fix: [code-block] stop adding a hidden line to maxLines

[rohanchkrabrty]

Summary

• CodeBlock stored maxLines + 1 in context and rendered one extra line behind the absolutely positioned collapse trigger. Without a CollapseTrigger, maxLines={5} showed 6 lines.
• Pass maxLines through as given. CollapseTrigger renders when the code has more than maxLines lines.
• Keep the collapsed trigger in normal flow and remove the code's bottom padding while collapsed, so the cut looks the same. The trigger also lines up when it sits outside CodeBlock.Content, as in the docs anatomy.
• Keep index keys for lines and tokens: they are position-based and stateless. Keep the 0.5px borders, which the design system uses on purpose.

Closes #606

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Project	Deployment	Actions	Updated
apsara	Ready	Preview	Oct 1, 2026 7:46am UTC

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📒 Files selected for processing (4)

• packages/raystack/components/code-block/__tests__/code-block.test.tsx
• packages/raystack/components/code-block/code-block-misc.tsx
• packages/raystack/components/code-block/code-block-root.tsx
• packages/raystack/components/code-block/code-block.module.css

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commit: 74bb524