chore(ui): design-sync inputs for the shadcn kit

[Zach Dunn (zachdunn)]

Repo-side inputs for re-syncing the Claude Design project to the new shadcn/Base UI kit (18 components):

• src/design-sync.ts barrel + tsup entry — /design-sync bundles the whole kit; dist/index.js still carries only the transitional legacy exports and stays the public types entry.
• Static Tailwind compile of theme.css → dist/design-theme.css (@tailwindcss/cli devDep) as the sync's shipped stylesheet (tokens + font-face + the utility set used across packages/ui and apps/web).
• .design-sync/: config repointed at the kit (componentSrcMap pins, subcomponent exclusions), 18 authored kit previews replacing the retired legacy set, shared dark-canvas canvas.module.css, conventions.md rewritten for the Tailwind/Base UI idiom, NOTES updated with the new pipeline facts.
• pnpm-workspace: deny @parcel/watcher postinstall (watch-mode-only dep of the Tailwind CLI).

The sync itself already ran: all 18 previews render-checked and graded; project updated in place. pnpm --filter @uploads/ui build remains green.

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