SametHope]

Improvement Proposal: Right now, linked colors always enforce both RGB and alpha values from the palette entry. This means that if you want to use the same base color with different transparency levels across your project, you need to define a new palette entry for every variation. That’s certainly workable (and many people might have no issue or even prefer this), but it would make managing larger palettes or working on a game with many shades less convenient.

Suggested solution: Add a per-entry toggle in the Palette window to determine whether the alpha channel should be enforced.

• When enabled: both RGB and alpha are applied (current & default behavior).
• When disabled: only RGB is enforced, allowing alpha to be set per usage.

Benefits:

• Makes it easy to reuse the same color with different transparency levels.
• Reduces palette duplication.
• Provides flexibility without breaking existing projects or workflows.