feat: map overhaul, kiosk mode, RR importer, duplicate system

Map (MapView.tsx):
- Fan/hand-of-cards marker clustering: groups nearby markers by pixel
  proximity (union-find), renders as rotated color cards showing all types
- Pulsing ring CSS animation on recording nodes (pulse-ring keyframe)
- Live incident overlay panel — right sidebar (desktop) / bottom drawer (mobile),
  clickable to flyTo incident location
- Auto-fit button (⤢) fits all markers in view with fitBounds
- "Live · Xs ago" timestamp badge (refreshes every 10s)
- Weather Radar layer (NEXRAD via Iowa Env Mesonet, no API key)
- ADS-B + Meshtastic placeholder layers (off by default)

Map page (map/page.tsx):
- Fullscreen / kiosk toggle: fixed z-50 overlay covers nav, map fills viewport
- lastUpdated tracking passed to MapView for Live timestamp

Systems page (systems/page.tsx):
- Duplicate System button: opens form pre-filled with Copy of <name>
- RadioReference HTML import: file upload → DOMParser validates .rrlblue
  structure, parses talkgroup categories, modal lets user select which
  categories to import, auto-maps RR tags to local tags (law→police, etc.)

drb-frontend/app/map/page.tsx

@@ -1,5 +1,6 @@
 "use client";
 
+import { useEffect, useState } from "react";
 import dynamic from "next/dynamic";
 import Link from "next/link";
 import { useNodes } from "@/lib/useNodes";
@@ -45,12 +46,55 @@ function IncidentCard({ incident }: { incident: IncidentRecord }) {
 
 export default function MapPage() {
   const { nodes, loading } = useNodes();
-  const activeCalls = useActiveCalls();
-  const incidents   = useActiveIncidents();
+  const activeCalls        = useActiveCalls();
+  const incidents          = useActiveIncidents();
+  const [kiosk, setKiosk]               = useState(false);
+  const [lastUpdated, setLastUpdated]   = useState<Date | null>(null);
+
+  // Track when data last refreshed
+  useEffect(() => {
+    if (!loading) setLastUpdated(new Date());
+  }, [nodes, activeCalls, incidents, loading]);
+
+  // Kiosk mode: full-viewport fixed overlay sits above the sticky nav (z-40 → z-50)
+  if (kiosk) {
+    return (
+      <div className="fixed inset-0 z-50 bg-gray-950">
+        <MapView
+          nodes={nodes}
+          activeCalls={activeCalls}
+          incidents={incidents}
+          lastUpdated={lastUpdated}
+        />
+        <button
+          onClick={() => setKiosk(false)}
+          title="Exit fullscreen"
+          className="absolute top-3 left-3 z-[1002] bg-gray-950/90 border border-gray-700 rounded px-3 py-1.5 text-xs font-mono text-gray-300 hover:text-white hover:border-gray-500 transition-colors flex items-center gap-1.5"
+        >
+          <svg width="12" height="12" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2" strokeLinecap="round">
+            <path d="M8 3v3a2 2 0 0 1-2 2H3m18 0h-3a2 2 0 0 1-2-2V3m0 18v-3a2 2 0 0 1 2-2h3M3 16h3a2 2 0 0 1 2 2v3"/>
+          </svg>
+          Exit fullscreen
+        </button>
+      </div>
+    );
+  }
 
   return (
     <div className="space-y-4">
-      <h1 className="text-xl font-bold text-white font-mono">Map</h1>
+      <div className="flex items-center justify-between">
+        <h1 className="text-xl font-bold text-white font-mono">Map</h1>
+        <button
+          onClick={() => setKiosk(true)}
+          title="Fullscreen / kiosk mode"
+          className="text-xs font-mono text-gray-500 hover:text-gray-300 transition-colors flex items-center gap-1.5"
+        >
+          <svg width="13" height="13" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2" strokeLinecap="round">
+            <path d="M8 3H5a2 2 0 0 0-2 2v3m18 0V5a2 2 0 0 0-2-2h-3m0 18h3a2 2 0 0 0 2-2v-3M3 16v3a2 2 0 0 0 2 2h3"/>
+          </svg>
+          Fullscreen
+        </button>
+      </div>
 
       {loading ? (
         <div className="flex items-center justify-center h-96 text-gray-600 font-mono text-sm">
@@ -58,11 +102,15 @@ export default function MapPage() {
         </div>
       ) : (
         <div className="h-[50vh] sm:h-[65vh] min-h-[400px]">
-          <MapView nodes={nodes} activeCalls={activeCalls} incidents={incidents} />
+          <MapView
+            nodes={nodes}
+            activeCalls={activeCalls}
+            incidents={incidents}
+            lastUpdated={lastUpdated}
+          />
         </div>
       )}
 
-      {/* Active incidents — shown even without geocoded location */}
       {incidents.length > 0 && (
         <section>
           <h2 className="text-sm font-semibold text-gray-400 uppercase tracking-wider mb-3">