live activity: explicit badge (dark circle + bright pump); fix alignment look

fuelpump.circle.fill's first hierarchical style hits the PUMP, not the
circle, so the earlier darkened colour landed on the pump and the circle
stayed white (user: 'I didn't want the fuel pump darker I wanted the
white circle darker'). Rebuild the brand glyph from two explicit shapes:
a light-grey (.86) Circle badge + a bright fuel-tinted fuelpump.fill, so
circle vs pump colours are unambiguous and the badge centres cleanly with
the two-line text block.

Add a DEBUG-only -qaLiveActivity <fuel> launch hook that starts a Live
Activity with a long station name so the Lock Screen can be rendered in
the Simulator and verified by pixels (pump bright green 43,193,81; badge
grey 202,201,202).

FuelBoardWidgets/FuelBoardLiveActivityView.swift

@@ -73,12 +73,13 @@ private struct FuelBoardLiveActivityView: View {
     /// "ideal" width past the iPhone Lock Screen and collapses the full card).
     private let compactWidthThreshold: CGFloat = 280
 
-    /// Slightly darkened fuel tint for the pump circle so the white pump
-    /// symbol keeps contrast against the bright Lock Screen / card background
-    /// (the raw palette colours like yellow #FFD60A are too light to sit under
-    /// a white glyph).
-    private var pumpCircleColor: Color {
-        context.state.fuel.tintColor.mix(with: .black, by: 0.18)
+    /// The badge circle behind the pump. The user calls this "the white
+    /// circle" and wants it slightly darkened for contrast against the bright
+    /// fuel pump. Built as an explicit grey disc (the light-grey "white circle
+    /// darker") — NOT part of the SF Symbol glyph, so it can never swallow the
+    /// darkened colour the way `fuelpump.circle.fill` did.
+    private var badgeCircleColor: Color {
+        Color(white: 0.86)
     }
 
     var body: some View {
@@ -107,11 +108,20 @@ private struct FuelBoardLiveActivityView: View {
     /// Full three-column design (unchanged): brand glyph · fuel+station · price.
     private var richBody: some View {
         HStack(spacing: 12) {
-            // LEFT — station brand glyph
-            Image(systemName: "fuelpump.circle.fill")
-                .font(.system(size: 32))
-                .foregroundStyle(pumpCircleColor, .white)
-                .frame(width: 40, height: 40)
+            // LEFT — station brand badge: an explicit darkened circle with a
+            // bright fuel-tinted pump. Built from two shapes so the circle
+            // colour and pump colour are unambiguous (the myth that
+            // fuelpump.circle.fill's first style is the circle is what put the
+            // darkened colour on the pump).
+            ZStack {
+                Circle()
+                    .fill(badgeCircleColor)
+                    .frame(width: 40, height: 40)
+                Image(systemName: "fuelpump.fill")
+                    .font(.system(size: 19, weight: .semibold))
+                    .foregroundStyle(context.state.fuel.tintColor)
+            }
+            .frame(width: 40, height: 40)
 
             // MIDDLE — fuel + station
             VStack(alignment: .leading, spacing: 2) {