Support selecting component package files

[samuel-williams-shopify]

Add a reusable utopia:components:update task for installing browser components from production JavaScript packages.

Projects can select files from a package through package.json:

{
  "utopia": {
    "components": {
      "mermaid": {
        "include": [
          "mermaid.esm.min.mjs",
          "chunks/mermaid.esm.min/**/*.mjs"
        ]
      }
    }
  }
}

Patterns are relative to the package dist directory when present, or otherwise its package root. Unconfigured packages retain the existing copy-all behavior. Include rules are validated before the existing installation is removed, and stale files are removed during successful updates.

This replaces the old utopia:node:update task. The JavaScript integration guide and generated documentation context now use utopia:components:update.

Validation:

• 371 tests pass (907 assertions)
• RuboCop reports no offenses
• Documentation coverage is complete (485/485 definitions)
• Added coverage for selected files, stale cleanup, unmatched patterns, and scoped packages