chore(realtimekit): updating release notes for 1.4.0 web core sdk release (#30085)

* chore(realtimekit): updating release notes for 1.4.0 web core sdk release

* chore(realtimekit): added compatibility note for mobile sdks

Author: ravindra-cloudflare

src/content/release-notes/realtimekit-web-core.yaml

@@ -3,6 +3,23 @@ link: "/realtime/realtimekit/release-notes/"
 productName: RealtimeKit Web Core
 productLink: "/realtime/realtimekit/"
 entries:
+  - publish_date: "2026-04-20"
+    title: RealtimeKit Web Core 1.4.0
+    description: |-
+      **Compatibility:** Works best with RealtimeKit Android Core 2.0.0+ and RealtimeKit iOS Core 2.0.0+.
+
+      **Features**
+
+      - Added `meeting.__internals__.authToken` to expose authentication token, enabling better integration between Web Core and UI Kit for future features and enhancements.
+
+      **Fixes**
+
+      - Proactively fixed an issue where participants with simulcast turned on would not be able to turn on their camera or microphone due to SDP failures in Chrome version 148+.
+
+      **Enhancements**
+
+      - SDK now uses `*.realtime.cloudflare.com` base URI internally instead of the legacy `dyte.io` base URI.
+      - Refactored error handling to properly catch and display error codes for SDK initialization failures, room join failures, and other errors.
   - publish_date: "2026-03-31"
     title: RealtimeKit Web Core 1.3.0
     description: |-