fix(sidebar): prevent overflow in SidebarSeparator with horizontal orientation

[edouard-andrei]

Summary

Fixed overflow issue in SidebarSeparator component by updating the width class to use data-[orientation=horizontal]:w-auto instead of w-auto. This makes the width override more specific, only applying to horizontal separators, which prevents conflicts with other Separator styling.

Fixes #1486

Changes

• Updated SidebarSeparator.vue in all styles (default, new-york, new-york-v4)
• Changed w-auto to data-[orientation=horizontal]:w-auto to prevent overflow issues
• Rebuilt the registry to include the component changes

Related

This fix is related to https://github.com/shadcn-ui/ui/pull/8498 which addresses the same issue in the main shadcn-ui/ui library.

Test plan

• [x] Built the registry successfully
• [x] Verified changes in all three style variants
• [x] Follows conventional commit guidelines