Random polish

[krschacht]

• [x] Esc to stop streaming current reply?
• [x] #378
• [ ] Text is a tiny bit too light and hard to read (especially message body text)
• [x] I want a keyboard shortcut to get back to the home screen when I'm settings screen
• [ ] Rename "Cancel" to "Back" on settings
• [ ] When my initials are "MY" they don't fit in circle so make initials smaller
• [ ] How hard is Cmd+K to implement so I can change conversation and assistants from keyboard?
• [x] Sprinkle comments about keyboard shortcuts throughout the app (can I make an overlay appear when you hold Cmd?)