Add visual indicator for active agent type in chat UI

[blink-so]

Feature Request

Add a colorful visual indicator in the chat UI to show which agent is currently running (Claude, Goose, Aider, Codex, or Custom).

Current State

The chat UI shows server status (online/offline) but doesn't indicate which specific agent type is active.

Proposed Enhancement

Add a visual element (colored badge, icon, or indicator) in the header that:

• Shows the current agent type (claude, goose, aider, codex, custom)
• Uses distinct colors for each agent type for quick visual identification
• Complements the existing server status indicator

Implementation Notes

• Agent type is already detected in cmd/server/server.go via parseAgentType()
• Could be exposed via the existing /status endpoint or new API endpoint
• UI location: likely in the header component alongside the current status indicator
• Should integrate with the existing design system and dark/light mode toggle

Benefits

• Quick visual confirmation of which agent is active
• Helpful when switching between different agent types
• Improves user experience with colorful, intuitive interface

[bpmct]

This is my feature request btw!

[35C4n0r]

@bpmct, seems like a quick fix. Should we keep the colors hardcoded ?

[bpmct]

Colors being hardcoded works for me!

[matifali]

@bpmct I think we should not be opinionated about Colors, and having the agent name would be enough.