Hi, quick question> When waking up laptop from sleep with networked applications open, would non-VPN traffic leak to any applications before the VPN can connect back, or does the kill switch feature prevent this? (Linux)
The kill switch should prevent it.
But if you want absolute certainty, you can set up Mullvad with Wireguard via the terminal following the instructions they have on their website.
Simply add the additional lines of code and add the config file in your etc and Wireguard folders.
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honestly from experience, you should not rely on the killswitch of vpn clients. They are largely unreliable.
If it is really important for you i would layer your defense by configuring a vpn on router level.
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Doesn’t that mean it can still leak on the router level no?
it could depending on the quality of your router 
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And that’s why via the terminal on the OS level is the best way to go about it since it goes give you some device and location flexibility (albeit on a DIY level) - on Linux at least.
I think that the lockdown mode does something like what you mentioned, internet connectivity is fully blocked until you reconnect to the VPN, but that breaks split tunneling which is important to me.