Add vector PDF export for polar and heatmap charts

[Copilot]

• Inspect current vector PDF export implementation and recent PR history
• Reproduce or trace the missing legend gradient in exported PDFs
• Make the smallest fix so SVG gradients survive PDF export
• Run targeted validation for the export path, then full lint/test/build
• Generate a UI screenshot for the reviewer reply
• Run final review/security validation and reply on the PR comment

[samsta]

@copilot the pdfs seem to be rastered jpegs. since the plots are SVGs, can't we create pdfs with vector graphics? otherwise there's not much point in creating the pdf in the first place

[Copilot]

@copilot the pdfs seem to be rastered jpegs. since the plots are SVGs, can't we create pdfs with vector graphics? otherwise there's not much point in creating the pdf in the first place

Fixed in 1680551. PDF export now sends the chart SVG through jsPDF/svg2pdf so the generated PDFs keep vector drawing commands instead of embedding a rasterized JPEG.

[samsta]

@copilot the legend doesn't show the gradient scale, it's just one solid color, see attached
keybpmmap-polar.pdf

[Copilot]

@copilot the legend doesn't show the gradient scale, it's just one solid color, see attached
keybpmmap-polar.pdf

Fixed in 39af9a6. The legend scale now renders as a strip of narrow vector-filled rectangles instead of relying on an SVG gradient, so the exported PDF keeps the full color ramp.

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