Change jobs, probably? A toxic environment like this will not make you happy, and you can't easily fire your boss. The good news is that if you're working in IT, you probably have the luxury of being able to go somewhere else with relative ease.
On that topic, I'm a huge believer in a degree of financial independence, a rainy-day fund [1]. When you don't have to worry about having money for next month's rent, it really changes your outlook on things and makes it easier to make decisions that are just or right for you, without stressing over every possible misstep. And it's pretty easy to build such a fund [2].
Hope they actually steal it and implement it properly rather than completely butcher it so badly that you wouldn't want anyone to hear that this was supposedly your idea.
Erm, no. Speaking as someone who was raised on ideas like this.
This is convenient for others, but not for you. They will take advantage of you if you think like that and you not be seen as leadership material.
Either challenge it, leave or find a way to prevent that next time. If you truly have no choice but to put up, then you have no choice. But don't be naive doormat.
It depends on your professional goals. If your goal is to be esteemed by your peers then you are correct.
If your goal is to see how much good stuff you can coerce into existence for the company then it doesn’t matter who does the work, who takes credit, or even whether anyone realizes anything happened. All that matters for you to hit that goal is the stuff getting done.
Tolerating ideas stealing (and other sorts of toxicity) is not good for company either through. Because what will happen is that people who steal ideas will go up and others will grow resentful or will stop sharing ideas. Not reacting to things like that enables it and makes it more frequent. If you want to be leader, you have to be conscious of shaping culture and this is part of it.
Also, leader needs to be able to protect team or company from under-the-belt attempts of customers, suppliers, competitors and such. Some of them will try that for sure and it is leaders job to deal with it.
On that topic, I'm a huge believer in a degree of financial independence, a rainy-day fund [1]. When you don't have to worry about having money for next month's rent, it really changes your outlook on things and makes it easier to make decisions that are just or right for you, without stressing over every possible misstep. And it's pretty easy to build such a fund [2].
[1] https://www.thebillfold.com/2016/01/a-story-of-a-fuck-off-fu...
[2] http://lcamtuf.coredump.cx/prep/#3.1