Improve Markdown PDF visual rendering

[PrzemyslawKlys]

Summary

• route Markdown PDF visual fences through MarkdownReader semantic AST extensions instead of PDF-side code-block interpretation
• add native OfficeIMO chart rendering for semantic chart fences and styled fallback warnings for unsupported visual fences
• improve Markdown image output with themed figure styles, captions, placeholders, image-only paragraphs, and chart/figure visual tests

Validation

• dotnet test .\OfficeIMO.Tests\OfficeIMO.Tests.csproj -f net8.0 --filter "FullyQualifiedName~MarkdownSaveAsPdfVisualTests" -v:minimal
• dotnet build .\OfficeIMO.Markdown.Pdf\OfficeIMO.Markdown.Pdf.csproj -v:minimal

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[codecov]

Codecov Report

❌ Patch coverage is 74.57490% with 628 lines in your changes missing coverage. Please review.
✅ Project coverage is 73.55%. Comparing base (8ac832c) to head (61d22d7).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
...kdown.Pdf/MarkdownPdfConverterExtensions.Charts.cs	79.94%	79 Missing and 71 partials ⚠️
OfficeIMO.Markdown/Options/MarkdownVisualTheme.cs	42.13%	96 Missing and 7 partials ⚠️
....Pdf/MarkdownPdfConverterExtensions.ChartSeries.cs	69.77%	60 Missing and 34 partials ⚠️
OfficeIMO.Markdown.Pdf/MarkdownPdfJson.cs	59.40%	62 Missing and 20 partials ⚠️
.../MarkdownPdfConverterExtensions.ChartValidation.cs	76.47%	15 Missing and 13 partials ⚠️
...MO.Markdown.Pdf/MarkdownPdfVisualTheme.Markdown.cs	78.44%	9 Missing and 16 partials ⚠️
OfficeIMO.Markdown/Options/MarkdownColor.cs	86.66%	12 Missing and 6 partials ⚠️
OfficeIMO.Markdown.Pdf/MarkdownPdfFigureStyle.cs	77.63%	9 Missing and 8 partials ⚠️
OfficeIMO.Markdown/Utilities/HtmlRenderer.cs	75.00%	3 Missing and 14 partials ⚠️
...n/Converters/MarkdownToWordConverter.Formatting.cs	82.47%	11 Missing and 6 partials ⚠️
... and 15 more

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1984      +/-   ##
==========================================
+ Coverage   73.52%   73.55%   +0.02%     
==========================================
  Files        2559     2571      +12     
  Lines      292953   295421    +2468     
  Branches    63248    63917     +669     
==========================================
+ Hits       215386   217285    +1899     
- Misses      48890    49210     +320     
- Partials    28677    28926     +249     

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OfficeIMO/OfficeIMO.Markdown.Pdf/MarkdownPdfConverterExtensions.Blocks.cs

Line 96 in c120473

AppendInlines(builder, heading.Inlines, CreateInlineStyle(visualTheme).With(bold: true, fontSize: fontSize));

Apply shared heading color to H4+ PDFs

When MarkdownPdfSaveOptions.Theme customizes Palette.Heading, H1–H3 go through the PDF heading theme, but H4 and deeper headings are rendered as plain paragraphs with only bold/font size applied. Those lower-level headings inherit body/default text color instead of the shared heading color, so documents with H4+ headings are only partially themed; pass the heading color into this inline style or use themed heading styles for all levels.

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