fix(parser): allow map shorthand after open expressions

[Seddryck]

Summary

• allow map shorthand nodes to follow operations in open-expression pipelines
• preserve the authored |> form and existing map_shorthand CST shape
• add grammar and typed C# regression coverage for filter(even) |> add(1)

Validation

• npx tree-sitter test --file-name map-shorthand.txt (10 passed)
• dotnet test bindings/csharp/Expressif.Syntax.Tests/Expressif.Syntax.Tests.csproj --framework net8.0 --no-restore --nologo -m:1 (174 passed)

Close #107

[coderabbitai]

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