Fix navbar responsive breakpoints test

[Aamod007]

Closes #7848

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Pull request overview

Updates the navbar responsive breakpoints test to match the current Navbar component’s Tailwind breakpoint classes (lg:), aligning test expectations with the production markup (per Issue #7848).

Changes:

• Update the test description and selectors to expect lg:flex / lg:hidden instead of md:flex / md:hidden.

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