add darkmode support for https://cypress-debugger.dev/

[tchiaspko]

Description

Currently after you upload a json file to https://cypress-debugger.dev/ in darkmode, the play button(triangle) is invisible.

See the screenshot comparison between the light mode and the dark mode

light mode

dark mode

Example usage

• set the Mac OSX appearance to dark
• run a cypress test with cypress-debugger enabled
• open https://cypress-debugger.dev/ and upload a json file from the dump folder
• notice the play button in not visible in the dark mode
• repeat the same steps with the Mac OSX appearance set to light mode and you will be able to see the play button

expected:
Be able to the play button whether to use the light or dark mode from OSX appearance