fix: include legend and overlay in correlation PNG export#314
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The PNG export only captured the chart canvas, missing the legend (rendered as HTML) and overlay (crosshairs/pins). Build an off-screen composite canvas that layers chart + overlay + programmatic legend text read from the visible DOM items. Handles edge cases: event labels with nested badge/gear elements (extracts text nodes only), legend overflow (scales font/gap down), and DPR-aware compositing. Closes #313
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Summary
Test plan
Closes #313