Summary by CodeRabbit

• New Features
  • 2D/3D map mode toggle: 2D (OpenLayers) and 3D (Mapbox) with guidance if no token.
  • New interactive 2D layers: country & subdivision choropleths, live coordinate dots, and timeline session overlays with hover tooltips and click-to-filter.
• Refactor
  • Replaced legacy Leaflet maps with OpenLayers across the app; unified map layering and interaction model.
• Style
  • Improved control responsiveness and added border to the sessions panel.
• Chores
  • Removed Leaflet packages and types, added OpenLayers, and removed Mapbox token from environment config.