Improve process control and chart export

Process control gets smarter defaults, better filtering, and a new PDF export for sharing charts outside TofuPilot.

• Added A4 landscape PDF export for charts with title and "Exported by" attribution
• Added validators column and measurement outcome filter to the process control measurement table
• Added default 30-day date filter on runs, logs, and API calls pages for faster initial load
• Fixed invisible connecting lines between points on control charts
• Fixed missing procedure, phase, unit, and run outcome on measurement detail page