feat: redesign opfor hunt --ui dashboard

[achuvyas-kv]

Area

Autonomous mode (opfor hunt)

Problem

The current hunt UI lacks visual polish and doesn't effectively communicate the attack tree structure during autonomous red-teaming sessions.

Goals

• Modern dark theme consistent with extension design
• Clearer attack tree visualization (commander → operator → scout)
• Better progress indicators and status cards
• Live-updating transcript with collapsible sections
• Responsive layout

Acceptance criteria

• Dashboard renders attack tree hierarchy visually
• Real-time progress updates without page refresh
• Collapsible transcript sections per attack path
• Works on common viewport sizes (1280px+)