Fix registry 404 and docs preview rendering

[manthansubhash01]

Fix legacy registry 404 and docs preview reliability

Summary

This PR fixes a docs/registry regression in the v4 app where legacy registry style URLs returned 404 for some components (notably combobox), and docs previews could appear blank for lazy-loaded examples.

Problem

• Legacy registry URL requests like /r/styles/new-york/combobox.json failed.
• Radix combobox docs referenced a mismatched style key.
• Lazy demo previews in docs did not always render reliably.

Root Cause

• Registry JSON for impacted components exists under new-york-v4, but some consumers still request new-york (or default).
• The combobox docs page referenced base-nova instead of radix-nova.
• Preview tabs rendered lazy content without a suspense boundary.

What Changed

1) Backward-compatible registry rewrites

Updated Next.js rewrites to map legacy style paths to canonical v4 style paths:

• /r/styles/new-york/:path* -> /r/styles/new-york-v4/:path*
• /r/styles/default/:path* -> /r/styles/new-york-v4/:path*

File changed:

• apps/v4/next.config.mjs

2) Corrected combobox docs style references

Replaced combobox docs style references with the correct radix style key.

File changed:

• apps/v4/content/docs/components/radix/combobox.mdx

3) Improved preview rendering resilience

Wrapped preview component rendering in React.Suspense (with fallback) for both LTR and RTL branches.

File changed:

• apps/v4/components/component-preview-tabs.tsx

Impact

• Legacy registry URLs now resolve to existing canonical assets.
• Combobox docs examples and source sections point to correct style assets.
• Docs example previews are more reliable for lazy-loaded examples.

Validation

• Confirmed canonical registry artifacts exist for affected components:
  • public/r/styles/new-york-v4/combobox.json
  • public/r/styles/new-york-v4/popover.json
  • public/r/styles/new-york-v4/tooltip.json
• Confirmed docs style references in combobox page now use radix-nova.
• Confirmed suspense wrappers exist in preview tabs for both render branches.

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