feat(claude-do): merge UI-Prozess loggt auf Platte (ui-.log) + fehlgeschlagene Hub-

ClaudeDo-Task: d2ae3831-733f-4d40-93d7-70c93da11590

src/ClaudeDo.Ui/ClaudeDo.Ui.csproj

@@ -17,6 +17,7 @@
     <PackageReference Include="Microsoft.Win32.Registry" Version="5.0.0" />
     <PackageReference Include="Duende.IdentityModel.OidcClient" Version="7.1.0" />
     <PackageReference Include="Iciclecreek.Avalonia.Terminal" Version="2.0.3" />
+    <PackageReference Include="Serilog" Version="4.0.0" />
   </ItemGroup>
 
   <ItemGroup>

src/ClaudeDo.Ui/Services/WorkerClient.cs

@@ -304,6 +304,11 @@ public partial class WorkerClient : ObservableObject, IAsyncDisposable, IWorkerC
             ok = true;
             return result;
         }
+        catch (Exception ex) when (ex is not OperationCanceledException)
+        {
+            Serilog.Log.Warning(ex, "Hub call {method_name} failed", method);
+            return default;
+        }
         catch { return default; }
         finally { OperationTiming.Shared.Record("hub", method, sw.Elapsed, ok); }
     }
@@ -318,6 +323,11 @@ public partial class WorkerClient : ObservableObject, IAsyncDisposable, IWorkerC
             await invoke();
             ok = true;
         }
+        catch (Exception ex)
+        {
+            Serilog.Log.Warning(ex, "Hub call {method_name} failed", method);
+            throw;
+        }
         finally { OperationTiming.Shared.Record("hub", method, sw.Elapsed, ok); }
     }
 
@@ -332,6 +342,11 @@ public partial class WorkerClient : ObservableObject, IAsyncDisposable, IWorkerC
             ok = true;
             return result;
         }
+        catch (Exception ex)
+        {
+            Serilog.Log.Warning(ex, "Hub call {method_name} failed", method);
+            throw;
+        }
         finally { OperationTiming.Shared.Record("hub", method, sw.Elapsed, ok); }
     }
 

src/ClaudeDo.Ui/ViewModels/IslandsShellViewModel.cs

@@ -208,6 +208,9 @@ public sealed partial class IslandsShellViewModel : ViewModelBase, IDisposable
 
     private void FlashFooter(string message, WorkerLogLevel level)
     {
+        if (level == WorkerLogLevel.Error)
+            Serilog.Log.Warning("Footer error: {message}", message);
+
         WorkerLogText = $"{DateTime.Now:HH:mm} · {message}";
         WorkerLogLevel = level;
         IsWorkerLogVisible = true;