The Context preferences card gains its eighth row — the trend
duration curve — served across both settings generations: the V3
`settings.register` schema and the V4 Config form (a `.volatile()`
field, so an edit never remounts the entry). The client settings store
parses it fail-open like its neighbours; the trend card's Duration
toggle seeds its mount state from it (default on), and in-chart
toggling stays mount-local and never writes back.
bowenliang123
4dcdfafbef
