fix(overlay-panel): menu bar clipping showing up on secondary monitor

[Hephaest]

Background

I have been using Ice for a couple of months, and I love it. The only thing that made me feel uncomfortable was the issue that was frequently mentioned in the community – menu bar clipping, which always floated on my external monitor when I turn my laptop's window full screen.

Since it's still not fixed yet, I would like to help and do a hotfix.

Notes

• I'm not an iOS developer (I have little knowledge but not much), so I ask AI for help.
• I have done self-testing on my laptop and tried to fix this with minimal risk impact.
• I have left useful comments on the code change so that it could help the team better understand why this fix matters.

Related Issues

• Menu bar in middle of screen #445
• [Bug]: Background visible when entering fullscreen on video. or other application #521
• [Bug]: Split view broke with extended screens #541
• [Bug]: <UI Bar Appearing on Main Display When Playing Fullscreen Video on Extended Display> #576
• Random bar in the middle of the screen #609
• [Bug]: <bug title> Shows weird bar when connected to monitor #636
• [Bug]: <Menu bar clipping showing up on secondary monitor> #663
• [Bug]: Searchbar-like Artefact Upon Full-Screen #772

[Hephaest]

This ensures the panel is validated before being shown. If it is in full-screen mode, it should be hidden.

[Hephaest]

Explain the necessity of the fixes.

[Hephaest]

Hi Jordan @jordanbaird

Feel free to review my PR and make any adjustments to align it with your best coding practices. Hope this fix could be helpful for the community :)