feat(notes): notes get their own list, a day log and an Enter chain

The editor was reachable from one button that only appeared in My Day,
which is how it got forgotten. It is now a permanent sidebar entry next
to My Day and Planned, and it fills the tasks island rather than the
details pane, because a note list is content.

Inside, the date picker is gone: today sits at the top with the capture
box, older days follow as dated groups. Enter in a note saves it and
opens the next one, Shift+Enter breaks the line so notes can be several,
Backspace on an empty note deletes it and steps back up. Deleting also
has a visible hover button instead of only "clear the text and hope".
Agent-written notes carry a marker.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

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

@@ -1,38 +1,110 @@
 <UserControl xmlns="https://github.com/avaloniaui"
              xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
              xmlns:vm="using:ClaudeDo.Ui.ViewModels.Islands"
-             xmlns:ctl="using:ClaudeDo.Ui.Views.Controls"
              xmlns:loc="using:ClaudeDo.Ui.Localization"
              x:Class="ClaudeDo.Ui.Views.Islands.NotesEditorView"
              x:DataType="vm:NotesEditorViewModel">
-  <DockPanel Margin="16">
-    <StackPanel DockPanel.Dock="Top" Orientation="Horizontal" Spacing="8">
-      <Button Classes="btn" Content="&#x2039;" Command="{Binding PrevDayCommand}"/>
-      <ctl:ThemedDatePicker SelectedDate="{Binding CurrentDate, Mode=TwoWay}"/>
-      <Button Classes="btn" Content="&#x203A;" Command="{Binding NextDayCommand}"/>
-      <Button Classes="btn" Content="{loc:Tr notes.today}" Command="{Binding TodayCommand}"/>
-      <TextBlock Classes="meta" VerticalAlignment="Center" Text="{Binding CurrentDayLabel}"/>
-    </StackPanel>
 
-    <DockPanel DockPanel.Dock="Top" Margin="0,12,0,8">
-      <Button DockPanel.Dock="Right" Classes="btn" Content="{loc:Tr notes.add}" Margin="8,0,0,0"
-              Command="{Binding AddBulletCommand}"/>
-      <TextBox PlaceholderText="{loc:Tr notes.newNotePlaceholder}" Text="{Binding NewBulletText}">
-        <TextBox.KeyBindings>
-          <KeyBinding Gesture="Enter" Command="{Binding AddBulletCommand}"/>
-        </TextBox.KeyBindings>
-      </TextBox>
-    </DockPanel>
+  <UserControl.Styles>
+    <!-- A note reads as text, not as a form field: the box only shows itself under the pointer
+         and while it has focus. -->
+    <Style Selector="TextBox.note">
+      <Setter Property="Background" Value="Transparent"/>
+      <Setter Property="BorderThickness" Value="0"/>
+      <Setter Property="Padding" Value="4,3"/>
+      <Setter Property="MinHeight" Value="0"/>
+      <Setter Property="AcceptsReturn" Value="True"/>
+      <Setter Property="TextWrapping" Value="Wrap"/>
+    </Style>
+    <Style Selector="TextBox.note /template/ Border#PART_BorderElement">
+      <Setter Property="Background" Value="Transparent"/>
+      <Setter Property="BorderThickness" Value="0"/>
+    </Style>
 
