Add empty state for search results

[priyadharshan7119]

Description

Adds an empty state when search or filter results contain no matches.

Changes

• Added an empty state to the repository results view.
• Added an empty state to the organization results view.
• Displays a clear message when no results are found.
• Preserved the existing search, filtering, and infinite scroll behavior.

Testing

• Tested the empty state on the Individuals page.
• Tested the empty state on the Teams page.
• Verified that normal results still appear after clearing the search/filter.
• ESLint passes successfully.

Fixes #550