Muted color normalized

[FranciscoMoretti]

I noted that in most places where the muted color was used, it was used as muted/50.

This had unintended consequences related to transparency like this one:

Explanation:

• Window has zoom
• Chat background is bg-muted/50
• Input should have the same color as chat background, but if bg-muted/50 is applied, it keeps 50% transparency.
• Solution: use bg-muted with no transparency for input

Changes:

• bg-muted/50 replaced by bg-muted
• Adjusted muted to have the same color as the previous muted/50

Components under components/ui still have the muted/[num] classes