feat: add real watch companion and dual IPA build workflow

Shared/FuelStore.swift

@@ -339,6 +339,8 @@ struct FuelStore {
     static let liveActivityRadiusKey = "fuelboard.liveActivityRadiusMiles" // Int miles (5/10/15)
     static let onboardingCompletedKey = "fuelboard.onboardingCompleted" // Bool
     static let lastRefreshKey = "fuelboard.lastRefresh"      // TimeInterval (seconds since 1970)
+    static let watchRefreshRequestKey = "fuelboard.watchRefreshRequest" // TimeInterval (seconds since 1970)
+    static let watchRefreshHandledKey = "fuelboard.watchRefreshHandled" // TimeInterval (seconds since 1970)
     static let relaySourceKey = "fuelboard.relaySource"      // String — "api" | "csv"
     static let stationCountKey = "fuelboard.stationCount"    // String — station count
     static let dataUpdatedKey = "fuelboard.dataUpdated"      // String — govUK dataset update time
@@ -846,6 +848,34 @@ struct FuelStore {
         saveString(String(date.timeIntervalSince1970), service: lastRefreshKey)
     }
 
+    static func requestWatchRefresh(_ date: Date = Date()) {
+        saveString(String(date.timeIntervalSince1970), service: watchRefreshRequestKey)
+    }
+
+    static func loadWatchRefreshRequest() -> Date? {
+        if let raw = loadString(service: watchRefreshRequestKey), let ts = TimeInterval(raw) {
+            return Date(timeIntervalSince1970: ts)
+        }
+        return nil
+    }
+
+    static func markWatchRefreshHandled(_ date: Date = Date()) {
+        saveString(String(date.timeIntervalSince1970), service: watchRefreshHandledKey)
+    }
+
+    static func loadWatchRefreshHandled() -> Date? {
+        if let raw = loadString(service: watchRefreshHandledKey), let ts = TimeInterval(raw) {
+            return Date(timeIntervalSince1970: ts)
+        }
+        return nil
+    }
+
+    static var hasPendingWatchRefreshRequest: Bool {
+        guard let requested = loadWatchRefreshRequest() else { return false }
+        guard let handled = loadWatchRefreshHandled() else { return true }
+        return requested > handled
+    }
+
     // MARK: Relay metadata — shown in Settings → About. Written after each
     // successful full fetch so the About section reflects the live source.