Close the missing canvas-area wrapper in the invoice PDF designer so the properties panel sits in the third grid column beside the canvas instead of below it.
When saving template JSON from the designer, read items-table and expenses-table width, colors, and separator line settings from the Konva group children so exports match user edits. Scale column widths to the chosen table width and emit a style block for ReportLab.
In the ReportLab renderer, scale column widths to element.width, wrap tables in a two-column outer table to honor horizontal x offset relative to the left margin, and apply borderColor and borderWidth from template style.
Extend the JSON-to-HTML preview converter so table header text, row text, row background, and border width reflect the same style keys used on export (fixes preview vs PDF mismatch for issue #622).
Dries Peeters
19f6636c0b