Fix: Prevent Enter key from submitting during IME composition

When using an Input Method Editor (IME) for Chinese, Japanese, or Korean
input, pressing Enter should confirm the IME composition rather than
submit the chat message. This fix adds a check for isComposing to ignore
Enter key presses during active IME composition.

Co-authored-by: openhands <openhands@all-hands.dev>

frontend/src/components/features/conversation-panel/conversation-card/conversation-card-title.tsx

@@ -30,6 +30,10 @@ export function ConversationCardTitle({
           onSave(trimmed);
         }}
         onKeyUp={(event: React.KeyboardEvent<HTMLInputElement>) => {
+          // Ignore Enter key during IME composition (e.g., Chinese, Japanese, Korean input)
+          if (event.nativeEvent.isComposing) {
+            return;
+          }
           if (event.key === "Enter") {
             event.currentTarget.blur();
           }

frontend/src/components/features/conversation/conversation-name.tsx

@@ -91,6 +91,10 @@ export function ConversationName() {
   };
 
   const handleKeyUp = (event: React.KeyboardEvent<HTMLInputElement>) => {
+    // Ignore Enter key during IME composition (e.g., Chinese, Japanese, Korean input)
+    if (event.nativeEvent.isComposing) {
+      return;
+    }
     if (event.key === "Enter") {
       event.currentTarget.blur();
     }

frontend/src/hooks/chat/use-chat-input-events.ts

@@ -68,6 +68,12 @@ export const useChatInputEvents = (
         return;
       }
 
+      // Ignore Enter key during IME composition (e.g., Chinese, Japanese, Korean input)
+      // When using IME, Enter is used to confirm the composition, not to submit
+      if (e.nativeEvent.isComposing) {
+        return;
+      }
+
       if (checkIsContentEmpty()) {
         e.preventDefault();
         increaseHeightForEmptyContent();