Add onboarding weather and template gradients

src/player/runtime.js

@@ -32,6 +32,21 @@ function createPlayerRuntime(options) {
   const announcementListenersBySlug = new Map();
   const wss = new WebSocketServer({ noServer: true });
 
+  function hasActiveClientId(clientId, currentConnection) {
+    const normalizedClientId = String(clientId || '').trim();
+    if (!normalizedClientId) {
+      return false;
+    }
+    for (const connections of connectionsBySlug.values()) {
+      for (const connection of connections.values()) {
+        if (connection !== currentConnection && String(connection.clientId || '').trim() === normalizedClientId) {
+          return true;
+        }
+      }
+    }
+    return false;
+  }
+
   function normalizeClientIp(value) {
     const ip = String(value || '').trim();
     if (!ip) {
@@ -534,7 +549,13 @@ function createPlayerRuntime(options) {
         return;
       }
 
-      connection.clientId = payload.clientId ? String(payload.clientId).trim() : connection.clientId;
+      const nextClientId = payload.clientId ? String(payload.clientId).trim() : connection.clientId;
+      if (nextClientId && hasActiveClientId(nextClientId, connection)) {
+        socket.send(JSON.stringify({ type: 'client-id-conflict' }));
+        socket.close(4009, 'Client ID is already in use.');
+        return;
+      }
+      connection.clientId = nextClientId;
       connection.clientName = payload.clientName ? String(payload.clientName).trim() : connection.clientName;
       connection.deviceId = payload.deviceId ? normalizeDeviceId(payload.deviceId) || connection.deviceId : connection.deviceId;
       if (!connection.clientName && connection.clientId) {