feat(paper): add PaperIcon component and createIconPlugin for alias resolution

[sridhar-3009]

Closes #107

What

Implements the Paper icon system described in #107: a renderless <PaperIcon> component backed by createTokens alias resolution, with a createIconPlugin helper for registration.

API

createIconPlugin(icons) — design system setup

import { createIconPlugin } from '@vuetify/paper'

const icons = createIconPlugin({
  close: 'i-mdi-close',
  menu:  'i-mdi-menu',
  check: 'i-mdi-check',
})

// In root component's setup():
icons.provideIcons()

<PaperIcon> — renderless component

<!-- Default: renders <span class="i-mdi-close" aria-hidden="true" /> -->
<PaperIcon icon="close" />

<!-- With label: exposes role="img" + aria-label for meaningful icons -->
<PaperIcon icon="close" label="Close dialog" />

<!-- Renderless: design system controls the element -->
<PaperIcon icon="close" renderless>
  <template #default="{ icon, attrs }">
    <span v-bind="attrs" />
  </template>
</PaperIcon>

Unregistered icon names pass through as-is (e.g. icon="i-mdi-close" works without registration).

useIconTokens() — direct token access

const tokens = useIconTokens()
const resolved = tokens.resolve('close') // 'i-mdi-close'

Architecture

• createIconPlugin calls createTokens(icons) to build a full token context with alias resolution, then uses provideIconContext (from createTokensContext) to provide it to descendants
• PaperIcon calls useIconTokens() with a try/catch so it works without a plugin (passes icon name through)
• Accessible by default: aria-hidden="true" on decorative icons; set label prop for meaningful icons

Checklist

• pnpm typecheck — clean (paper + v0 + genesis)
• pnpm test:run — 6247 tests pass
• pnpm lint:fix — clean
• pnpm repo:check — clean

[pkg-pr-new]

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commit: 0264e35

[johnleider]

Paper is currently locked down. Can revisit this later.

[sridhar-3009]

Thanks for the feedback! Closing for now since Paper is locked down — happy to reopen when the time is right.