refactor(ui): remove unused Sort button from MyDay header

It was a no-op placeholder command; removed the button, command,
locale keys, and now-unused Icon.Sort geometry.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

src/ClaudeDo.Localization/locales/de.json

@@ -61,7 +61,6 @@
     }
   },
   "tasks": {
-    "sortTip": "Sortieren",
     "showCompletedTip": "Abgeschlossene anzeigen",
     "listSettingsTip": "Listeneinstellungen",
     "addPlaceholder": "Aufgabe hinzufügen…",

src/ClaudeDo.Localization/locales/en.json

@@ -61,7 +61,6 @@
     }
   },
   "tasks": {
-    "sortTip": "Sort",
     "showCompletedTip": "Show completed",
     "listSettingsTip": "List settings",
     "addPlaceholder": "Add a task…",

src/ClaudeDo.Ui/Design/IslandStyles.axaml

@@ -70,9 +70,6 @@
     <!-- Icon.Trash -->
     <StreamGeometry x:Key="Icon.Trash">M4 7h16M10 11v6M14 11v6M5 7l1 13a1 1 0 0 0 1 1h10a1 1 0 0 0 1-1l1-13M9 7V4h6v3</StreamGeometry>
 
-    <!-- Icon.Sort (filled bars, decreasing width) -->
-    <StreamGeometry x:Key="Icon.Sort">M4 6 H20 V8 H4 Z M4 11 H16 V13 H4 Z M4 16 H11 V18 H4 Z</StreamGeometry>
-
     <!-- Icon.Broom (filled: handle + binding band + flared bristles) -->
     <StreamGeometry x:Key="Icon.Broom">M11 3 H13 V10 H11 Z M8.5 10 H15.5 V12 H8.5 Z M9 12 H15 L17 21 H7 Z</StreamGeometry>
 

src/ClaudeDo.Ui/ViewModels/Islands/TasksIslandViewModel.cs

@@ -706,9 +706,6 @@ public sealed partial class TasksIslandViewModel : ViewModelBase
     [RelayCommand]
     private void ToggleShowCompleted() => IsShowingCompleted = !IsShowingCompleted;
 
-    [RelayCommand]
-    private void Sort() { /* placeholder — UI-only */ }
-
     public event EventHandler? OpenListSettingsRequested;
 
     [RelayCommand]

src/ClaudeDo.Ui/Views/Islands/TasksIslandView.axaml

@@ -28,9 +28,6 @@
                   IsVisible="{Binding HasStatusPill}">
             <TextBlock Text="{Binding StatusPill}"/>
           </Border>
-          <Button Classes="icon-btn" Command="{Binding SortCommand}" ToolTip.Tip="{loc:Tr tasks.sortTip}">
-            <PathIcon Width="15" Height="15" Data="{StaticResource Icon.Sort}"/>
-          </Button>
           <Button Classes="icon-btn" Classes.active="{Binding IsShowingCompleted}"
                   Command="{Binding ToggleShowCompletedCommand}"
                   ToolTip.Tip="{loc:Tr tasks.showCompletedTip}">