feat(ui): move review feedback to the Output tab + review/worktree polish

- Feedback box + a new "Resume session" button move from the Git tab to the
  Output tab; the Git review block keeps Approve & Merge / Park / Cancel / Reset.
- Add a "Parked" chip for Idle tasks that still hold an Active worktree.
- Stop showing the "Session was Cancelled" band on cancel (failed-only now).
- Fix the Worktrees-overview state-chip contrast (dark text on the colour).

src/ClaudeDo.Ui/Design/IslandStyles.axaml

@@ -229,6 +229,15 @@
     <Setter Property="Foreground" Value="{StaticResource TextMuteBrush}" />
   </Style>
 
+  <!-- parked → slate-blue: an Idle task still holding its Active worktree -->
+  <Style Selector="Border.chip.parked">
+    <Setter Property="Background"  Value="#22303A" />
+    <Setter Property="BorderBrush" Value="#3A5060" />
+  </Style>
+  <Style Selector="Border.chip.parked > TextBlock">
+    <Setter Property="Foreground" Value="#8FB9D6" />
+  </Style>
+
   <!-- ============================================================ -->
   <!-- BUTTONS                                                      -->
   <!-- ============================================================ -->