Palette Settings

[WallK]

Acceptance Criteria

When user adds a color or opens a pattern without assigned symbols:
    Assign symbols randomly to colors, ensuring uniqueness

Manage button opens color list

Color List:
    Display all colors with their assigned symbols
    Symbols follow pattern settings (actual or black or custom)
    Clicking a symbol opens a popup to select from font symbols
    Clicking a Reassign button reassigns a random symbol to a color (from unused symbols)

Pattern setting are in #54