Refactor urlIsActive function to improve URL matching logic

[ChanDarong]

This pull request updates the logic for checking if a URL is active in the urlIsActive utility function to provide more accurate matching, especially for root and subpath URLs.

Navigation logic improvements:

• Updated the urlIsActive function in resources/js/lib/utils.ts to ensure that the root path '/' only matches itself, and that non-root paths match if the current URL starts with the checked URL. This provides more intuitive active link highlighting for navigation.
• Usefull for the nav bar, because we want to keep the nav bar active in many route in a CRUD, example /admin/users, /admin/users/create, /admin/users/1/edit, etc.

[joetannenbaum]

I get your reasoning, but I think sometimes you wan to know if that exact URL is active, which is what this currently does. I don't mind adding a flag param to this helper to match exact or subpaths (or perhaps even making an additional helper for the subpath checking).