fix(notes): Shift+Enter in the capture box, not just in the note rows

The previous fix put AcceptsReturn on the rows in the DataTemplate and
missed the box you actually type new notes into, which still had it off
and only a KeyBinding for Enter — so Shift+Enter there did nothing.

Both now go through the same tunnel handler: Enter files the note,
Shift+Enter is left to the TextBox for the line break. The KeyBinding is
gone; with AcceptsReturn on it could never have fired anyway, because
TextBox consumes Enter in its own OnKeyDown before bindings or bubbling
handlers run.

Verified against the running app: a note typed with Shift+Enter is
stored as "fe\r\ndwa".

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

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

@@ -45,14 +45,14 @@
           <PathIcon Width="12" Height="12" Data="{StaticResource Icon.Plus}"
                     Foreground="{DynamicResource TextFaintBrush}"/>
         </Border>
+        <!-- Enter/Shift+Enter are handled in the code-behind's tunnel handler, same as the note
+             rows: a KeyBinding would never fire, because AcceptsReturn makes TextBox consume
+             Enter first. -->
         <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>
+                 AcceptsReturn="True" TextWrapping="Wrap"
+                 VerticalAlignment="Center" Margin="12,0,0,0"/>
         <Border Grid.Column="2" Classes="kbd kbd-enter" VerticalAlignment="Center"
                 IsVisible="{Binding #NewNoteBox.IsFocused}">
           <TextBlock Text="{loc:Tr tasks.enterKey}"/>