Add known/unknown device ratio next to the device count

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

apps/web/src/index.css

@@ -186,6 +186,12 @@ body {
   font-weight: 400;
 }
 
+.device-ratio {
+  color: #8b949e;
+  font-weight: 400;
+  font-size: 0.75rem;
+}
+
 .device-table {
   width: 100%;
   border-collapse: collapse;

apps/web/src/pages/Dashboard.tsx

@@ -65,7 +65,12 @@ export function Dashboard({ username, onLoggedOut }: { username: string; onLogge
       ))}
       <section>
         <h2>
-          Network Devices <span className="device-count">({devices.length})</span>
+          Network Devices <span className="device-count">({devices.length})</span>{" "}
+          {devices.length > 0 && (
+            <span className="device-ratio">
+              {devices.filter((d) => d.known).length} known / {devices.filter((d) => !d.known).length} unknown
+            </span>
+          )}
         </h2>
         <DeviceTable devices={devices} onDeviceChanged={poll} />
       </section>