feat: nav item dropdown animation implemented

[Recxsmacx]

fixes #25956

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Summary by cubic

Added smooth expand/collapse animations to navigation dropdowns on desktop and mobile, improving the menu experience. Tablet behavior now toggles tooltips instead of expanding, for more consistent interactions.

• New Features
  • Implemented grid-based transitions (grid-rows + opacity) with an overflow-hidden wrapper for child menus.
  • Applied the same animation to MobileNavigationMoreItem.
  • Updated click logic: tablets toggle tooltip; other devices toggle expansion.
  • Improved accessibility with aria-hidden and inert on collapsed content.

^{Written for commit 50693b5. Summary will update on new commits.}

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[cubic-dev-ai]

No issues found across 1 file

[Recxsmacx]

@dhairyashiil need your check on this>