fix: Fixed compilation failure issue

[Kakueeen]

as title

Log: fix issue

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关键摘要:

• 在新增的 #include <QApplication> 之后应该明确 QApplication 的具体作用，避免不必要的包含。
• 如果 QApplication 不是 symbolbar.cpp 文件中直接使用的类，那么这个包含可能是不必要的。

是否建议立即修改:

• 是，建议确认 QApplication 的包含是否必要，并在必要时进行修改。