Fix Missing HandleAsync() Codefix When sealed

[viceroypenguin]

Fixes #251

[codecov]

Codecov Report

❌ Patch coverage is 0% with 42 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
...CodeFixes/HandlerMethodMustExistCodeFixProvider.cs	0.00%	42 Missing ⚠️

Files with missing lines	Coverage Δ
...CodeFixes/HandlerMethodMustExistCodeFixProvider.cs	0.00% <0.00%> (ø)

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[Copilot]

Pull Request Overview

This PR enhances the HandlerMethodMustExistCodeFixProvider to generate more accurate HandleAsync methods by detecting the response type and adjusting method signatures based on class modifiers.

Key changes:

• Code fix now detects Response records and uses them as the return type instead of always defaulting to int
• Method modifiers are conditionally generated based on whether the handler class is static
• Parameter names are generated using camelCase conversion of the request type instead of always using _

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
HandlerMethodMustExistCodeFixProvider.cs	Enhanced to detect Response type, conditionally add static modifier, and generate camelCase parameter names from request types
HandlerMethodMustExistCodeFixProviderTests.cs	Renamed existing test and added new test case for sealed class scenario to validate Response type detection
Tests.HandleMethodIsCorrectWithIntReturn.cs	Updated expected diagnostic marker to reflect corrected analyzer behavior

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