but people can still trade it on Hive Engine right?

Yes, tokens received as rewards can be withdrawn to Hive Engine and traded.

Since the progress from the Beta will be reset, can I use all the packs I bought and used on the beta again when the actual Game launches?

Yes, the packs you purchase will be 100% there at the official game launch.

As I am a professional Software Tester IRL I would like to ask if there is any reward for finding bugs?

Not sure, but not at the very beginning or during the beta. We plan to release updates often during the beta phase and we know for sure that there will be bugs :)