fix: strip trailing whitespace in code blocks

[NagariaHussain]

[coderabbitai]

Caution

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Pull request was closed or merged during review

Walkthrough

This change modifies code block rendering across both frontend and backend layers. The JavaScript enhancement adds preprocessing to replace trailing whitespace in the final text node of code blocks with a newline. Simultaneously, the Python markdown renderer adds a block_code method override that strips trailing whitespace from code content and appends a newline before rendering. A corresponding test case validates that code blocks with trailing spaces on the closing fence are properly normalized.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title 'fix: strip trailing whitespace in code blocks' is concise, clear, and directly summarizes the main change—removing trailing whitespace from code blocks across both backend and frontend logic.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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