Create mission briefing system

[bondlegend4]

Global ID: VICS-VIZ-004

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Estimated Time: 3-4 days

Problem

Need immersive scenario introduction with context and objectives.

Solution Tasks

• Create BriefingScreen UI
• Display scenario narrative
• Show mission objectives
• List available controls
• Present threat intelligence
• Add optional intel dossiers
• Implement start transition
• Track objective completion

Acceptance Criteria

• Briefing provides context
• Objectives measurable
• Controls list accurate
• Threat intel hints at vectors
• Transition smooth
• Objectives update in HUD