Fix: Preloading Fallback Font for slower connections

[arjunjayan999]

This PR resolves issue #4413 and includes changes to improve the loading performance of web pages by preloading fonts.
On slower connections, the material-icons.woff2 font would be loaded later, so the font is preloaded, and is then fetched from disk cache now.

Before

Screen.Recording.2025-02-16.130630.mp4

After

Screen.Recording.2025-02-16.131220.mp4

Performance improvements:

• index.html: Added a link tag to preload the material-icons.woff2 font.
• planet/index.html: Added a link tag to preload the material-icons.woff2 font.

[walterbender]

Works, except sometimes it doesn't?

[arjunjayan999]

@walterbender Been trying to reproduce any issue, can't seem to find any. I have tried multiple times and different browsers, it seems to work fine. Any tips to reproduce this issue? and anything in the console log?

[walterbender]

I will try to reproduce it.

[walterbender]

I cannot reproduce the error.