Improvements to the UX

[cstromblad]

Having spent some time exploring the code, I decided to take it upon myself to attempt some redesign and refinements of the UX. Here are the changes I've made:

Main window:

1. I've removed some spacing around the button layout, and added a subtle bounding box.
2. Title is the currently selected Stream Deck, and only selectable if there are more devices present.
3. Profile selection has a customized box and profile selector matching the "main theme" of the app.
4. Button configuration is only displayed when there's an actual button selected.

• The menu system has a "live" profile of the device, dynamically calculated and highlighted to show which keys are actually configured.
• Plugins and settings have been moved here, and a little About item has been added at the bottom.

- The settings page have been redesigned to group similar items, style them and do some alignment of options etc.

• And a slight redesign to the Plugin Buttons list on the right side to make it "harmonize" a bit more with the other pages and settings of the app.

If you like these changes I would be happy to put forward a PR.

[nekename]

I'm sorry, I wouldn't have the bandwidth to review such a large PR any time soon, especially considering that it seems mostly or entirely AI-generated, which from my experience entails large changesets and code inconsistent with project conventions.

[cstromblad]

I understand, and fully respect your decision. I will retain the changes for my own use until a future where these changes would be accepted! Thanks for considering!

[nekename]

Thank you for understanding.

[cstromblad]

(Just wanted to add that the change is cosmetic only, and does not introduce new functionality! There's only layout changes, etc.)