Agents dashboard page with stats and agent list

Create the agents dashboard page showing all agents from the Agentd daemon.

Dashboard Layout

1. Stats bar (like pipeline): running count, idle count, completed today, total cost today 2. Active agents section: agents with status running/idle, sorted by most recent activity

• Each card: run ID or name, status badge (running/idle), prompt preview (first 80 chars), cost, elapsed time, "view" link
• Running agents show a pulsing green dot
• Idle agents show a yellow dot (waiting for input)

3. Recent agents section: completed/failed/stopped agents, last 20

• Each card: run ID, status badge, prompt preview, cost, duration, error preview if failed

Data Source

• Call GET http://localhost:8400/agents (Agentd daemon API)
• Parse [AgentInfo] JSON response
• Separate into active (running/idle) vs inactive (completed/failed/stopped)

Tech

• HTMX: auto-refresh active agents list every 5s
• Use sharedShellWithSubnav with subnav: "interactive" (active), "pipeline" (link to /pipeline)
• CSS: Reuse pipeline CSS patterns (pl-stats, pl-runs, pl-run, pl-badge)