feat(tasks): mark tasks and lists as manual

Reminders written down as todos had no home: every task looked like Claude work.
A manual task now shows a MANUAL badge and hides send-to-queue, refine and the
planning session; the queue picker, daily prep and the list handler all skip it,
with a TaskStateService guard so the MCP surface and hub cannot start one either.
Opening a hand-driven ConPTY session stays available on purpose.

A list can be marked manual in its settings, which makes tasks created there
(UI and MCP add_task) start out manual. Toggle per task from its context menu.

src/ClaudeDo.Ui/Views/Modals/ListSettingsModalView.axaml

@@ -60,6 +60,13 @@
                           SelectedItem="{Binding DefaultCommitType, Mode=TwoWay}"
                           HorizontalAlignment="Left" MinWidth="160" />
               </StackPanel>
+
+              <StackPanel Spacing="4">
+                <CheckBox IsChecked="{Binding IsManual, Mode=TwoWay}"
+                          Content="{loc:Tr modals.listSettings.manualList}"/>
+                <TextBlock Text="{loc:Tr modals.listSettings.manualListHint}"
+                           Opacity="0.6" FontSize="12" TextWrapping="Wrap"/>
+              </StackPanel>
             </StackPanel>
           </Border>
         </StackPanel>