I just pushed another commit that improves the push notification text a bit. From PR description:
Now for new topics it’ll read:
username created a new topic "title here!" - Marks' Discourse
And for new posts:
username posted in "title here!" - Marks' Discourse
After digging into the code it would be a huge change to have the text read something like: “X posted a new topic in Y category/tag”. This is a good step in the right direction and we can follow up with a much more complex change if it’s required in the future.
Thanks again @RGJ!