fix(GlobalSidebar): Popover 弹窗隐藏面板内部标题

- WatchlistPanel 和 FollowingEventsPanel 传入 hideTitle={true}
- 避免与 PopoverHeader 标题重复显示

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

src/components/GlobalSidebar/index.js

@@ -126,6 +126,7 @@ const CollapsedMenu = ({
                 onStockClick={onStockClick}
                 onAddStock={onAddStock}
                 onUnwatch={onUnwatch}
+                hideTitle={true}
               />
             </PopoverBody>
           </PopoverContent>
@@ -198,6 +199,7 @@ const CollapsedMenu = ({
                 onCommentClick={onCommentClick}
                 onAddEvent={onAddEvent}
                 onUnfollow={onUnfollow}
+                hideTitle={true}
               />
             </PopoverBody>
           </PopoverContent>