feat(message): add embedded mode to ChatScreen for desktop dual-column layout

Replace EmbeddedChat with unified ChatScreen supporting embedded mode through props. Pass conversation data, layout constraints, and navigation callbacks directly to ChatScreen instead of using separate embedded component. Consolidates dual-column layout logic into single component with conditional rendering based on isEmbedded prop.

src/screens/message/components/ChatScreen/useChatScreen.ts

@@ -40,11 +40,12 @@ import {
   ChatRouteParams,
   MenuPosition,
   PendingChatAttachment,
+  ChatScreenProps,
 } from './types';
 import { TIME_SEPARATOR_INTERVAL, MEMBERS_PAGE_SIZE, MAX_PENDING_CHAT_IMAGES } from './constants';
 import { messageRepository } from '@/database';
 
-export const useChatScreen = () => {
+export const useChatScreen = (props?: ChatScreenProps) => {
   const getSendErrorMessage = useCallback((error: unknown, fallback: string) => {
     if (error instanceof ApiError && error.message) {
       return error.message;
@@ -60,7 +61,17 @@ export const useChatScreen = () => {
     groupName?: string | string[];
   }>();
   // 路由参数（动态段 + query）；群 ID 勿用 Number()，避免超过 2^53-1 时精度丢失
+  // 嵌入式模式下优先使用 props，否则从路由参数获取
   const routeParams = useMemo(() => {
+    if (props?.embeddedConversationId) {
+      return {
+        conversationId: props.embeddedConversationId,
+        userId: null as string | null,
+        isGroupChat: props.embeddedIsGroupChat ?? false,
+        groupId: props.embeddedGroupId ?? null,
+        groupName: props.embeddedGroupName ?? null,
+      };
+    }
     const isGroupFlag = firstRouteParam(rawParams.isGroupChat);
     return {
       conversationId: firstRouteParam(rawParams.conversationId) ?? null,
@@ -70,6 +81,10 @@ export const useChatScreen = () => {
       groupName: firstRouteParam(rawParams.groupName),
     };
   }, [
+    props?.embeddedConversationId,
+    props?.embeddedIsGroupChat,
+    props?.embeddedGroupId,
+    props?.embeddedGroupName,
     rawParams.conversationId,
     rawParams.userId,
     rawParams.isGroupChat,