Fix: add auto focus to search bar

[Ishidawg]

Closes (maybe) #4956

I think that it's an UX enhancement. Ever time that you open Library, Deals or Wine Manager, it will focus on Search Box, so the user can just type in.

I've run:

• pnpm prettier
• pnpm codecheck

The test was made on Linux using the .appImage build generated by pnpm dist:linux even tho I know that is not necessary.

Screencast_20260429_152356.mp4

Use the following Checklist if you have changed something on the Backend or Frontend:

• Tested the feature and it's working on a current and clean install.
• Tested the main App features and they are still working on a current and clean install. (Login, Install, Play, Uninstall, Move games, etc.)
• Created / Updated Tests (If necessary)
• Created / Updated documentation (If necessary)