docs(fuselage): add visual states documentation to SearchInput

[Kalpana-chavhan]

Proposed changes

Added explicit documentation for the States story in the SearchInput component. The new documentation explains the visual variations for hover, active, focus, disabled, and errored states across both standard and small sizes. It also clarifies the purpose of the X/Y axes in the PropsVariationSection grid. ( I am fully aware that there is a dedicated page for rocket.chat documentations, this is just a suggested issue fix that can later be implemented elsewhere, if possible and valid).

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Issue(s)

Closes #1826

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Testing Plan

• Run Storybook locally
• Navigate to Inputs/SearchInput.
• Open the Docs tab.

Verify that the "Visual States and Interaction Documentation" section appears above the States story and that the markdown renders correctly.

[changeset-bot]

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Latest commit: aa11152

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