- New Sort by value 'Favourites' in Edit Widget (per-widget config).
- ParameterSummary hides the Distance picker when Favourites is selected
(favourites are not radius-bound).
- Favourites mode reads keychain favourites (shared access group works on
SideStore free even without App Groups), filters to the widget's fuel,
refreshes prices from a focused relay fetch when in range, and ranks
cheapest-first with distance tiebreak. Not radius-filtered.
- App now re-saves refreshed favourites to keychain after every fetch so
the widget shows current prices instead of star-time snapshots.
- Empty state + headings adapt to favourites mode. 35 tests pass.