Build 10: one data URL for a custom station

This was the last iPhone and iPad build until 13, because the next two builds were Mac only.

Changed

• Custom stations. The Custom URL source takes one Full URL for every model. Per-model URLs still work.
• Errors. Import and download errors stay on screen for 20 seconds instead of 4 or 5, long messages wrap, and a failed copy says why.
• Cards and chart containers have tighter padding and smaller corners.
• On iPad, selecting a station on the map animates.