Add compact desktop UI foundations

[brxs]

Summary

• release @protocol-works/design-tokens@0.2.0 with shared compact/default control sizing tokens and Tailwind aliases
• release @protocol-works/ui@0.3.0 with size="sm" support across buttons and form controls plus a labelled square IconButton
• replace hand-rolled modal and popover behavior with Radix Dialog/Popover primitives while preserving the established [protocol]works presentation
• improve Field and Checkbox accessible description/error wiring
• add interaction tests for focus, Escape dismissal, busy modal behavior, accessible names, and compact Tailwind output

Why

Rabbithole needs dense desktop controls without creating local variants of shared primitives. The existing shared overlays also implemented focus, portals, positioning, and dismissal behavior by hand, making them harder to reuse safely across Rabbithole and the website.

This establishes the reusable foundation before migrating either consumer, while leaving domain-specific instrument controls in Rabbithole.

Consumer impact

• controls remain md by default; compact surfaces opt into size="sm"
• Popover now uses the Radix compound API (Popover, PopoverTrigger, PopoverContent)
• Modal retains its controlled API and adds busy-state dismissal guards, initial focus, backdrop control, and presentation slots
• UI 0.3 requires design-tokens 0.2 or newer

Publish order

1. @protocol-works/design-tokens@0.2.0
2. @protocol-works/ui@0.3.0

Verification

• npm ci
• npm run check
• npm pack --dry-run
• npm pack --dry-run --workspace @protocol-works/ui