feat(search): add export search results to CSV functionality

[hexwarrior6]

Description
This pull request introduces a new feature that allows users to export their search results to a CSV (Comma-Separated Values) file. This enhances data portability and enables users to perform further analysis on their search data using external tools like Excel or Google Sheets.

Changes Proposed

• Added a new "Export to CSV" button to the search results toolbar.
• Implemented the exportToCSV utility function that converts the search results data into a properly formatted CSV string.
• Added error handling for the export process (e.g., empty results, download cancellation).
• Added unit tests for the new exportToCSV function to ensure data is correctly formatted.

Technical Details

• The CSV generation handles special characters (like commas and quotes within data) by wrapping fields in quotes.
• The function uses the Blob and URL.createObjectURL Web APIs to trigger the file download in the browser.

[vercel]

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