Added deep links for widgets

- Widgets will now open the appropriate DetailView in the app when you tap on them.
  - ...except when they don't. This is still a little buggy. It works correctly when the app is already alive in the background but only works about 75% of the time when the app isn't running yet.
- Unified the loading view into a shared view used in all places requiring loading

TigerDine/TigerDineApp.swift

@@ -13,9 +13,11 @@ import WidgetKit
 struct TigerDineApp: App {
     // The model needs to be instantiated here so that it's also available in the context of the refresh background task.
     @State private var model = DiningModel()
+    @State private var targetLocationId: Int?
+    @State private var handledLocationId: Int?
     
     /// Triggers a refresh on the model that will only make network requests if the cache is stale, and then schedules the next refresh.
-    func handleAppRefresh() async {
+    private func handleAppRefresh() async {
         do {
             try await model.getHoursByDayCached()
             WidgetCenter.shared.reloadAllTimelines()
@@ -26,10 +28,29 @@ struct TigerDineApp: App {
         scheduleNextRefresh()
     }
     
+    private func parseOpenedURL(url: URL) -> Int? {
+        guard url.scheme == "tigerdine" else { return nil }
+        
+        let components = URLComponents(url: url, resolvingAgainstBaseURL: false)!
+        if components.path == "/location" {
+            print("opening to a location")
+            if let queryItems = components.queryItems {
+                if queryItems.map(\.name).contains("id") {
+                    return Int(queryItems.first(where: { $0.name == "id" })!.value!)
+                }
+            }
+        }
+        return nil
+    }
+    
     var body: some Scene {
         WindowGroup {
-            ContentView()
+            ContentView(targetLocationId: $targetLocationId, handledLocationId: $handledLocationId)
                 .environment(model)
+                .onOpenURL { url in
+                    targetLocationId = parseOpenedURL(url: url)
+                    handledLocationId = nil
+                }
         }
         .backgroundTask(.appRefresh("dev.ninjacheetah.RIT-Dining.refresh")) {
             await handleAppRefresh()