Clutch pedal goes to the floor and doesn't work. Heard something break. What do I need to look at?

The clutch being on the floor says the slave cylender, or pilot bearing for the clutch is faulty. The vehicle should still start if you put it in neutral, it just can't be driven. Unsure about the windows.

I am not a mazda guy but it sounds like the pressure plate is bad. Have you check the clutch linkage to be sure something did not slip or break. If so I would be looking at the clutch pressure plate.

Hydraulic fluid is breaking down, remove all fluid, flush out all old fluid and fill with proper fluid new, this will solve your problem

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It has air bubbles on the piping, fill the deposit with brake solution, and push and pull the clutch pedal with your hand it doesn't matter if it goes straight to the floor if that happens pull it with your hand, repeat that as if you are bleeding it up, then disconnect the piping beneath the car, the air bubbles will be forced out, then reconnect the piping and repeat the procedure, push and pull the clutch pedal like a 100 times, then disconnect the piping and reconnect. The clutch pedal should be able to go back when there is no air on the piping. If that doesn't work, replace your clutch pump

No sorry to be the bearer of bad news but i think the fingers on the clutch are worn to excess and when the clutch is depressed fully the bearing is going through the fingers of the clutch causing the noise you can hear .Eventualy it will need a new clutch which is not expensive if you do it yourself

I believe your pressure plate is broken and at a minimum will have to be replaced along with the clutch disk.

check the fluid level in the slave cylinder, near the master cylinder where break fluid goes in, if it is empty, fill it with hydrolic fluid...you may have to bleed the lines at the tranny if you ran it out which it sounds like.

JB weld will not work get it welded by a pro with the proper hi frequency welder otherwise you will have to replace the box ,and yes get a new cylinder ,hope you get sorted

there is a plastic clip that connects the clutch pedal to the rod that goes to the master cylinder, chances are that it let go. Bad thing is that it is only available from GM along with the rod. It is around 50

just have the linkage checked , busted cable sounds like, then look for reasons why as well, ex. why did it break, worn , frayed, something froze up on throttle plate