fix(packages/components/src): MDX indentation

[code-qtzl]

Issue: #226

Summary

When CodeBlock is used inside MDX/JSX with template literals, the code content inherits the surrounding JSX indentation, causing it to render with extra leading whitespace. This fix adds a dedentCode utility that detects the minimum indentation across all non-empty lines (after the first) and strips it uniformly, so the rendered code aligns correctly regardless of nesting depth.

Two Storybook stories (MDXIndents, MDXIndentsDeeplyNested) are added to cover typical and deeply-nested JSX indentation scenarios.

MDXIndents

MDXIndentsDeeplyNested

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Note

Medium Risk
Changes how CodeBlock/CodeGroup derive the raw code string (used for rendering and copy), which could unintentionally alter leading whitespace in some code samples beyond the MDX template-literal cases.

Overview
Fixes extra leading whitespace when CodeBlock content is provided via indented MDX/JSX template literals by adding a dedentCode step to getCodeString.

Updates CodeBlock and CodeGroup to use getCodeString (instead of getNodeText) for copy-to-clipboard text extraction, and adds two Storybook stories (MDXIndents, MDXIndentsDeeplyNested) to cover nested indentation scenarios.

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