Add highlight to show active chats/agents in app left menu

[peckinpah]

Like the title says :-)

It's hard to see which chats/agents are actively generating responses - it would improve glanceability if chats/agents where highlighted with a spinning icon / bold font / colour in the left menu

[lojza3d]

PR created: #536 - hopefully it'll be merged soon 😉

[peckinpah]

Awesome! 🙏