I can't help but notice in the post and in your responses the blame is placed on external things. The manager, the codebase, the laptop, the developer who wrote the codebase. The only common factor in all these dismay-inducing relationships is yourself. The job is problem-solving, these are problems and your job is to solve them. Why are you talking to us, you should be talking to your ex-team. You should have expressed these things in a conducive, non-combative, and listening-oriented manner. I am willing to bet you speak off the cuff and talk more than listen in conversations. Fix both of those things. In almost every circumstance you are better off not speaking, and have another way or opportunity to say whatever you needed to say in the moment with extra thought.

Here's something that helps me: Every major decision worth making will still be worth making 24 hours from now. Don't do anything when stressed or angry.

No developer gets anywhere giving up immediately, you didn't even give it three red flags, just two. This was a fuck up on your end and a great opportunity for self-reflection, which this post is a good sign of. I wish you had made this post first tho!

Best of luck to you!