Add className prop documentation for MDX components

[mintlify]

Summary

• Add className prop documentation to Accordion, AccordionGroup, Card, Color, Column, Expandable, Step, Steps, Tab, Tooltip, and all callout variants (Note, Warning, Info, Tip, Check, Danger, Callout)
• Updated across all four language versions (EN, ZH, FR, ES)
• Updated callout descriptions to note that typed callouts now accept className in addition to children

Related: mintlify/mint#6736

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Note

Low Risk
Low risk documentation-only changes that don’t affect runtime behavior. Main risk is minor inconsistencies across translations or docs formatting.

Overview
Adds className to the documented props for several MDX UI components (e.g., Accordion, Card, Color, Columns/Column, Expandable, Steps/Step, Tab, Tooltip).

Updates the callout docs to explicitly state that all callout variants (typed callouts and generic Callout) accept className for custom styling, and mirrors these documentation updates in EN/ES/FR/ZH pages.

^{Written by Cursor Bugbot for commit 16a27db. This will update automatically on new commits. Configure here.}