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objdetect: default CCheckerDetector chart type to MCC24 - #30412 Fixes #30410. `CCheckerDetectorImpl::m_chartType` had no initializer and the constructor is empty, so a detector from `CCheckerDetector::create()` read an indeterminate chart type unless `setColorChartType()` was called first. It now defaults to `MCC24`, the first `ColorChart` value. With `operator new` filling memory with 0xFF, 5.x reports chart type -1 and `process()` fails on `mcc/MCC24.png`; with the fix it reports `MCC24` and finds the chart. Added `CV_mccRunCCheckerDetectorBasic.default_chart_type`, which checks the default and runs detection without setting the type. ### Pull Request Readiness Checklist See details at https://github.com/opencv/opencv/wiki/How_to_contribute#making-a-good-pull-request - [x] I agree to contribute to the project under Apache 2 License. - [x] To the best of my knowledge, the proposed patch is not based on a code under GPL or another license that is incompatible with OpenCV - [x] The PR is proposed to the proper branch - [x] There is a reference to the original bug report and related work - [x] There is accuracy test, performance test and test data in opencv_extra repository, if applicable Patch to opencv_extra has the same branch name. - [ ] The feature is well documented and sample code can be built with the project CMake