[ps2]

The Glucose Graph complication only fills about three quarters of its slot's width on a 45 mm watch. The watch app renders the chart as a 171×54 image, the old ClockKit graphic rectangular size, and the widget shows it aspect-fit under the header line. The space under the header is shorter than 54 pt, so the image is scaled down and leaves a gap on the right.

This moves the drawing into the widget:

• The app publishes the graph's data in ComplicationSnapshot instead of a PNG. That's plain numbers in the display unit: target ranges, the active override, readings, the prediction, and the axis bounds and labels. It's a few KB of JSON, and the extension still links nothing of Loop's.
• The widget draws it with a SwiftUI Canvas in whatever space the slot leaves under the header, so it fills the slot on every watch size.
• The drawing follows ComplicationChartManager: 4 h centered on now, the same bands, dots, dashed prediction and labels.
• Each timeline entry is drawn at its own date, so the graph stays aligned with the stale and freshness moments the timeline already carries. The app keeps an extra hour of data ahead for those entries.
• The ClockKit complications still use ComplicationChartManager. The PNG in the app group is no longer written.

Testing:

• ComplicationSnapshotTests pass, with a new round trip of a snapshot carrying a graph.
• The full workspace build succeeds, for the watch simulator and for a device.
• It hasn't run on a watch yet. The same commit applies cleanly on the Sport Mode line.