live activity: robust full-vs-compact split; scale long station names

The adaptive layout picks the full three-column view when there's Lock
Screen width and a compact price strip in the small CarPlay/Watch slot.
Tighten the discriminant (rich ≥290pt, compact ≤220pt) so iPhone/iPad
always get the full view and only genuinely small slots get the compact
strip. Long station names used to clip at inconsistent points across
the rich/compact/Dynamic Island views; both bodies now scale + tail-
truncate so the caption stays consistent regardless of station name.

FuelBoardWidgets/FuelBoardLiveActivityView.swift

@@ -59,16 +59,24 @@ struct FuelBoardLiveActivity: Widget {
 private struct FuelBoardLiveActivityView: View {
     let context: ActivityViewContext<FuelBoardLiveActivityAttributes>
 
+    /// Full rich layout needs at least this much width. iPhone/iPad Lock
+    /// Screen Live Activities are always wider than this, so they get the
+    /// full view; the CarPlay/Apple Watch Smart Stack small slot is far
+    /// narrower, so it reliably falls through to `compactBody`.
+    private let richMinWidth: CGFloat = 290
+    /// Only genuinely small slots get the compact strip — cap it so a
+    /// mid-width surface can never squeeze the full view into the car.
+    private let compactMaxWidth: CGFloat = 220
+
     var body: some View {
         Link(destination: context.state.mapsURL) {
             ViewThatFits(in: .horizontal) {
                 // rich first — wins on full-width Lock Screen / banner
                 richBody
-                    // CarPlay / Watch small slot is far narrower than this,
-                    // so ViewThatFits reliably falls through to compactBody.
-                    .frame(minWidth: 280)
+                    .frame(minWidth: richMinWidth)
                 // compact fallback — the car's small supplemental slot
                 compactBody
+                    .frame(maxWidth: compactMaxWidth)
             }
         }
     }
@@ -90,6 +98,8 @@ private struct FuelBoardLiveActivityView: View {
                     .font(.subheadline)
                     .foregroundStyle(.secondary)
                     .lineLimit(1)
+                    .minimumScaleFactor(0.75)
+                    .truncationMode(.tail)
             }
             .frame(maxWidth: .infinity, alignment: .leading)
 
@@ -127,6 +137,8 @@ private struct FuelBoardLiveActivityView: View {
                 .font(.system(size: 9))
                 .foregroundStyle(.secondary)
                 .lineLimit(1)
+                .minimumScaleFactor(0.7)
+                .truncationMode(.tail)
         }
         .padding(8)
     }