release: v3.15.2 (#1215)

## [v3.15.2] (Sep 6th, 2024)

### Features
- Introduced new `message` event handlers for `onSendMessageFailed`,
`onUpdateMessageFailed`, and `onFileUploadFailed` in the `eventHandlers`
prop of the message input component. These handlers allow developers to
respond to message send, update, and file upload failures.
  * How to use?
  ```tsx
  <Sendbird
    eventHandlers={{
      message: {
        onSendMessageFailed: (message, error) => {
// You can use the message parameter to create specific conditions
          if (message.isUserMessage()) {
            alert(`Message failed to send: ${error?.message}`);
          }
        },
        onUpdateMessageFailed: (message, error) => {
console.log(`Failed to update message: ${message.messageId}, Error:
${error}`);
        },
        onFileUploadFailed: (error) => {
          console.error('File upload failed', error);
        },
      },
    }}
  ```

### Fixes
- Fixed an issue where the channel UI's scroll did not work after
sending a new message. This issue was specific to the NextJS
environment.

Author: AhyoungRyu

CHANGELOG.md

@@ -1,5 +1,34 @@
 # Changelog - v3
 
+## [v3.15.2] (Sep 6th, 2024)
+
+### Features
+- Introduced new `message` event handlers for `onSendMessageFailed`, `onUpdateMessageFailed`, and `onFileUploadFailed` in the `eventHandlers` prop of the message input component. These handlers allow developers to respond to message send, update, and file upload failures.
+  * How to use?
+  ```tsx
+  <Sendbird
+    eventHandlers={{
+      message: {
+        onSendMessageFailed: (message, error) => {
+          // You can use the message parameter to create specific conditions
+          if (message.isUserMessage()) {
+            alert(`Message failed to send: ${error?.message}`);
+          }
+        },
+        onUpdateMessageFailed: (message, error) => {
+          console.log(`Failed to update message: ${message.messageId}, Error: ${error}`);
+        },
+        onFileUploadFailed: (error) => {
+          console.error('File upload failed', error);
+        },
+      },
+    }}
+  ```
+
+### Fixes
+- Fixed an issue where the channel UI's scroll did not work after sending a new message. This issue was specific to the NextJS environment.
+
+
 ## [v3.15.1] (Aug 29, 2024)
 
 ### Fixes

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@sendbird/uikit-react",
-  "version": "3.15.1",
+  "version": "3.15.2",
   "description": "Sendbird UIKit for React: A feature-rich and customizable chat UI kit with messaging, channel management, and user authentication.",
   "keywords": [
     "sendbird",