feat: redesign Pump page with Fluent card layout, bottom snackbar, and RPM chart

- Replace sub-nav + HiddenTabsTabControl with 3-column Fluent card layout:
  PumpCommandsCard (vertical ME/FBKW/PreIn sliders) + DfiCalibrationCard /
  PumpLiveDataCard (KPI tiles + RPM rolling chart + redesigned status bytes) /
  PumpIdentificationCard + DtcCard
- Add PumpTopStripView: pump selector, model badge, CAN + K-Line chips
- Move immobilizer unlock to MainWindow bottom snackbar (UnlockSnackbarView):
  auto-close on success after 3 s, persist on failure with manual Dismiss
- Redesign StatusDisplayView to 2×8 rounded 28px tiles with bit index + tooltip
- Add NullToVisibilityConverter; add SnackbarShell, PumpCard, and related styles
- Delete obsolete views: UnlockProgressDialog, UnlockPanelView,
  PumpIdentificationPanelView, PumpLiveDataView, DfiManageView,
  DtcListView, PumpControlView
- PumpPageViewModel: remove PumpSubPage enum, add RpmChart wired to Root.PumpRpm

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

MainWindow.xaml

@@ -123,10 +123,12 @@
 
         <!-- ── Main content: left navigation rail + hidden-tab page host ──── -->
         <Grid>
-            <Grid.ColumnDefinitions>
-                <ColumnDefinition Width="180"/>
-                <ColumnDefinition Width="*"/>
-            </Grid.ColumnDefinitions>
+            <!-- Inner grid: nav rail (col 0) + page host (col 1) -->
+            <Grid>
+                <Grid.ColumnDefinitions>
+                    <ColumnDefinition Width="180"/>
+                    <ColumnDefinition Width="*"/>
+                </Grid.ColumnDefinitions>
 
             <!--
                 Nav rail column: primary pages at top, Settings pinned at bottom
@@ -208,6 +210,11 @@
                     <pages:ResultsPage DataContext="{Binding ResultsPage}"/>
                 </TabItem>
             </TabControl>
+            </Grid>
+            <uc:UnlockSnackbarView DataContext="{Binding CurrentUnlockVm}"
+                                   HorizontalAlignment="Center"
+                                   VerticalAlignment="Bottom"
+                                   Margin="0,0,0,8"/>
         </Grid>
     </DockPanel>
 </ui:FluentWindow>