save and load theme using settings api

[yashschandra]

No description provided.

[CLAassistant]

All committers have signed the CLA.

[yashschandra]

resolves #4432

[pawelangelow]

First of all, thanks for your work!
It's always great to see people engage in the process with fresh ideas and perspectives - I really appreciate it. 🙏 🍺

Second, apologies for the delay.

Third, now that the requirements are clear, the changes make sense and look good overall. 🚀
I just have a few comments related to code style. Here's what I suggest:

• Rebase onto the latest main
• Go through the comments
• Add some unit tests

I'm happy to help with any (or all) of these steps - just let me know!

[yashschandra]

First of all, thanks for your work! It's always great to see people engage in the process with fresh ideas and perspectives - I really appreciate it. 🙏 🍺

Second, apologies for the delay.

Third, now that the requirements are clear, the changes make sense and look good overall. 🚀 I just have a few comments related to code style. Here's what I suggest:

• Rebase onto the latest main
• Go through the comments
• Add some unit tests

I'm happy to help with any (or all) of these steps - just let me know!

Restructured code as suggested

[pawelangelow]

@yashschandra I opened a PR with a few additional tweaks and polish to complement your changes. yashschandra#1

[yashschandra]

@yashschandra I opened a PR with a few additional tweaks and polish to complement your changes. yashschandra#1

@pawelangelow Merged your changes. Also removed unnecessary update settings call. Please check now.

[pawelangelow]

Thanks for your time and cooperation on this PR! 🙏