New: custom color palettes

• Your custom accent can now be a palette of up to 6 colors, instead of a single color.
• The interface uses the first color, and the background particles cycle through all of them.
• New palette editor: click a color to change it, use ✕ to remove it, and + to add a suggested color. Click the color code to copy it. Nothing changes until you press Confirm.
• Your existing custom color is kept and becomes the first color of your palette.

Settings export
• Exported settings files now include your full palette.
• Files exported from earlier versions still import.
• Files exported from this version can't be imported into older versions of FluxTab.

redesign ui

Add somes colors variant and density particles slider