Just use any of the PKM tools, like Logseq or Obsidian. You can customize the UI to your hearts content, and both have plugins that take your API key and let you experiment with prompts. There are a few VSCode plugins as well. I use VSCode and Logseq as well. In Logseq, your blocks sent to the API are appended with a nested block, so it's very nice and tidy and customizable with css as needed.
Just use any of the PKM tools, like Logseq or Obsidian. You can customize the UI to your hearts content, and both have plugins that take your API key and let you experiment with prompts. There are a few VSCode plugins as well. I use VSCode and Logseq as well. In Logseq, your blocks sent to the API are appended with a nested block, so it's very nice and tidy and customizable with css as needed.