P3.24 — @property on token leaves + styles.property

[dbanksdesign]

Summary

• Add opt-in { value, syntax, inherits? } leaf shape to tokens.create — descriptor leaves register @property, emit :root defaults, and return { name, var, toString } refs instead of plain var(...) strings.
• Add styles.property(id, options?) for standalone registered custom properties (scoped under {scopeId}-property-{id}).
• Extract shared @property registration into registered-property.ts; ComponentInternalVarRef now includes toString() coercion.

Test plan

• npm test in packages/typestyles (347 tests)
• npm run build passes (bundle budget bumped ~764 bytes for new API surface)
• Verify typed token leaves work in a component variant override: [ref.name]: value
• Verify styles.property with syntax + value animates/transitions as expected in a browser

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