Raise deployment target to iOS 26.0; enable CarPlay Live Activity

- IPHONEOS_DEPLOYMENT_TARGET 17.0 -> 26.0 (iPhone 11+, Apple's current floor)
- Widget CarPlay disfavor is now unconditional (no #available guard)
- Live Activity gains supplementalActivityFamilies([.small]) so it renders
  in the car's small slot on CarPlay Ultra (display-only: FuelBoard has no
  CarPlay entitlement, car taps can't launch anything)

FuelBoard.xcodeproj/project.pbxproj

@@ -251,7 +251,7 @@
 					"DEBUG=1",
 					"$(inherited)",
 				);
-				IPHONEOS_DEPLOYMENT_TARGET = 17.0;
+				IPHONEOS_DEPLOYMENT_TARGET = 26.0;
 				MTL_ENABLE_DEBUG_INFO = INCLUDE_SOURCE;
 				ONLY_ACTIVE_ARCH = YES;
 				SDKROOT = iphoneos;
@@ -276,7 +276,7 @@
 				ENABLE_STRICT_OBJC_MSGSEND = YES;
 				GCC_C_LANGUAGE_STANDARD = gnu11;
 				GCC_NO_COMMON_BLOCKS = YES;
-				IPHONEOS_DEPLOYMENT_TARGET = 17.0;
+				IPHONEOS_DEPLOYMENT_TARGET = 26.0;
 				MTL_ENABLE_DEBUG_INFO = NO;
 				SDKROOT = iphoneos;
 				SWIFT_COMPILATION_MODE = wholemodule;

FuelBoardWidgets/FuelBoardLiveActivityView.swift

@@ -10,7 +10,10 @@ import WidgetKit
 
 /// The Live Activity itself — registered in the widget bundle alongside the
 /// regular price widget. No CarPlay entitlement involved: this renders on the
-/// Lock Screen, Dynamic Island, and (iOS 26+ / CarPlay Ultra) the car display.
+/// Lock Screen, Dynamic Island, and the car display (CarPlay Ultra, iOS 26+).
+/// `.supplementalActivityFamilies([.small])` makes it eligible for the car's
+/// small Live Activity slot — display-only there (FuelBoard is not a
+/// CarPlay-enabled app, so car-side taps can't launch anything).
 struct FuelBoardLiveActivity: Widget {
     var body: some WidgetConfiguration {
         ActivityConfiguration(for: FuelBoardLiveActivityAttributes.self) { context in
@@ -37,6 +40,7 @@ struct FuelBoardLiveActivity: Widget {
                     .font(.caption2.bold().monospacedDigit())
             }
         }
+        .supplementalActivityFamilies([.small])
     }
 }
 

FuelBoardWidgets/FuelPriceWidget.swift

@@ -38,18 +38,9 @@ struct FuelPriceWidget: Widget {
         // CarPlay: mark as disfavored — FuelBoard is not a CarPlay app, so
         // widget taps there can never launch Maps (Apple only allows a widget
         // to launch its own app in CarPlay, and only CarPlay-enabled apps).
-        // Disfavored = read-only in the car, no dead interaction. The
-        // locations array is empty below iOS 26 where `.carPlay` doesn't
-        // exist, making the modifier a harmless no-op there.
+        // Disfavored = read-only in the car, no dead interaction.
         baseConfiguration()
-            .disfavoredLocations(carPlayLocations, for: [.systemSmall])
-    }
-
-    private var carPlayLocations: [WidgetLocation] {
-        if #available(iOS 26.0, *) {
-            return [.carPlay]
-        }
-        return []
+            .disfavoredLocations([.carPlay], for: [.systemSmall])
     }
 
     private func baseConfiguration() -> some WidgetConfiguration {