feat(diagnostics): complete syntax diagnostic lifecycle

[Seddryck]

Summary

• map parser byte spans to precise zero-based LSP UTF-16 ranges across multiline and Unicode input
• turn zero-width or out-of-bounds parser spans into deterministic, useful minimal squiggles
• cover diagnostic publication, replacement after edits, and clearing on document close
• preserve the parser-derived diagnostic details and document version

Validation

• dotnet build src/Expressif.LanguageServer/Expressif.LanguageServer.csproj --configuration Release --framework net10.0 --runtime win-x64 --no-restore --nologo -m:1 /nodeReuse:false
• dotnet test src/Expressif.LanguageServer.Core.Tests/Expressif.LanguageServer.Core.Tests.csproj -f net10.0 -r win-x64 --no-restore --nologo --verbosity minimal -m:1 /nodeReuse:false (11 passed)
• dotnet test src/Expressif.LanguageServer.Tests/Expressif.LanguageServer.Tests.csproj -f net10.0 -r win-x64 --no-restore --nologo --verbosity minimal -m:1 /nodeReuse:false (9 passed)

Closes #15

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📥 Commits

Reviewing files that changed from the base of the PR and between bc09ea2 and 61df3a3.

📒 Files selected for processing (3)

• src/Expressif.LanguageServer.Tests/SyntaxDiagnosticMapperTests.cs
• src/Expressif.LanguageServer.Tests/TextDocumentSyncHandlerTests.cs
• src/Expressif.LanguageServer/Diagnostics/SyntaxDiagnosticMapper.cs

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