fix: responsive SVG root (viewBox, scales to viewport)#45
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…g browsers The tracer emits a fixed pixel width/height and NO viewBox, so opening the output in a browser rendered it at raw pixel size (e.g. 2048x2048) and overflowed/scrolled. _build_svg now emits a viewBox (derived from the source dimensions when absent), drops the fixed px width/height, and sets style=width:100%/height:100% + preserveAspectRatio=xMidYMid meet, so the SVG scales to any container/viewport with aspect preserved — like professional vectorizer output. Tests updated for the new responsive root. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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Output SVGs had a fixed pixel width/height and no viewBox → browsers rendered at raw size and overflowed/scrolled. Now emits a viewBox + width/height:100% + preserveAspectRatio, so it scales to any container with aspect preserved. Tests updated.
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