Z-Stack-firmware VS core

cc2530, CC2531, etc.: I found many using/reflashing these as gateways or routers and there is a repository of firmwares for that, but did not find anything about using them to build implement end devices (sensors/actors).

It'll be one of the ones listed here: https://github.com/Koenkk/Z-Stack-firmware/blob/master/coordinator/README.md

Have you read the readme in the coordinator folder? That is probably the info you're looking for: https://github.com/Koenkk/Z-Stack-firmware/tree/master/coordinator

Is it possible to use the Sonoff Zigbee 3.0 USB Dongle Plus-P as a ZigBee sniffer? I downloaded Packet-Sniffer-2 and flashed it with the cc26x2r1lp/sniffer_fw.hex (at first using cc2538-bsl.py, then later using TI's Flash Programmer 2 and the cJTAG pins), but the Sniffer Agent doesn't see it. TI's supported hardware list includes the CC2652R, but not CC2652P, but I was hoping they'd be similar enough that the same firmware would work. But on the other hand, the Z-Stack firmware for the two chips are different.

Sonoff Zigbee USB Dongle 3.0 based on TI CC2652P+CP2002N (flashed with the latest firmware 'Z-Stack-Firmware CC1352P2_CC2652P_launchpad_coordinator_20220219.zip for coordinator' using 'TI flash programmer 2',

ZigBee can do way more than 32 devices depending on what coordinator you use. With a modern cc2652 based coordinator you can do 100s of devices. See the routes column (and explanation) in the table on https://github.com/Koenkk/Z-Stack-firmware/blob/master/coordinator/README.md

I succesfully flashed the stick (CC1352P2_CC2652P_launchpad_coordinator_20220219.zip)

This device just plugs in and acts as your coordinator. Here is the latest firmware if you need it the factory firmware may be sufficient: https://github.com/Koenkk/Z-Stack-firmware

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Use online code editors such as Codesandbox or Stackblitz. They let you focus on writing code rather than dealing with local environment complexities.

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I've started learning React and was using stackblitz.com. which is good but I got into some limitations like not being able to upload my own images.

For a few years I have been aware of on-line development environments such as JSBin, JSFiddle and CodePen. They have spearheaded on-line development and more recently a new breed of on-line resources have become available including CodeSandbox, Stackblitz and Replit. You can even access your GitHub repos directly through an in-browser (web) version of MS Visual Studio Code by pressing the full-stop (try it in one of your own repos). Of course there are also cloud offerings from Amazon, Google, Microsoft, etc. but they require a little more configuration and setup than I was happy to incur. Finally, there are two relatively new offerings in this space in the form of GitPod and GitHub Codespaces. I have signed up but not yet explored what they have to offer.