-    <ScrollViewer>
-      <ItemsControl ItemsSource="{Binding Bullets}">
-        <ItemsControl.ItemTemplate>
-          <DataTemplate x:DataType="vm:NoteBulletViewModel">
-            <TextBox Text="{Binding Text}" Margin="0,2"
-                     LostFocus="OnBulletLostFocus"/>
-          </DataTemplate>
-        </ItemsControl.ItemTemplate>
-      </ItemsControl>
-    </ScrollViewer>
+    <Style Selector="Border.note-row">
+      <Setter Property="CornerRadius" Value="6"/>
+      <Setter Property="Padding" Value="10,1,6,1"/>
+      <Setter Property="Margin" Value="4,1"/>
+    </Style>
+    <Style Selector="Border.note-row:pointerover">
+      <Setter Property="Background" Value="{DynamicResource PeatSoftBrush}"/>
+    </Style>
+    <!-- Row actions stay out of the way until the row is hovered. -->
+    <Style Selector="Border.note-row Button.note-del">
+      <Setter Property="Opacity" Value="0"/>
+    </Style>
+    <Style Selector="Border.note-row:pointerover Button.note-del">
+      <Setter Property="Opacity" Value="1"/>
+    </Style>
+  </UserControl.Styles>
+
+  <DockPanel LastChildFill="True">
+
+    <!-- Today's capture box: Enter files the note and leaves the caret here for the next one. -->
+    <Border DockPanel.Dock="Top" Classes="add-task" Margin="16,14,16,10">
+      <Grid ColumnDefinitions="Auto,*,Auto">
+        <Border Grid.Column="0" Classes="add-task-plus" VerticalAlignment="Center">
+          <PathIcon Width="12" Height="12" Data="{StaticResource Icon.Plus}"
+                    Foreground="{DynamicResource TextFaintBrush}"/>
+        </Border>
+        <TextBox Grid.Column="1" x:Name="NewNoteBox" Classes="add-task-input"
+                 PlaceholderText="{loc:Tr notes.newNotePlaceholder}"
+                 Text="{Binding NewBulletText, Mode=TwoWay}"
+                 VerticalAlignment="Center" Margin="12,0,0,0">
+          <TextBox.KeyBindings>
+            <KeyBinding Gesture="Enter" Command="{Binding AddBulletCommand}"/>
+          </TextBox.KeyBindings>
+        </TextBox>
+        <Border Grid.Column="2" Classes="kbd kbd-enter" VerticalAlignment="Center"
+                IsVisible="{Binding #NewNoteBox.IsFocused}">
+          <TextBlock Text="{loc:Tr tasks.enterKey}"/>
+        </Border>
+      </Grid>
+    </Border>
+
+    <Panel>
+      <ScrollViewer>
+        <ItemsControl x:Name="RowsHost" ItemsSource="{Binding Rows}" Margin="10,0,10,12">
+          <ItemsControl.DataTemplates>
+
+            <DataTemplate DataType="vm:NoteDayHeaderViewModel">
+              <TextBlock Classes="eyebrow section-label" Margin="14,12,14,4" Text="{Binding Label}"/>
+            </DataTemplate>
+
+            <DataTemplate DataType="vm:NoteBulletViewModel">
+              <Border Classes="note-row">
+                <Grid ColumnDefinitions="Auto,*,Auto,Auto">
+                  <Ellipse Grid.Column="0" Width="4" Height="4" Margin="0,0,10,0"
+                           VerticalAlignment="Center"
+                           Fill="{DynamicResource TextFaintBrush}"/>
+                  <TextBox Grid.Column="1" Classes="note" Text="{Binding Text, Mode=TwoWay}"
+                           LostFocus="OnBulletLostFocus" KeyDown="OnBulletKeyDown"/>
+                  <PathIcon Grid.Column="2" Width="12" Height="12" Margin="6,0"
+                            VerticalAlignment="Center"
+                            IsVisible="{Binding FromAgent}"
+                            ToolTip.Tip="{loc:Tr notes.fromAgentTip}"
+                            Data="{StaticResource Icon.AgentSuggested}"
+                            Foreground="{DynamicResource TextFaintBrush}"/>
+                  <Button Grid.Column="3" Classes="icon-btn note-del"
+                          VerticalAlignment="Center"
+                          ToolTip.Tip="{loc:Tr notes.deleteTip}"
+                          Click="OnDeleteBulletClick">
+                    <PathIcon Classes="danger" Data="{StaticResource Icon.Trash}" Width="12" Height="12"/>
+                  </Button>
+                </Grid>
+              </Border>
+            </DataTemplate>
+
+          </ItemsControl.DataTemplates>
+        </ItemsControl>
+      </ScrollViewer>
+
+      <TextBlock IsVisible="{Binding IsEmpty}"
+                 Text="{loc:Tr notes.emptyHint}"
+                 Foreground="{DynamicResource TextMuteBrush}"
+                 MaxWidth="260" TextAlignment="Center" TextWrapping="Wrap"
+                 HorizontalAlignment="Center" VerticalAlignment="Center"
+                 IsHitTestVisible="False"/>
+    </Panel>
   </DockPanel>
 </UserControl>