fix: update mermaid component

[pqoqubbw]

ENG-5664: Update mermaid component to support new props

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Note

Introduces optional props to control interactive controls and their position while preserving defaults.

• Adds actions prop to Mermaid to explicitly show/hide controls; keeps auto-show via ResizeObserver when actions is undefined (threshold 120px)
• Adds placement prop (top-left, top-right, bottom-left, bottom-right) and threads it to ZoomControls for positional classes; default remains bottom-right
• Exports MermaidPlacement type; passes placement to ZoomControls
• Updates Storybook: new ActionsHidden, ActionsVisible, and Placement stories; enhances LargeDiagram with placement and docs descriptions

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[linear]

ENG-5664 Update mermaid component to support new props

https://github.com/mintlify/mint/pull/5551

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Cursor Bugbot has reviewed your changes and found 1 potential issue.

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