Fix nested type inheritance conversion

[Munishwar001]

Summary

• Fixes Nested types in inheritance are not converted properly #137 — when a Java class extends/implements a nested type (e.g.
  GeneratorFactory.AbstractXmlFeatureGeneratorFactory), the declaring
  type qualifier was silently dropped, producing invalid/incorrect C#
  (AbstractXmlFeatureGeneratorFactory instead of
  GeneratorFactory.AbstractXmlFeatureGeneratorFactory).
• Root cause: TypeHelper.GetSyntaxFromType only read
  ClassOrInterfaceType.getNameAsString(), which returns just the
  simple name. JavaParser exposes the declaring type separately via
  getScope(), which was never consulted.
• Fix: after resolving the leaf type syntax, check getScope() and,
  if present, recursively resolve it and wrap the result in a
  QualifiedName, preserving Outer.Inner qualification (valid in
  both Java and C#).

Test plan

• Added ConvertNestedTypeInheritanceTests reproducing the exact
  scenario from Nested types in inheritance are not converted properly #137 (class extending/implementing nested types keeps
  the GeneratorFactory. qualifier).
• Added a sanity test confirming plain (non-nested) extends is
  unaffected.
• Full test suite passes: dotnet test — 337/337 passed.

[Copilot]

Pull request overview

Fixes conversion of Java inheritance clauses when the base type is a nested type (e.g., Outer.Inner), ensuring the declaring type qualifier is preserved in the generated C#.

Changes:

• Update TypeHelper.GetSyntaxFromType(ClassOrInterfaceType) to consult ClassOrInterfaceType.getScope() and emit a QualifiedName (Outer.Inner) when a scope is present.
• Add ConvertNestedTypeInheritanceTests to cover nested-type extends/implements and a non-nested inheritance sanity check.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
JavaToCSharp/TypeHelper.cs	Preserves nested type qualification by incorporating JavaParser scope into the emitted C# type syntax.
JavaToCSharp.Tests/ConvertNestedTypeInheritanceTests.cs	Adds regression tests validating nested-type inheritance qualification is retained and simple inheritance remains unchanged.

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