Improve native Word PDF layout parity

[PrzemyslawKlys]

Summary

• improves native OfficeIMO PDF layout behavior for Word save-as-PDF scenarios, including document defaults, paragraph/list/table style defaults, headers/footers, charts, links, row/table pagination, and text diagnostics
• extracts table autofit sizing into a reusable writer component and adds Word-like handling for dense technical tables, CamelCase/header tokens, qualified identifiers, fixed-width expansion, and preserved-width tables
• refreshes PDF visual/raster baselines and expands Word SaveAsPdf/PDF visual quality coverage

Validation

• dotnet test OfficeIMO.Tests\OfficeIMO.Tests.csproj --framework net8.0 --no-restore --filter "FullyQualifiedName~Pdf" --logger "console;verbosity=minimal" -v quiet -> 3136 passed
• dotnet run --project Artifacts\WordPdfParity\StressRunner\StressRunner.csproj --configuration Release -- "C:\Support\GitHub\TestimoX-exporter-powerpoint-excel-proof\Artifacts\LiveExporterComparison\20260617-125016\TestimoX-live-10.docx" Artifacts\WordPdfParity\stress-officeimo-native-pr-final.pdf
• dotnet run --project Artifacts\WordPdfParity\CompareRunner\CompareRunner.csproj --configuration Release -- Artifacts\WordPdfParity\stress-word-saveas-reference.pdf Artifacts\WordPdfParity\stress-officeimo-native-pr-final.pdf "21-25,28-34,44-45,66-75"

Stress comparison notes

• Word Save-as reference: 69 pages; native OfficeIMO candidate: 75 pages
• links match: 35 vs 35
• images match: 0 vs 0
• remaining known gap: dense real-report table pagination still differs from Word Save-as-PDF, especially in large autofit tables where native output keeps more extracted lines per page than Word
• native conversion warnings: 0; report diagnostics: one existing Calibri ligature substitution diagnostic

[codecov]

Codecov Report

❌ Patch coverage is 80.92949% with 357 lines in your changes missing coverage. Please review.
✅ Project coverage is 73.42%. Comparing base (96a0205) to head (ac8d61e).
⚠️ Report is 14 commits behind head on master.

Files with missing lines	Patch %	Lines
...ng/Writer/PdfWriter.Layout.TableColumns.AutoFit.cs	89.07%	21 Missing and 31 partials ⚠️
...ord.Pdf/WordPdfConverterExtensions.Native.Fonts.cs	52.23%	13 Missing and 19 partials ⚠️
OfficeIMO.Pdf/Rendering/Writer/PdfWriter.Text.cs	85.34%	13 Missing and 15 partials ⚠️
...nverterExtensions.Native.ParagraphStyleDefaults.cs	68.67%	10 Missing and 16 partials ⚠️
...dfConverterExtensions.Native.TableStyleDefaults.cs	65.78%	5 Missing and 21 partials ⚠️
...rd.Pdf/WordPdfConverterExtensions.Native.Tables.cs	76.59%	5 Missing and 17 partials ⚠️
OfficeIMO.Word/Converters/DocumentTraversal.cs	81.03%	2 Missing and 20 partials ⚠️
.../Rendering/Writer/PdfWriter.Layout.TableColumns.cs	60.00%	6 Missing and 12 partials ⚠️
...dPdfConverterExtensions.Native.DocumentDefaults.cs	55.00%	5 Missing and 13 partials ⚠️
...rdPdfConverterExtensions.Native.ParagraphStyles.cs	85.56%	7 Missing and 7 partials ⚠️
... and 18 more

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1976      +/-   ##
==========================================
+ Coverage   73.36%   73.42%   +0.06%     
==========================================
  Files        2525     2531       +6     
  Lines      284422   286273    +1851     
  Branches    60940    61518     +578     
==========================================
+ Hits       208667   210202    +1535     
- Misses      47983    48097     +114     
- Partials    27772    27974     +202     

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