Live wall: pinned/docked cameras stop when their provider is switched off; admin-only empty-state CTA

- LiveView: localStorage pins carry image URLs, so they rendered (without
  credit) after an admin disabled the provider. Pins now show only while
  their provider is serving (server-26#198 licence gating).
- MapView: pinned/docked map players drop out once their provider leaves
  the serving list; credits are kept from the last answer so docked players
  keep attribution while the overlay is hidden.
- WallPanels: the "no camera provider enabled" link to /admin was a dead CTA
  for non-admins (bounced to /). Link shown to admins only, deep-linked to
  /admin#cameras; the admin page now honours a tab hash.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

drb-frontend/components/live/WallPanels.tsx

@@ -10,6 +10,7 @@ import type {
   AircraftTrack, CallRecord, Camera, CameraCredit, CameraProviderFeed, IncidentRecord, Ny511Event, NodeRecord, VesselTrack,
 } from "@/lib/types";
 import { isKnownSeverity, SEVERITY_COLORS, SEVERITY_LABEL } from "@/lib/severity";
+import { useAuth } from "@/components/AuthProvider";
 import { CameraFeed } from "@/components/CameraFeed";
 import { MachineOutputNotice } from "@/components/ui/MachineOutputNotice";
 import { SourceCredit, fetchedLabel } from "@/components/SourceCredit";
@@ -43,11 +44,15 @@ export function CameraTile({ cam, feed, km, onOpen }: { cam: Camera; feed?: Came
 }
 
 function NoCameras({ servingCount, radiusKm }: { servingCount: number; radiusKm: number }) {
+  // Only admins can open /admin (everyone else is bounced to /), so only they get the link.
+  const { isAdmin } = useAuth();
   return (
     <p className="text-xs text-ink-muted">
-      {servingCount === 0
-        ? <>No camera provider is enabled. An admin turns them on under <Link href="/admin" className="underline">Admin → Camera providers</Link>.</>
-        : `No public camera within ${radiusKm} km.`}
+      {servingCount !== 0
+        ? `No public camera within ${radiusKm} km.`
+        : isAdmin
+          ? <>No camera provider is enabled. Turn one on under <Link href="/admin#cameras" className="underline">Admin → Camera providers</Link>.</>
+          : "No camera provider is enabled. A platform admin can turn them on."}
     </p>
   );
 }