Make Website Scanner discoverable in sidebar nav.

Deploy Recon was wired at /deploy-recon but buried at the bottom of a non-scrolling sidebar under an opaque label; move it after Crucible, rename to Website Scanner, enable nav scroll, and add route/nav smoke tests plus README.

server/web/src/help/presencePages.ts

@@ -11,8 +11,8 @@ const PAGE_LABELS: Record<string, string> = {
   '/spread': 'Emberwake',
   '/settings': 'Calibrate',
   '/pathtracer': 'Path Tracer',
-  '/deploy-recon': 'Deploy Recon',
-  '/browser-spread': 'Deploy Recon',
+  '/deploy-recon': 'Website Scanner',
+  '/browser-spread': 'Website Scanner',
 };
 
 export function presencePageLabel(path: string): string {