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On most vehicles only the driver's side window has the auto up/down function

P0303 is misfire on cylinder 3, since you say the plug and coil packs are good it is likely a dirty or faulty fuel injector. You could try swapping the cylinder 3 fuel injector to a different cylinder and if the code follows, it will tell you the fuel injector was the issue.

there are a few on ebay right now

https://www.ebay.com/itm/New-Front-Driver-Side-Plastic-Splash-Shield-For-Mazda-3-Sport-2010-2013/272934215144?hash=item3f8c259de8:g:~iAAAOSwC-taC-JZ

"some models" means Canadian models

No you need to have the key fob to start the vehicle, the auxiliary key just unlocks the door. The auxiliary key is just used for when the key fob battery goes dead and you can't unlock the doors. You hold the key fob next to the start button to start the vehicle.

this is what I do -Settings -manage files -choose file -upload -click on file name -copy url -click on "insert image" icon -paste url done

press the black button right next to it see if it goes off

Many things can throw the p0172 the most common being a dirty or faulty MAFS, I suggest cleaning it with CRC MAFS cleaner and see if that helps.

Batteries these days seem to last only about 3 to 4 years

https://www.youtube.com/watch?v=ASxEuKdN8SM

yes it is a combination backup/neutral safety switch

Yes most likely the neutral safety switch, you can get an aftermarket switch online for around $20-$50. https://www.carparts.com/details/Mazda/3/Replacement/Neutral_Safety_Switch/2008/i/4_Cyl_2-dot-0L/RM50640002.html?showfitment=true Should be located just above the transmission oil pan.

https://www.carcoversfactory.com/suv-covers/2019/mazda/cx-5/all-body-types/basic-edition-suv-cover?gclid=EAIaIQobChMI-5WYjpHq4wIVS18NCh3XzgkZEAYYBCABEgKUy_D_BwE

dirty fuel filter?

go to the crutchfield website they will show you exactly what you need https://www.crutchfield.com/car/carselector.aspx?lp=%2fcar%2foutfitmycar%2fmycar.aspx by the way, you posted this in the wrong place

a little rubbing compound will do it

Car will be fine, if it were winter right now a battery tender might a good idea but not needed in the summer.

did you read the code or codes with an obd2 scanning tool?

Maybe you should consider doing your own oil changes in the future.