Network: status reports mask/gw/dns; UI shows the DHCP lease in the static fields

With DHCP on, the greyed-out IP/netmask/gateway/DNS fields show the
addresses in use. Unticking DHCP keeps them as the starting point for a
static setup. (Static addressing itself is not applied yet.)

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

web/index.html

@@ -341,6 +341,13 @@ function read() {
   return out;
 }
 
+// With DHCP on, the greyed-out static fields show what DHCP gave us. Unticking DHCP leaves the values
+// there (a starting point for static addressing) until they are edited.
+function netLive() {
+  if (!f['net.dhcp'].checked || !st.ip) return;
+  for (const k of ['ip','mask','gw','dns']) f['net.' + k].value = st[k] ?? '';
+}
+
 function toggle() {
   PROJECT.toggle?.(f);
   const role = f['ptp.role'].value;
@@ -354,6 +361,7 @@ function toggle() {
   }
   // VLAN split: default route lives on the internet VLAN, so the AES67 side gets no gateway/DNS.
   if (vlan) f['net.gw'].disabled = f['net.dns'].disabled = true;
+  netLive();
   // RTP multicast must be 224.0.2.0 – 239.255.255.255 (same range Riedel Director enforces).
   const m = f['aes67.mcast'], o = m.value.split('.').map(Number);
   const ok = o.length === 4 && o.every(x => Number.isInteger(x) && x >= 0 && x <= 255) &&
@@ -497,6 +505,7 @@ async function poll() {
       ...temps(st.temps)
     });
     showPtp(st.ptp);
+    netLive();
     sdp();
   } catch { table($('status'), {'Device': 'offline'}); showPtp(null); }
 }