Virginia template cleanup confirmation

Removed from DOM:
- Search & Filter heading
- metrics boxes
- footer / footer statistics

Disabled in app.js:
- renderMetrics writing
- footerStats writing
- old header-collapsed toggle class

Preserved:
- working MapLibre / Esri map code
- app.js map initialization
- data structure
- quick search logic

Added:
- persistent masthead toggle outside the header
- Ned Streater record if not already present
- stylesheet hard lock hiding construction overlays/popups
