feat: allow custom signature

app/javascript/react-components/doc.md

@@ -134,6 +134,7 @@ interface ChatwootProviderProps {
   pubsubToken?: string;   // PubSub authentication token
   disableUpload?: boolean; // Disable file attachments
   disableEditor?: boolean; // Disable reply editor
+  signature?: string;      // Custom message signature (overrides user profile signature)
 }
 ```
 
@@ -147,6 +148,7 @@ window.__PUBSUB_TOKEN__       // Real-time auth token
 window.__WOOT_CONVERSATION_ID__ // Active conversation
 window.__EDITOR_DISABLE_UPLOAD__ // Upload flag
 window.__DISABLE_EDITOR__     // Editor flag
+window.__WOOT_CUSTOM_SIGNATURE__ // Custom signature (overrides profile)
 window.__WOOT_ISOLATED_SHELL__ // Disables audio notifications
 window.__CHATWOOT_STORE__     // Vuex store reference
 window.WootConstants          // Global constants

app/javascript/react-components/src/components/ChatwootProvider.jsx

@@ -18,6 +18,7 @@ export const ChatwootProvider = ({
   conversationId,
   disableUpload,
   disableEditor,
+  signature,
   children,
 }) => {
   const isInitialized = useRef(false);
@@ -41,6 +42,7 @@ export const ChatwootProvider = ({
     disableUpload: disableUpload || false,
     websocketURL: websocketURL,
     pubsubToken: pubsubToken,
+    signature: signature || '',
   };
 
   function initializeChatwootGlobals() {
@@ -57,6 +59,7 @@ export const ChatwootProvider = ({
     window.__WOOT_CONVERSATION_ID__ = config.conversationId;
     window.__EDITOR_DISABLE_UPLOAD__ = config.disableUpload;
     window.__DISABLE_EDITOR__ = config.disableEditor;
+    window.__WOOT_CUSTOM_SIGNATURE__ = config.signature || undefined;
     window.__WOOT_ISOLATED_SHELL__ = true;
     /* eslint-enable no-underscore-dangle */
 
@@ -87,6 +90,16 @@ export const ChatwootProvider = ({
     config.pubsubToken,
   ]);
 
+  // Keep signature global in sync when the prop changes after init
+  useEffect(() => {
+    const value = signature || undefined;
+    // eslint-disable-next-line no-underscore-dangle
+    window.__WOOT_CUSTOM_SIGNATURE__ = value;
+    window.dispatchEvent(
+      new CustomEvent('chatwoot:signature-change', { detail: value || '' })
+    );
+  }, [signature]);
+
   if (!initializationComplete) {
     return null;
   }