fix(ime): prevent form submission during IME composition steps (#2279)

* fix(ui): prevent form submission during IME composition steps

* chore(gitignore): add IntelliJ IDE files to .gitignore

---------

Co-authored-by: Vikhyath Mondreti <vikhyathvikku@gmail.com>
Co-authored-by: Waleed <walif6@gmail.com>
Co-authored-by: waleedlatif1 <waleedlatif1@users.noreply.github.com>

.gitignore

@@ -67,6 +67,9 @@ start-collector.sh
 # VSCode
 .vscode
 
+# IntelliJ
+.idea
+
 ## Helm Chart Tests
 helm/sim/test
 i18n.cache

apps/sim/app/workspace/[workspaceId]/w/[workflowId]/components/panel/components/copilot/components/user-input/user-input.tsx

@@ -391,7 +391,7 @@ const UserInput = forwardRef<UserInputRef, UserInputProps>(
         if (mentionKeyboard.handleArrowLeft(e)) return
 
         // Enter key handling
-        if (e.key === 'Enter' && !e.shiftKey) {
+        if (e.key === 'Enter' && !e.shiftKey && !e.nativeEvent.isComposing) {
           e.preventDefault()
           if (!mentionMenu.showMentionMenu) {
             handleSubmit()