fix: avoid auto re-locking scroll after tasks

static/src/app.ts

@@ -1228,9 +1228,6 @@ const appOptions = {
                     }
                 });
                 
-                // 重置滚动状态
-                this.chatEnableAutoScroll();
-                
                 // 清理Markdown缓存
                 if (this.markdownCache) {
                     this.markdownCache.clear();
@@ -2219,8 +2216,9 @@ const appOptions = {
                 this.inputClearMessage();
                 this.inputSetLineCount(1);
                 this.inputSetMultiline(false);
-                this.chatEnableAutoScroll();
-                this.scrollToBottom();
+                if (this.autoScrollEnabled) {
+                    this.scrollToBottom();
+                }
                 this.autoResizeInput();
                 
                 // 发送消息后延迟更新当前上下文Token（关键修复：恢复原逻辑）

static/src/stores/chat.ts

@@ -329,7 +329,6 @@ export const useChatStore = defineStore('chat', {
       this.currentMessageIndex = -1;
       this.streamingMessage = false;
       this.clearExpandedBlocks();
-      this.enableAutoScroll();
       this.clearThinkingLocks();
     }
   }