Fix Path2D constructor handling of webpack-bundled instances

[Copilot]

PDF.js + Webpack encounters Error: Value is none of these types 'String', 'Path' when Path instances pass through bundled code. Webpack's transformation causes napi-rs to classify Path instances as Unknown rather than &Path, triggering immediate failure.

Changes

src/path.rs

• Added Env parameter to constructor (napi-rs injected, no JS API change)
• Implemented FromNapiValue::from_napi_value fallback to extract Path from Unknown values
• Fixed error message typo

test/path-constructor.spec.ts

• Added tests verifying constructor accepts Path instances, strings, and creates independent copies

Example

// This now works correctly with webpack-bundled code
const original = new Path2D();
original.rect(0, 0, 100, 100);

const copy = new Path2D(original); // Previously failed with webpack

The fix handles the Unknown case by attempting to unwrap the Path instance before failing, maintaining full backward compatibility.

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Original prompt

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This section details on the original issue you should resolve

<issue_title>PDF.js + Webpack runs into type error: Value is non of these types String, Path</issue_title>
<issue_description>An earlier issue, #994, has been resolved as of 0.1.72. A similar issue, since that release, for all combinations of PDF.js and @napi-rs/canvas, has appeared with a similar type error:

Error: Value is non of these types `String`, `Path`, 
    at CanvasGraphics.consumePath (/Users/cybourgeoisie/Documents/Cybourgeoisie/webpack-pdfjs-napirscanvas-test/dist/626.main.js:16611:15)
    at CanvasGraphics.endPath (/Users/cybourgeoisie/Documents/Cybourgeoisie/webpack-pdfjs-napirscanvas-test/dist/626.main.js:15634:10)
    at CanvasGraphics.constructPath (/Users/cybourgeoisie/Documents/Cybourgeoisie/webpack-pdfjs-napirscanvas-test/dist/626.main.js:15543:13)
    at CanvasGraphics.executeOperatorList (/Users/cybourgeoisie/Documents/Cybourgeoisie/webpack-pdfjs-napirscanvas-test/dist/626.main.js:15104:23)
    at InternalRenderTask._next (/Users/cybourgeoisie/Documents/Cybourgeoisie/webpack-pdfjs-napirscanvas-test/dist/626.main.js:20642:37)
    at process.processTicksAndRejections (node:internal/process/task_queues:95:5) {
  code: 'InvalidArg'
}

Similar to the previous issue, this issue does not show up when running in dev, but it does show up in the built code with webpack.

I have updated the test repo with the current versions for reproduction: https://github.com/Cybourgeoisie/webpack-pdfjs-napirscanvas-test</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes PDF.js + Webpack runs into type error: Value is non of these types String, Path #1126

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