Enhance UI Search Functionality in Navbar

[jimdouk]

Description

This pull request addresses the open issue regarding the "Search Functionality on Navbar". Collaborating with @foivospro, we've implemented several improvements to enhance the user experience:

• Improved Search Bar Behavior:
  Implemented an if statement to prevent displaying results when the search bar is empty, ensuring a cleaner UI.

• Enhanced Result Display:
  Removed unnecessary padding from the search results, providing a more streamlined appearance.

• Standardized Search Bar Width:
  Set a standard width for the search bar, ensuring consistent sizing across different devices and screen resolutions.

Please provide a summary of the changes, including relevant motivation and context.

Closes #1076

Checklist:

• [x ] I have read the Contribution Guidelines
• [x ] I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• [x ] My changes generate no new warnings

Contributor License Agreement

By submitting this pull request, I acknowledge and agree that my contributions will be included in Stirling-PDF and that they can be relicensed in the future under the MPL 2.0 (Mozilla Public License Version 2.0) license.

(This does not change the general open-source nature of Stirling-PDF, simply moving from one license to another license)