feat(ui): chromeless three-island shell

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

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+<UserControl xmlns="https://github.com/avaloniaui"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:vm="using:ClaudeDo.Ui.ViewModels.Islands"
+             x:Class="ClaudeDo.Ui.Views.Islands.DetailsIslandView"
+             x:DataType="vm:DetailsIslandViewModel">
+  <TextBlock Margin="14" Text="Details (placeholder)"
+             Foreground="{DynamicResource TextDimBrush}"/>
+</UserControl>

src/ClaudeDo.Ui/Views/Islands/DetailsIslandView.axaml.cs

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+using Avalonia.Controls;
+
+namespace ClaudeDo.Ui.Views.Islands;
+
+public partial class DetailsIslandView : UserControl
+{
+    public DetailsIslandView() { InitializeComponent(); }
+}

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

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+<UserControl xmlns="https://github.com/avaloniaui"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:vm="using:ClaudeDo.Ui.ViewModels.Islands"
+             x:Class="ClaudeDo.Ui.Views.Islands.ListsIslandView"
+             x:DataType="vm:ListsIslandViewModel">
+  <TextBlock Margin="14" Text="Lists (placeholder)"
+             Foreground="{DynamicResource TextDimBrush}"/>
+</UserControl>

src/ClaudeDo.Ui/Views/Islands/ListsIslandView.axaml.cs

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+using Avalonia.Controls;
+
+namespace ClaudeDo.Ui.Views.Islands;
+
+public partial class ListsIslandView : UserControl
+{
+    public ListsIslandView() { InitializeComponent(); }
+}

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

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+<UserControl xmlns="https://github.com/avaloniaui"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:vm="using:ClaudeDo.Ui.ViewModels.Islands"
+             x:Class="ClaudeDo.Ui.Views.Islands.TasksIslandView"
+             x:DataType="vm:TasksIslandViewModel">
+  <TextBlock Margin="14" Text="Tasks (placeholder)"
+             Foreground="{DynamicResource TextDimBrush}"/>
+</UserControl>

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

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+using Avalonia.Controls;
+
+namespace ClaudeDo.Ui.Views.Islands;
+
+public partial class TasksIslandView : UserControl
+{
+    public TasksIslandView() { InitializeComponent(); }
+}