I’ll do my best to answer according to my understanding.
Yes. Sqllite wasm library is included which will maintain all the functionality but a 10mb limit on storage.
Yes. I do this now
If you mean “webapp” then as per answer 1. If native, my understanding is that functionality has not changed and still can use sqllite. You’ll need someone more experienced than I to confirm the native sqllite usability.
For native apps (compiled by VoltBuilder), you use a plugin to get SQLite support. No changes are needed to your code, and it works very well on both Android and iOS.