Actually this is simple.

First step: change the SSID and password of the mini router to the same as your Netgear. After doing this it should be OK. Your devices should be able to roam between the routers.

Second step: if you do want the mini router bridge to the Netgear, you can set up bridge mode of the mini router using the UI, then use the switch to switch to bridge mode. After doing this roaming should be faster and all of devices always connect to the same router.