Ability to customize label colors

Problem Statement

Current label color are quite similar (green/red) on my monitor. I would like to have a bright blue label for example. Also colorblind people might be affected by this predefined set of colors.

Proposed Solution

Ability to change each label color with any hex number.

Alternative Solutions

Custom css

Relevant Context

N/A

Does this feature align with Kaneo's focus on simplicity?

Yes, simple color picker should not overcomplicate the UI or general philosophy of using the app.

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Originally requested by @skibbipl on 2026-08-11. Original GitHub request #1557.