docs: add JSDoc header to word-search.jsx (#228)

## Description
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[adds/removes/fixes/replaces] the [feature/bug/etc] -->

This PR adds documentation to Recent Searches Component

## Related Issue
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#123 or Resolves #123 -->

Fixes #215

## Screenshots/Screencasts
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changes (especially if it's a visual change) -->

N/A

## Notes to Reviewer
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Author: tharun634

src/components/islands/recent-searches.jsx

@@ -1,3 +1,7 @@
+/**
+ * Recent Searches Component - User Search History Display
+ * @exports RecentSearches - Displays user's recent search history from localStorage with links to previously searched terms
+ */
 import { useEffect } from "react";
 import { useStore } from "@nanostores/react";
 import { $recentSearches } from "../../lib/stores/search.js";