Add dropdown for selecting display output instead of manual text entry

[luca4]

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Feature Request

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Right now you have to manually copy the display name from the troubleshooting logs and paste it into the output_name_windows field. It's kind of a pain. You have to switch between tabs to find the right value.

What I'm suggesting is could we get a dropdown menu for this setting that shows the detected displays? Something like:
Select Display:
[ Acer X34A (\.\DISPLAY1) - 3440x1440@100Hz ▼ ]
VDD by MTT (\.\DISPLAY10) - 1920x1080@60Hz
The info is already there in the troubleshooting tab, so it seems like it would just need to populate a dropdown with the same data.

I was setting up a virtual display for streaming and it took me a while to figure out I needed to grab display number from the logs instead of just typing DISPLAY2 or something, so it should be a great improvement

Let me know what you think!

Environment:
Windows 11
Sunshine version 2025.924.154138

[ReenigneArcher]

It's on our roadmap: LizardByte/roadmap#23