feat(ui): Interactive chip for tasks with an open ConPTY session

A task driven by hand in Mission Control is Idle with an Active worktree, so its
lifecycle chip read "Parked" — indistinguishable from a task genuinely set aside.
The shell now mirrors Mission Control's open panes onto the rows, which show an
accent "Interactive" chip instead; tapping it surfaces Mission Control and
focuses that pane (the open command already dedupes by task id).

src/ClaudeDo.Ui/Design/IslandStyles.axaml

@@ -247,6 +247,21 @@
     <Setter Property="Foreground" Value="#8FB9D6" />
   </Style>
 
+  <!-- interactive → accent, the "live" family shared with running: the task has a ConPTY session
+       open in Mission Control. Clickable (jumps to that pane), hence the hand cursor + hover lift.
+       Deliberately NOT the slate-blue parked treatment — telling the two apart is the whole point. -->
+  <Style Selector="Border.chip.interactive">
+    <Setter Property="Background"  Value="{StaticResource RunningTintBrush}" />
+    <Setter Property="BorderBrush" Value="{StaticResource AccentBrush}" />
+    <Setter Property="Cursor"      Value="Hand" />
+  </Style>
+  <Style Selector="Border.chip.interactive > TextBlock">
+    <Setter Property="Foreground" Value="{StaticResource AccentBrush}" />
+  </Style>
+  <Style Selector="Border.chip.interactive:pointerover">
+    <Setter Property="Background" Value="{StaticResource AccentSoftBrush}" />
+  </Style>
+
   <!-- Worktree-state chips (worktrees overview) -->
   <!-- active → slate-blue (same hue as parked: a live worktree) -->
   <Style Selector="Border.chip.wt-active">