feat: add search to HAR file viewer utility

[mansueli]

Added comprehensive content search functionality to the HAR file viewer utility, allowing users to search through URLs, headers, request payloads, and response content across all network requests.

Features Implemented

1. Search Input UI

• Added a search input field with a search icon positioned at the top of the viewer
• Includes placeholder text: "Search in URLs, headers, requests, and responses..."
• Features a clear button (X icon) that appears when there's text in the search field
• Clean, modern design that matches the existing UI

2. Debounced Search

• Implemented 300ms debounce to prevent excessive re-renders while typing
• Improves performance by waiting for user to finish typing before filtering results
• Uses React hooks for efficient state management

3. Testing

• All existing tests continue to pass
• New tests verify search functionality works correctly
• Tests verify clear button functionality
• Test coverage: 6/6 tests passing

[peckz]

@mansueli Great feature, thank you for building this!

Welcome to the contributors list!