Support 4K (3840x2160) resolution export for screen recordings

[gbw8848]

Is your feature request related to a problem? Please describe.
I use a 4K (3840x2160) monitor for my daily work, but currently Recordly only supports 1080p (1920x1080) export resolution. When I record my 4K screen and export it, the video gets downscaled to 1080p, which loses a lot of detail and makes the final recording look blurry, especially for text and UI elements. This is really frustrating when I need to share high-quality screen recordings.

Describe the solution you'd like
I'd like to request adding support for 4K (3840x2160) resolution export in Recordly. Specifically:

1. Add 4K (3840x2160) as an optional resolution in the export settings
2. Automatically detect the native resolution of the user's display and set it as the default export option
3. Ensure the exported video maintains the original aspect ratio and pixel clarity of the 4K screen

Describe alternatives you've considered

• I've tried manually upscaling the 1080p export to 4K with video editing software, but it doesn't restore the lost detail and results in poor quality.
• I've also considered using other screen recording tools that support 4K, but I prefer Recordly's UI and workflow, so I'd love to keep using it with 4K support.

Additional context
My display resolution is 3840x2160 (4K UHD), and I believe many other users with high-resolution monitors would also benefit from this feature. Adding 4K export would make Recordly a more versatile tool for professional screen recording needs.