docs: refresh README for pnpm global virtual store support

[Copilot]

The README was still describing pnpm path normalization as if only local .pnpm/... layouts were supported. This updates the docs to reflect current behavior with enableGlobalVirtualStore.

• README updates

  • Clarify that pnpm path serialization also supports global virtual store layouts
  • Mention both pnpm config forms:
    • enableGlobalVirtualStore
    • enable-global-virtual-store=true in .npmrc

• Behavior documented

  • Expand the replacePnpmInner feature description to cover both:
    • local virtual store paths: .pnpm/...
    • global virtual store paths: pnpm/store/.../links/...

• Example refreshed

  • Add a concrete global virtual store path example and its normalized output

<ROOT>/node_modules/../../../../../../Library/pnpm/store/v10/links/react/19.2.4/<hash>/node_modules/react/index.js

becomes:

<PNPM_INNER>/react/index.js

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[Copilot]

Pull request overview

Documentation-only update to reflect that replacePnpmInner also handles pnpm global virtual store paths (enableGlobalVirtualStore), and corrects the example output to show the prefix-stripped <PNPM_INNER> format.

Changes:

• Added mention of enableGlobalVirtualStore support in the feature list
• Fixed the example output to show <PNPM_INNER>/css-loader/utils.ts (without <ROOT>/node_modules/ prefix), matching actual behavior
• Updated the replacePnpmInner feature table description to cover global virtual store paths

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