live activity: select rich vs compact by actual GeometryReader width

ViewThatFits measures each child's IDEAL (untruncated) width to decide
fit, and a flexible .frame(maxWidth:.infinity) middle column does not cap
that ideal — so a long station name (e.g. 5-mi Phoenix Filling Stations)
inflated richBody's ideal past the iPhone Lock Screen width and fell back
to the compact strip. Replace the ViewThatFits branch with a
GeometryReader that reads the ACTUAL proposed width and shows the full
three-column card at/above 280pt, compact below. Content-independent, so a
long name can no longer collapse the iPhone card.

FuelBoardWidgets/FuelBoardLiveActivityView.swift

@@ -65,27 +65,26 @@ struct FuelBoardLiveActivity: Widget {
 private struct FuelBoardLiveActivityView: View {
     let context: ActivityViewContext<FuelBoardLiveActivityAttributes>
 
-    /// Full card needs at least this much width; iPhone/iPad Lock Screen is
-    /// always wider, so they always get it. Only genuinely small slots
-    /// (CarPlay small / Watch smart stack) fall through to `compactBody`.
-    private let richMinWidth: CGFloat = 280
-    /// Cap the compact strip so a mid-width surface can't sneak it in.
-    private let compactMaxWidth: CGFloat = 230
+    /// Below this ACTUAL proposed width we show the compact strip (CarPlay
+    /// small / Watch smart stack); at/above it we show the full card. The
+    /// decision is made from the real space the system hands the body via
+    /// GeometryReader, NOT from ViewThatFits ideal-width measurement — the
+    /// latter is broken for truncating text (a long station name inflates the
+    /// "ideal" width past the iPhone Lock Screen and collapses the full card).
+    private let compactWidthThreshold: CGFloat = 280
 
     var body: some View {
         Link(destination: context.state.mapsURL) {
-            ViewThatFits(in: .horizontal) {
-                // rich FIRST — wins on the full-width iPhone/iPad Lock Screen.
-                // Its middle column is flexible + line-limited, so a LONG
-                // station name truncates in place and never inflates the ideal
-                // width (which used to trick ViewThatFits into falling back to
-                // compact on iPhone).
-                richBody
-                    .frame(minWidth: richMinWidth)
-                // compact fallback — the small CarPlay / Watch smart-stack
-                // strip: fuel · price · station distance (no app name).
-                compactBody
-                    .frame(maxWidth: compactMaxWidth)
+            GeometryReader { geo in
+                // Branch on the ACTUAL proposed width. iPhone/iPad offer the
+                // full Lock Screen width (>= threshold) → rich card, no matter
+                // how long the station name is. Truly small slots (CarPlay /
+                // Watch) offer much less → compact strip.
+                if geo.size.width >= compactWidthThreshold {
+                    richBody
+                } else {
+                    compactBody
+                }
             }
         }
     }