Widget: keychain-free fresh defaults — drop defaultResult(), auto-populate at entry time

The small-widget skeleton (fresh widget stranded on the placeholder while
the medium populated in the gallery) traced to the small intent's default
configuration resolution: FavouriteFuelQuery/WidgetFavouriteQuery
defaultResult() read keychain in the gallery-preview/fresh-add path,
failing the whole default config and leaving no timeline. Configured
widgets bypassed defaultResult (stored values → lenient entities) — the
exact favourites-works/cheapest-closest-doesn't split.

- Remove defaultResult() from both queries: fresh configs now resolve
  from the static @Parameter(default:) values through lenient
  entities(for:) with ZERO storage reads.
- WidgetFavouriteQuery.entities(for:) skips the keychain name lookup for
  id-only (empty station) values.
- Auto-populate moves to makeEntry: empty pinned favourite → first
  favourite of the fuel (same rendered result as the old sheet default).
- Sheet keeps the dependent picker via suggestedEntities() + dependency;
  fresh widgets show static defaults until picked (approved tradeoff).

FuelBoardWidgets/FuelPriceWidget.swift

@@ -165,16 +165,29 @@ struct FuelPriceTimelineProvider<Configuration: WidgetConfigurationIntent & Widg
             // fuel, no radius. Freshen its price when a focused fetch covers
             // it. The chosen favourite wins; when it's missing or stale (fresh
             // widget, favourite removed, fuel row changed) fall back to the
-            // favourites fuel's cheapest favourite so the face is never blank.
+            // favourites fuel's first favourite so the face is never blank.
             if let chosen = configuration.favouriteChoice {
                 let favouriteFuelType = configuration.favouriteFuelChoice?.fuel ?? fuel
-                let pinned = favourites.first { $0.id == chosen.id }
-                    ?? favourites
+                // Fresh widget / static default (empty pinned favourite):
+                // auto-populate to the FIRST favourite of the fuel. This is
+                // the sheet's old defaultResult() auto-populate, moved to
+                // entry time so default-config resolution stays keychain-free
+                // (storage-backed defaultResult() stranding fresh small
+                // widgets on the skeleton placeholder).
+                let pinned: FavouriteEntry?
+                if chosen.stationID.isEmpty {
+                    pinned = favourites
                         .filter { $0.fuel == favouriteFuelType && $0.station.prices[favouriteFuelType] != nil }
-                        .min { lhs, rhs in
-                            (lhs.station.prices[favouriteFuelType] ?? .infinity) <
-                            (rhs.station.prices[favouriteFuelType] ?? .infinity)
-                        }
+                        .first
+                } else {
+                    pinned = favourites.first { $0.id == chosen.id }
+                        ?? favourites
+                            .filter { $0.fuel == favouriteFuelType && $0.station.prices[favouriteFuelType] != nil }
+                            .min { lhs, rhs in
+                                (lhs.station.prices[favouriteFuelType] ?? .infinity) <
+                                (rhs.station.prices[favouriteFuelType] ?? .infinity)
+                            }
+                }
                 if let pinned {
                     var station = pinned.station
                     if let location,