[bug]: Directory mobile View button does not open registry link #10899

Describe the bug

On the registry directory page, the mobile-only View button for each registry does not open the registry homepage. Tapping the button has no visible effect.

The desktop layout works because the registry name is rendered as an external link. On mobile, the footer renders a View button, but that button is not wired to a link or click handler.

Affected component/components

Registry Directory (/docs/directory)

How to reproduce

1. Open https://ui.shadcn.com/docs/directory
2. Switch to a mobile viewport, for example 320px wide
3. Tap the View button on any registry item
4. Notice that the page does not navigate and no external registry link opens

Expected behavior

The mobile View button should open the same registry homepage URL as the registry title link, including the directory referral query params.

Root cause

In apps/v4/components/directory-list.tsx, the mobile footer renders View as a plain Button with no href or click handler.

System Info

Reproduced with mobile viewport 320x526 in Chromium-based browser automation.
Also reported on multiple physical mobile devices.

Before submitting

• I've made research efforts and searched the documentation
• I've searched for existing issues