fix(ui): wire delete confirm, close-details, uppercase eyebrow, explorer button

- A1: list-name eyebrow runs through UpperCase converter.
- D2: + Open-in-explorer icon button in AgentStrip (Process.Start on worktree path).
- D4: DeleteTaskCommand prompts inline confirm Window before deleting; shell
  wires Details.CloseDetail to clear Tasks.SelectedTask and Details.DeleteFromList
  to reload the current list.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/ClaudeDo.Ui/Views/MainWindow.axaml

@@ -46,7 +46,7 @@
                      Foreground="{DynamicResource TextFaintBrush}"
                      VerticalAlignment="Center"/>
           <!-- current list name -->
-          <TextBlock Text="{Binding Lists.SelectedList.Name}"
+          <TextBlock Text="{Binding Lists.SelectedList.Name, Converter={StaticResource UpperCase}}"
                      FontFamily="{DynamicResource MonoFont}"
                      FontSize="11"
                      Foreground="{DynamicResource TextDimBrush}"