Indented code block is not working properly

[ypyl]

Hello, thank you for the great library!

Not sure how to properly set up library to correctly identifier code blocks like (where code is indented)

### Sample Code Review

1. **Variable Naming:**
   - **Observation:** The variable `total` is used to store the sum of the prices and their tax. While it is functional, the name could be more descriptive.
   - **Suggestion:** Consider renaming `total` to `total_price` to make the variable name more explicit and aligned with its purpose.

   **Updated Code:**
   ```python
   total_price = 0

Is there any particular reason why findCompleteCodeBlock and codeBlockLookBack contain regex that ignores spaces before ```? e.g. would it be useful to modify findCompleteCodeBlock to have

const regex = new RegExp(
    `${startEndGroup}.*\n([\\s\\S]*?)\n\\s*${startEndGroup}`,
  );

and codeBlockLookBack

export const parseCompleteMarkdownCodeBlock: ParseFunction = (
  codeBlock,
  userOptions,
) => {
  const options = getOptions(userOptions);
  const startEndGroup = getStartEndGroup(options.startEndChars);
  return parseMarkdownCodeBlock(codeBlock, startEndGroup, `\n\\s*${startEndGroup}`);
};

export const parsePartialMarkdownCodeBlock: ParseFunction = (
  codeBlock,
  userOptions,
) => {
  const options = getOptions(userOptions);
  const startGroup = getStartEndGroup(options.startEndChars);
  const endGroup = `(\n\\s*${options.startEndChars
    .map((char) => `${char}{0,2}$`)
    .join("|")}|$)`;
  return parseMarkdownCodeBlock(codeBlock, startGroup, endGroup);
};

Or am I just missing something here and it will break something else? Actually, GitHub has the same issue with indented code blocks and I am assuming there is a reason for that. Thank you

[ANAS727189]

According to the CommonMark spec, fenced code blocks can be indented up to three spaces.

Currently, llm-ui’s regex requires code fences to start at column 0, which means valid cases like this aren’t recognized:

print("hello")

3 spaces before the backticks is valid CommonMark.

A possible spec-compliant fix would be to adjust the regex in findCompleteCodeBlock and codeBlockLookBack from requiring `^``` to allowing {0,3} before the fence For example:

const regex = new RegExp(
  ` {0,3}${startEndGroup}.*\n([\\s\\S]*?)\n {0,3}${startEndGroup}`,
);

Would you be open to a PR with this change?