fix(toolbar): improve toolbar positioning on HiDPI displays

Adjusted the toolbar positioning logic to account for pixel ratio differences in Qt6+XCB environments. The changes ensure that the toolbar remains within screen bounds by applying consistent boundary checks using logical coordinates. This fix addresses potential offscreen positioning issues when the toolbar is displayed on high-DPI screens.

bug: https://pms.uniontech.com/bug-view-354679.html

Author: dengzhongyuan365-dev