feat: prevent form submission during IME composition in ChatInterface and ConfigDialog

src/app/components/ChatInterface.tsx

@@ -121,6 +121,9 @@ export const ChatInterface = React.memo<ChatInterfaceProps>(({ assistant }) => {
   const handleKeyDown = useCallback(
     (e: React.KeyboardEvent<HTMLTextAreaElement>) => {
       if (submitDisabled) return;
+      // Don't submit while an IME is composing (e.g. pressing Enter to pick a
+      // Chinese/Japanese/Korean candidate must confirm text, not send).
+      if (e.nativeEvent.isComposing || e.keyCode === 229) return;
       if (e.key === "Enter" && !e.shiftKey) {
         e.preventDefault();
         handleSubmit();

src/app/components/ConfigDialog.tsx

@@ -96,7 +96,8 @@ export function ConfigDialog({
                 if (error) setError(null);
               }}
               onKeyDown={(e) => {
-                if (e.key === "Enter") handleSave();
+                if (e.key === "Enter" && !e.nativeEvent.isComposing)
+                  handleSave();
               }}
               aria-invalid={error ? true : undefined}
               aria-describedby={error ? "deploymentUrl-error" : undefined}