So what happens in November if Trump claims that "Chinese disinformation" or "Chinese Communist Party hacking" caused him to lose a few swing states & he wont therefore recognize the results?

Or what happens in November if Trump squeaks out a victory, but there's evidence of disenfranchisement & miscounting of mailed-in ballots and therefore Trump opponents won't recognize the recognize the results?

In either scenario, what if the alleged losing side tries to use the courts to overturn the alleged vote outcome? Will the courts act? Will the Supreme Court overturn an election result, even if there's real evidence of wrongdoing?

In either scenario, what if the alleged losing side call on supporters to mobilize in the streets? To defend the White House? Or to throw out the occupant in the White House?

These are very low probability events. But they are not zero probability events.