fix(wizard): enable Plan My Trip button with default values

- Add debug toggle in Settings to override Pro subscription status (DEBUG builds only, defaults to true)
- Auto-validate wizard step flags on appear so button enables without explicit user interaction:
  - DatesStep: calls updateHasSetDates() on appear
  - RoutePreferenceStep: sets hasSetRoutePreference on appear
  - RepeatCitiesStep: sets hasSetRepeatCities on appear

Previously, canPlanTrip required all flags to be explicitly set by user interaction, even when valid defaults were showing.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

SportsTime/Core/Store/StoreManager.swift

@@ -31,10 +31,30 @@ final class StoreManager {
     private(set) var isLoading = false
     private(set) var error: StoreError?
 
+    // MARK: - Debug Override (DEBUG builds only)
+
+    #if DEBUG
+    private static let debugProOverrideKey = "debugProOverride"
+
+    /// When true, isPro returns true regardless of actual subscription status.
+    /// Defaults to true in debug builds. Only compiled in DEBUG configuration.
+    var debugProOverride: Bool {
+        get {
+            UserDefaults.standard.object(forKey: Self.debugProOverrideKey) as? Bool ?? true
+        }
+        set {
+            UserDefaults.standard.set(newValue, forKey: Self.debugProOverrideKey)
+        }
+    }
+    #endif
+
     // MARK: - Computed Properties
 
     var isPro: Bool {
-        !purchasedProductIDs.intersection(Self.proProductIDs).isEmpty
+        #if DEBUG
+        if debugProOverride { return true }
+        #endif
+        return !purchasedProductIDs.intersection(Self.proProductIDs).isEmpty
     }
 
     var monthlyProduct: Product? {