Random / surprise colour tool #108

Change the random ‘rainbow’ icon to the shuffle icon. Change the tooltip to “Surprise color” to keep it playful and inline with other apps that young people use.

Icon research:

• Scratch (star), Discord (wand) have an icon with sparkles.
• Spotify, YouTube kids use shuffle icons.
• Fortnite, Roblox have Loot boxes
• Mario Kart has ? item boxes