feat(gui): netwerk tab netwerk layout grafisch

webui/html/assets/css/app.css

@@ -487,4 +487,88 @@ pre{
   font-size: 11px;
   margin-left: 4px;
   opacity: .75;
-}
+}
+/* ===== Netwerken: Tabel/Kaart toggle + kaart placeholders (STAP 3A-1) ===== */
+.segToggle{
+  display:inline-flex;
+  border:1px solid rgba(255,255,255,0.12);
+  background: rgba(255,255,255,0.04);
+  border-radius: 12px;
+  overflow:hidden;
+}
+
+.segToggle .seg{
+  appearance:none;
+  border:0;
+  background: transparent;
+  color: inherit;
+  padding: 8px 10px;
+  font-size: 13px;
+  line-height: 1;
+  cursor:pointer;
+  opacity: .85;
+}
+
+.segToggle .seg:hover{ opacity: 1; }
+
+.segToggle .seg.active{
+  background: rgba(255,255,255,0.08);
+  opacity: 1;
+}
+
+.mapHost{
+  border: 1px solid rgba(255,255,255,0.10);
+  background: rgba(0,0,0,0.18);
+  border-radius: 14px;
+  min-height: 420px;
+  overflow: hidden;
+}
+
+.mapLegend{
+  margin-top: 10px;
+  padding: 10px 12px;
+  border: 1px solid rgba(255,255,255,0.10);
+  background: rgba(0,0,0,0.18);
+  border-radius: 14px;
+  max-width: 360px;
+}
+
+.mapLegend .legendTitle{
+  font-weight: 700;
+  margin-bottom: 8px;
+}
+
+.mapLegend .legendRow{
+  display:flex;
+  align-items:center;
+  gap: 10px;
+  margin: 6px 0;
+}
+
+.mapLegend .legendSwatch{
+  width: 14px;
+  height: 14px;
+  border-radius: 6px;
+  display:inline-block;
+  border: 1px solid rgba(255,255,255,0.14);
+}
+
+.mapLegend .legendSwatch.link{
+  width: 18px;
+  height: 2px;
+  border-radius: 2px;
+  border: 0;
+  background: rgba(255,255,255,0.22);
+}
+
+.mapLegend .legendSwatch.shared{
+  width: 18px;
+  height: 2px;
+  border-radius: 0;
+  border: 0;
+  background: rgba(255,255,255,0.22);
+  background-image: repeating-linear-gradient(90deg, rgba(255,255,255,0.22), rgba(255,255,255,0.22) 6px, transparent 6px, transparent 10px);
+}
+
+.mapLegend .legendSwatch.net{ background: rgba(80,160,255,0.35); }
+.mapLegend .legendSwatch.ctr{ background: rgba(150,230,150,0.30); }