M2: aurora oval map !9

Stacked on !8 (targets m2-backend).

• Feeds.Ovation: SWPC OVATION grid (lon, lat, probability), non-zero cells kept.
• SkyRenderer: Natural Earth 1:110m coastlines (public domain, 57 KB), PolarProjection (azimuthal equidistant, observer's meridian down), AuroraMap.
• Sun tab: aurora section with forecast time and explanation.

Note: after a package resource change, run xcodegen generate again or the new file is missing from the bundle (crashed once until regenerated).

Verified in the iOS 27 simulator with live OVATION data. swift test: 23 pass.