perf: reduce presence update frequency and fix background tab throttling (#13726)

## Description
Reduces the frequency of update_presence WebSocket calls from the live
chat widget and fixes agents appearing offline when the dashboard is in
a background tab.

## Fixes # (issue)
https://github.com/chatwoot/chatwoot/issues/13720

## Type of change

- [ ] Bug fix (non-breaking change which fixes an issue)


## Checklist:

- [ ] My code follows the style guidelines of this project
- [ ] I have performed a self-review of my code
- [ ] I have commented on my code, particularly in hard-to-understand
areas
- [ ] I have made corresponding changes to the documentation
- [ ] My changes generate no new warnings
- [ ] I have added tests that prove my fix is effective or that my
feature works
- [ ] New and existing unit tests pass locally with my changes
- [ ] Any dependent changes have been merged and published in downstream
modules

app/javascript/shared/helpers/BaseActionCableConnector.js

@@ -6,7 +6,12 @@ const RECONNECT_INTERVAL = 1000;
 class BaseActionCableConnector {
   static isDisconnected = false;
 
-  constructor(app, pubsubToken, websocketHost = '') {
+  constructor(
+    app,
+    pubsubToken,
+    websocketHost = '',
+    presenceInterval = PRESENCE_INTERVAL
+  ) {
     const websocketURL = websocketHost ? `${websocketHost}/cable` : undefined;
 
     this.consumer = createConsumer(websocketURL);
@@ -37,7 +42,7 @@ class BaseActionCableConnector {
       setTimeout(() => {
         this.subscription.updatePresence();
         this.triggerPresenceInterval();
-      }, PRESENCE_INTERVAL);
+      }, presenceInterval);
     };
     this.triggerPresenceInterval();
   }