Enhanced Async Agent Details Panel

What: The async agent monitoring panel now shows significantly more information about running agents.

New features:

• Real-time task progress tracking with completion counters
• Token usage display (total tokens consumed)
• Tool use count tracking
• Recent activity feed showing current agent operations
• Increased prompt preview from 200 to 300 characters

Details:

• Integrates with todo state for task tracking
• Shows "Tasks (X/Y)" with completion progress
• Displays token and tool counts in status line
• Evidence: O29() at line ~468985 replaces older PQ9() function