Add WeBase navigation primitives

[xuewill]

What changed

• add semantic WeBaseLink and WeBaseTag components
• export their inferred Props types from the package root
• document and render both primitives in the public docs app
• release @webaseui/svelte 0.3.0 for the xue page migration

Validation

• npm run check
• npm run check:consumer
• npm audit --audit-level=high