Add PDFDocument and SVGDocument classes for native PDF/SVG output on GTK#17

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Copilot wants to merge 11 commits intomasterfrom

copilot/add-pdf-svg-output-support

Commits on Nov 29, 2025

Initial plan
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Initial analysis of GC and Drawable architecture

Copilot
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laeubi
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Add PDFDocument and SVGDocument classes with native Cairo bindings

Copilot
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laeubi
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Add tests for PDFDocument and SVGDocument

Copilot
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laeubi
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Remove binary artifacts and update .gitignore

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laeubi
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Address code review feedback: replace reflection with direct Display access

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laeubi
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Add PDFDocument and SVGDocument classes for macOS (Cocoa)

Copilot
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laeubi
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Fix code review issues: extract helper method and fix isDisposed

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laeubi
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Add PDFDocument and SVGDocument classes for Windows

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laeubi
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Fix code review issues: remove duplicate lines, use specific exception, add null check

Copilot
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laeubi
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Remove SVGDocument - only PDF is fully supported on all platforms

Copilot
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laeubi
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