feat(registry): add @niko-table to the registry directory

[Semkoo]

Adds Niko Table to apps/v4/registry/directory.json.

Niko Table is an open-code registry of composable data-table and editable data-grid components built on TanStack Table and shadcn/ui: faceted and advanced filters, sorting, row/column drag-and-drop, virtualization, column resizing and width persistence, server-side pagination, and a spreadsheet-style grid — all installed à la carte.

{
  "name": "@niko-table",
  "homepage": "https://niko-table.com",
  "url": "https://niko-table.com/r/{name}.json",
  "description": "Composable, open-code data tables and an editable data grid built on TanStack Table: …"
}

Criteria

• Open source and publicly accessible — Semkoo/niko-table-registry, MIT, and the registry is served publicly at https://niko-table.com/r/{name}.json.
• Valid registry schema — the index at /r/registry.json declares $schema: https://ui.shadcn.com/schema/registry.json and is generated by shadcn build; all 31 items resolve.
• Flat registry — /r/registry.json and /r/{item}.json sit at the root of the registry; no nested items.
• No embedded content in the index — index item files entries carry only path and type.

Verification

• npx shadcn@latest search @niko-table → returns all 31 items with titles and descriptions.
• npx shadcn@latest add @niko-table/data-table (and every other item) installs into a fresh Next.js app and typechecks cleanly under both the Radix (new-york) and Base UI (base-nova) styles.
• The appended entry validates against directoryEntrySchema in apps/v4/scripts/validate-registries.mts (name regex, homepage URL, url contains {name}, description, logo).
• The logo is an inline SVG using stroke='var(--foreground)' so it adapts to light/dark like the surrounding entries.

The diff is a single appended entry; the existing 238 entries are byte-for-byte unchanged.

[vercel]

@Semkoo is attempting to deploy a commit to the shadcn-pro Team on Vercel.

A member of the Team first needs to authorize it.

[github-actions]

Can you sign the commits please? See https://docs.github.com/en/authentication/managing-commit-signature-verification/signing-commits. Thank you.

[shadcn]

Thanks, added this to #11861. Closing this one so we can track it there.