Fix bug in NativeMethods implementation

[shimat]

This pull request updates the platform detection logic in the IsWasm() method to improve compatibility with newer .NET versions.

Platform detection update:

• Updated the preprocessor directive in the IsWasm() method of NativeMethods.cs from #if NET6_0 to #if NET5_0_OR_GREATER, ensuring that the WebAssembly architecture check works correctly on .NET 5.0 and later versions.

Summary by CodeRabbit

• Refactor
  • Adjusted conditional compilation targets in platform detection logic to expand support for additional .NET target frameworks, including improved WebAssembly architecture detection.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: 4d4356e7-e160-4042-b24b-ae3e12746a0b

📥 Commits

Reviewing files that changed from the base of the PR and between 6e4c249 and 007639f.

📒 Files selected for processing (1)

• src/OpenCvSharp/Internal/PInvoke/NativeMethods/NativeMethods.cs

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📝 Walkthrough

Walkthrough

This PR adjusts conditional compilation directives and formatting in the NativeMethods.cs file. The primary semantic change widens the version condition in IsWasm() from NET6_0 to NET5_0_OR_GREATER, allowing earlier .NET versions to execute the Wasm architecture check. Remaining changes involve indentation adjustments across multiple methods.

Changes

Cohort / File(s)	Summary
Conditional Compilation & Formatting src/OpenCvSharp/Internal/PInvoke/NativeMethods/NativeMethods.cs	Updated indentation in StringUnmanagedTypeNotWindows and IsUnix() methods; widened IsWasm() version condition from #if NET6_0 to #if NET5_0_OR_GREATER, allowing NET5_0 and above to evaluate Wasm architecture check instead of returning false.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

🚥 Pre-merge checks | ✅ 2 | ❌ 1

❌ Failed checks (1 inconclusive)

Check name	Status	Explanation	Resolution
Title check	❓ Inconclusive	The title 'Fix bug in NativeMethods implementation' is vague and does not clearly convey the specific nature of the change - expanding WASM detection to .NET 5.0+.	Consider a more specific title like 'Expand WASM platform detection to .NET 5.0+' to clearly communicate the main change in the changeset.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%.

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✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix_NativeMethods_bug

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