Ranked play: Add toggle to discard cards even though you didn't press the discard button.

[GabuTheDev]

would fix these kind of scenarios (see video). I was a few ms late. you can see the cursor showing that I did click right after the button disappeared.

I'm thinking automatically discarding the selected cards while also having the button there makes no sense for the regular user, so a toggle could do.

This could also be fixed be either increasing the discard time or adding an audio warning that the timer is soon to finish (like a metronome type of sound for the last 3 seconds).

tte45yhrcz.mp4

[peppy]

cc @smoogipoo

i kinda hinted at this being required from the first implementation. still feel like it should probably be.