fix: aligned search input with vocab

[Queen-codes]

Fixes

• Fixes [Feature]Header and Input Styling Not Aligning with vocabulary #322 by @Queen-codes

Description

this pr expands the search input to be larger, and aligns it visually with the input in search-index context in vocab.

Screenshots

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  visible errors.

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[possumbilities]

@Queen-codes I actually like it on its own line. I think the input box could use a little more space above it? Otherwise I like this direction!