[Feature Request] Paper icon system — renderless Icon component + alias resolution via createTokens

Summary

Icon system for Paper — renderless <Icon> component with alias resolution powered by createTokens. Design systems provide their icon set (UnoCSS classes, SVGs, etc.), Paper handles the plumbing.

Approach

• Alias resolution via createTokens (e.g. { close: 'i-mdi-close', menu: 'i-mdi-menu' })
• Renderless <Icon> component that resolves alias → value, design system decides rendering
• UnoCSS presetIcons handles actual icon rendering via CSS classes
• No icon set opinions at this layer — that's the design system's job

Out of Scope

• v0 level: no dedicated createIcons composable needed (createTokens covers alias mapping)
• Specific icon sets (mdi, fa, etc.) — design system chooses

Related

• v0 createTokens — foundation for alias resolution
• UnoCSS presetIcons — rendering via i-mdi-* classes
• Vuetify mdi-unocss icon set (PR #22117) — reference implementation

Start by reading the v0 createTokens foundation and the Vuetify mdi-unocss PR #22117 reference implementation. Define the renderless Icon component around alias-to-value resolution, leaving icon rendering to the design system; done means aliases resolve through createTokens without imposing an icon set.