Fix Enter handling during IME composition

web/src/components/canvas/canvas-agent-chat-ui.tsx

@@ -2,6 +2,7 @@ import { useEffect, useRef, useState, type ReactNode } from "react";
 import { Button, Tooltip } from "antd";
 import { ArrowUp, CheckCircle2, CircleAlert, ImagePlus, LoaderCircle, UserRound, Wrench, X, XCircle } from "lucide-react";
 
+import { isPlainEnterKey } from "@/lib/keyboard-event";
 import { canvasThemes } from "@/lib/canvas-theme";
 import type { LocalUser } from "@/stores/use-user-store";
 
@@ -198,7 +199,7 @@ export function AgentChatComposer({
                         void onAddFiles(images);
                     }}
                     onKeyDown={(event) => {
-                        if (event.key !== "Enter" || event.shiftKey || event.ctrlKey || event.metaKey) return;
+                        if (!isPlainEnterKey(event)) return;
                         event.preventDefault();
                         void onSubmit();
                     }}