Enhance SwarmUI integration by adding swarm connection status to the API and updating client-side components to reflect this status. Improved localization strings for various SwarmUI states and refactored ApplicantsDialog and PersonCard components to utilize the new connection information, ensuring a more responsive user experience.

tests/HSchool.Server.Tests/SwarmUiClientTests.cs

@@ -34,6 +34,44 @@ public class SwarmUiClientTests
         Assert.Contains("/API/GenerateText2Image", handler.Requests[1]);
     }
 
+    [Fact]
+    public async Task ProbeAsync_ReturnsTrueWhenSessionOpens()
+    {
+        var handler = new FakeHandler();
+        var http = new HttpClient(handler) { BaseAddress = new Uri("http://swarm.test/") };
+        var client = new SwarmUiClient(
+            http,
+            Options.Create(new SwarmUiOptions { BaseUrl = "http://swarm.test", TimeoutSeconds = 30 }),
+            NullLogger<SwarmUiClient>.Instance);
+
+        var ok = await client.ProbeAsync(TimeSpan.FromSeconds(5), CancellationToken.None);
+
+        Assert.True(ok);
+        Assert.Single(handler.Requests);
+        Assert.Contains("/API/GetNewSession", handler.Requests[0]);
+    }
+
+    [Fact]
+    public async Task ProbeAsync_ReturnsFalseWhenUnreachable()
+    {
+        var handler = new FailingHandler();
+        var http = new HttpClient(handler) { BaseAddress = new Uri("http://swarm.test/") };
+        var client = new SwarmUiClient(
+            http,
+            Options.Create(new SwarmUiOptions { BaseUrl = "http://swarm.test", TimeoutSeconds = 30 }),
+            NullLogger<SwarmUiClient>.Instance);
+
+        var ok = await client.ProbeAsync(TimeSpan.FromSeconds(5), CancellationToken.None);
+
+        Assert.False(ok);
+    }
+
+    private sealed class FailingHandler : HttpMessageHandler
+    {
+        protected override Task<HttpResponseMessage> SendAsync(HttpRequestMessage request, CancellationToken cancellationToken) =>
+            Task.FromResult(new HttpResponseMessage(HttpStatusCode.ServiceUnavailable));
+    }
+
     private sealed class FakeHandler : HttpMessageHandler
     {
         public List<string> Requests { get; } = [];