fix: enforce deep dark backgrounds on UserControls and inject explicit DataGrid/ComboBox templates to eliminate white backgrounds

Views/ActiveDirectoryView.xaml

@@ -1,5 +1,6 @@
 <UserControl xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
-             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             Background="{StaticResource BgDarkBrush}">
     <Grid Margin="24">
         <Grid.RowDefinitions>
             <RowDefinition Height="Auto" />

Views/DashboardView.xaml

@@ -1,5 +1,6 @@
 <UserControl xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
-             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             Background="{StaticResource BgDarkBrush}">
     <Grid Margin="24">
         <Grid.RowDefinitions>
             <RowDefinition Height="Auto" />

Views/NetAppView.xaml

@@ -1,5 +1,6 @@
 <UserControl xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
-             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             Background="{StaticResource BgDarkBrush}">
     <Grid Margin="24">
         <Grid.RowDefinitions>
             <RowDefinition Height="Auto" />

Views/SettingsView.xaml

@@ -1,5 +1,6 @@
 <UserControl xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
-             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             Background="{StaticResource BgDarkBrush}">
     <Grid Margin="24">
         <Grid.RowDefinitions>
             <RowDefinition Height="Auto" />

Views/ShareAccessManagerView.xaml

@@ -1,5 +1,6 @@
 <UserControl xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
-             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             Background="{StaticResource BgDarkBrush}">
     <Grid Margin="24">
         <Grid.RowDefinitions>
             <!-- 0. Header -->

Views/SqlDatabaseView.xaml

@@ -1,5 +1,6 @@
 <UserControl xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
-             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             Background="{StaticResource BgDarkBrush}">
     <Grid Margin="24">
         <Grid.RowDefinitions>
             <RowDefinition Height="Auto" />