Make the selection of non-default state more visible

By making selections more visible, devs will avoid sending prompts to incorrect modes, which is a common issue that many participants in our study mentioned unprompted.

Colors:

• Agent: icon/foreground (Grey)
• Ask scmGraph/foreground4 (Teal)
• Plan scmGraph/foreground4 (Teal)
• Edit scmGraph/foreground4 (Teal)
• Custom scmGraph/foreground5 (Purple)

Current State	Suggested State