Use ContentView and add station input UI

- Replace the placeholder window content with ContentView and implement a basic station lookup UI.
- Added a station code TextField, Refresh button that triggers an async load, loading indicator, and error message display. Introduces a Table for TrainStatusRow with columns for number, route, on-time and platform.
- Started plumbing for row population (work in progress).
- Also tweaked window title and fixes station comment (Ashland).

Sources/AmtrakStatus/AmtrakStatusApp.swift

@@ -4,9 +4,8 @@ import DefaultBackend
 @main
 struct AmtrakStatusApp: App {
     var body: some Scene {
-        WindowGroup("AmtrakStatus") {
+        WindowGroup("Amtrak Status") {
-            Text("Hello, World!")
+            ContentView()
-                .padding()
         }
     }
 }

Sources/AmtrakStatus/ContentView.swift

@@ -3,14 +3,45 @@ import SwiftCrossUI
 struct ContentView: View {
     @State var client = AmtrakClient()
     
-    @State var stationCode = "ASD" // Ashville, VA
+    @State var stationCode = "ASD" // Ashland, VA
     @State var rows: [TrainStatusRow] = []
     @State var isLoading = false
     @State var errorMessage: String?
     
     var body: some View {
+        VStack {
+            // TODO: Add pre-selected options in the form of buttons like the original
             HStack {
+                Text("Station Code:")
+                TextField("e.g. ASD", text: $stationCode)
+                    .frame(width: 100)
                 
+                Button("Refresh")
+                {
+                    Task {
+                        await loadTrainStatus(forStationCode: normalizedStationCode)
+                    }
+                }.disabled(normalizedStationCode.isEmpty || isLoading)
+            }.padding(10)
+            
+            if let errorMessage {
+                Text(errorMessage).padding(10)
+            }
+            
+            Table(rows)
+            {
+                TableColumn("Number", value: \TrainStatusRow.trainNum)
+                TableColumn("Number", value: \TrainStatusRow.routeName)
+                TableColumn("On Time", value: \TrainStatusRow.onTime)
+                TableColumn("Platform", value: \TrainStatusRow.platform)
+                
+            }.overlay(alignment: .bottomTrailing)
+            {
+                if isLoading {
+                    ProgressView()
+                        .padding(10)
+                }
+            }
         }.padding()
             .onAppear {
                 Task {
@@ -44,6 +75,11 @@ struct ContentView: View {
                 return
             }
             
+            var newRows: [TrainStatusRow] = []
+            for number in trainNumbers {
+                // let trains = await client.fet
+            }
+            
         } catch AmtrakError.stationNotFound(let code)
         {
             errorMessage = "Station \(code) not foudn"