Nope. Those two amendments have always applied to the States.
Only in the Into the Night/SmarterthanYou/IBDaMann school of constitutional law. Nothing in the Bill of Rights applied to the states until 1925. Basic constitutional law.
The Supreme Court does not have authority to change the Constitution. You are ignoring Article III.
They changed nothing. They ruled the 2nd allows gun registration. It had never been interpreted differently and both state and federal laws include some registration requirements. If I register my gun and I still have it, it was not confiscated.
Into the Night 12/31
Currently, it looks like GA is going to choose Republican electors.
AZ looks like it might also, but seems to be further away from actually choosing.