More chart styles and easier PDF starts

PDF sources are now available directly from the homepage composer as well as the Create page. Paid accounts can upload a document, review its processing cost, and continue into the same saved, reusable PDF workflow without first navigating to another screen.

The editor now offers separate area, line, bar, pie, radar, and radial chart blocks. Each starts with a useful default for its purpose, while the properties panel keeps the data editable and adds controls such as line curves, area fills, bar direction, donut totals, radar grids, radial progress and gauge layouts, labels, legends, axes, grid weight, and point markers where they apply.