Summary

Adds MissionControlDashboard.tsx — View openclaw#312, the real-time operator hub for Horizon M1.

What's in this PR

5 sections, all live with mock data + 3s state cycling:

• Live Status Bar — Gateway ONLINE (green pulse), active sessions (+3 trend), active agents, tokens/min — animated ping dots throughout
• Active Sessions Panel (2/4 width) — 5 mock sessions with agent emoji, type badge, current tool, token counts, duration, status (RUNNING/WAITING/ERROR) — cycles states every 3s via useEffect
• Tool Calls In-Flight (1/4 width) — 6 tool calls color-coded by type (exec=amber, read/write=blue, sessions_spawn=violet, message=green, browser=orange) — completed items fade with CSS transition
• Pending Approvals (1/4 width) — 1 mock approval with Approve/Deny buttons (console.log), risk badges, violet badge count on header
• System Event Feed (full width) — 10 mock entries, filterable All/Errors/Warnings/Info tabs, severity icons (critical/error/warning/info), color-coded left border strips

Tech

• Zero new TS errors introduced (MissionControlDashboard.tsx clean)
• Fixed pre-existing AgentOutputDiffViewer.tsx parse error (malformed import A Crosshair)
• lucide-react only, no external deps
• All mock data hardcoded, no websockets

File stats

• 884 lines added (876 new view + 8 lines removed from AgentOutputDiffViewer fix)