Implement SignalR integration and refactor WeatherPage

Added SignalR for real-time progress updates during weather data fetch. Refactored WeatherPage to use a new reusable WeatherGrid component and SignalRHelper. Improved loading UI with a radial progress indicator.

Api/Program.cs

@@ -15,9 +15,10 @@ builder.Services.AddCors(options =>
 {
     options.AddDefaultPolicy(policy =>
     {
-        policy.AllowAnyOrigin()
+        policy.WithOrigins("http://localhost:5173")
             .AllowAnyHeader()
-            .AllowAnyMethod();
+            .AllowAnyMethod()
+            .AllowCredentials();
     });
 });
 
@@ -41,6 +42,14 @@ var summaries = new[]
 
 app.MapGet("/weatherforecast", async () =>
     {
+        var hub = app.Services.GetRequiredService<IHubContext<WeatherUpdateHub>>();
+        for (var i = 0; i < 100; i++)
+        {
+            await hub.Clients.All.SendAsync("ProgressUpdate", "None", $$"""{"percentage": "{{i}}", "message": "{{DateTime.Now.Millisecond}}"}""");
+            await Task.Delay(100);
+        }
+
+
         var forecast = Enumerable.Range(1, 2500).Select(index =>
                 new WeatherForecast
                 (

Api/SignalR/SignalRSendService.cs

@@ -18,7 +18,7 @@ namespace Api.SignalR
                 logger.LogInformation("Background service sending message at: {Time}", DateTime.Now);
 
                 // Send a message to all connected clients.
-                await hubContext.Clients.User("user1234").SendAsync(
+                await hubContext.Clients.All.SendAsync(
                     "ReceiveMessage", // This is the client method name.
                     "Background Service", // Example sender.
                     $"Hello from the background task at {DateTime.Now:F}", // The message.