Add TypeScript definitions for Stitcher class

[Copilot]

The Stitcher class (panorama stitching) was requested but unavailable. The stitching module is disabled in the default OpenCV.js build, but TypeScript definitions enable proper typing when users rebuild with it enabled.

Changes

• src/types/opencv/Stitcher.ts: Complete type definitions for Stitcher class

  • Core methods: create(), stitch(), estimateTransform(), composePanorama()
  • Configuration: resolution settings, confidence thresholds, wave correction
  • Constants: status codes (Stitcher_OK, etc.), modes (PANORAMA, SCANS)

• src/types/opencv/_types.ts: Added exports for Stitcher, QRCodeDetector, QRCodeDetectorAruco

• test/Stitcher.test.ts: Test suite with runtime availability checks

• README.md: Documented optional modules and rebuild instructions

Usage

// Check availability before use
if ('Stitcher' in cv) {
  const stitcher = cv.Stitcher.create(cv.Stitcher_PANORAMA);
  const status = stitcher.stitch(images, pano);
  if (status === cv.Stitcher_OK) {
    // panorama created
  }
  stitcher.delete();
}

Module availability can be verified at runtime. Users needing Stitcher must rebuild OpenCV.js with stitching module enabled per workflow in .github/workflows/build-opencv-js.yml.

Warning

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• docs.opencv.org
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Original prompt

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This section details on the original issue you should resolve

<issue_title>Stitcher Class</issue_title>
<issue_description>Any chance https://docs.opencv.org/3.4/d2/d8d/classcv_1_1Stitcher.html will be included in this library?</issue_description>

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

• Fixes Stitcher Class #24

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