feat: add AngleDisplay MVVM UserControl for advance monitoring

Refactors the old AngleDisplay code-behind into a clean MVVM implementation
with AngleDisplayViewModel (PSG/INJ/Manual encoder angles, zero references,
lock angle calculation with tolerance color coding) and a pure XAML view.
Wires LockAngleFaseReady and PsgModeFaseReady test phase events.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

MainWindow.xaml

@@ -112,6 +112,7 @@
                             <RowDefinition Height="Auto"/> <!-- Row 1: CAN buttons -->
                             <RowDefinition Height="Auto"/> <!-- Row 2: two-column info + controls -->
                             <RowDefinition Height="Auto"/> <!-- Row 3: flowmeter charts -->
+                            <RowDefinition Height="Auto"/> <!-- Row 4: angle display -->
                         </Grid.RowDefinitions>
 
                         <!-- ── Row 0: Connection status indicators ─────────────── -->
@@ -430,6 +431,10 @@
                             <uc:FlowmeterChartView DataContext="{Binding FlowmeterChart.Over}" Margin="0,4,0,0"/>
                         </StackPanel>
 
+                        <!-- ── Row 4: Advance monitoring (encoder angles) ─────── -->
+                        <uc:AngleDisplayView Grid.Row="4" Margin="0,4"
+                                             DataContext="{Binding AngleDisplay}"/>
+
                     </Grid>
                 </ScrollViewer>
             </Expander>