Refine UI layout in PLib video library manager by adjusting MainWindow and SettingsView for a more cohesive design. Implement dedicated styles for panel headers and footers, ensuring consistent visual hierarchy. Update README.md to document these layout enhancements and style changes.

README.md

@@ -67,8 +67,9 @@ dotnet test
   сдвигает сетку, и та переливается в меньшее число столбцов, оставаясь целиком доступной.
   В alt-tab ничего не добавляется, и приложение остаётся переносимым на
   `ISingleViewApplicationLifetime`, где `ShowDialog` попросту не существует.
-  Верхняя и нижняя полосы обеих половин заданы одной парой стилей, поэтому разделители
-  читаются как сплошные линии через всё окно.
+  Панель занимает только строку контента: шапка и статус-бар остаются цельными на всю
+  ширину окна. Собственные заголовок и строка действий у панели заведомо легче оконных —
+  равные по весу читались как два приложения, сшитых по шву.
 - **Настройки — рабочая копия.** Панель правит снимок `AppSettings` и записывает его целиком
   только по «Сохранить», так что отмена не оставляет следов. Пересканирование запускается
   только если изменилось то, что влияет на состав библиотеки, — смена темы или ширины кадра

src/PLib.Desktop/Themes/LibraryStyles.axaml

@@ -127,6 +127,30 @@
     <Setter Property="BorderThickness" Value="0,1,0,0" />
   </Style>
 
+  <!--
+    The panel's own header and action row. Deliberately lighter than the window bars above:
+    they belong to a region inside the content, and giving them the same weight made the two
+    halves read as two applications stitched together.
+  -->
+  <Style Selector="Border.panelHeader">
+    <Setter Property="Padding" Value="16,13" />
+    <Setter Property="BorderBrush" Value="{DynamicResource SurfaceBorderBrush}" />
+    <Setter Property="BorderThickness" Value="0,0,0,1" />
+  </Style>
+
+  <Style Selector="Border.panelFooter">
+    <Setter Property="Padding" Value="16,12" />
+    <Setter Property="BorderBrush" Value="{DynamicResource SurfaceBorderBrush}" />
+    <Setter Property="BorderThickness" Value="0,1,0,0" />
+  </Style>
+
+  <Style Selector="TextBlock.panelTitle">
+    <Setter Property="Foreground" Value="{DynamicResource TextPrimaryBrush}" />
+    <Setter Property="FontSize" Value="14" />
+    <Setter Property="FontWeight" Value="SemiBold" />
+    <Setter Property="VerticalAlignment" Value="Center" />
+  </Style>
+
   <!-- ======================== Settings panel ======================== -->
 
   <!--
@@ -138,14 +162,11 @@
   <Style Selector="Border.settingsPanel">
     <Setter Property="Width" Value="0" />
     <Setter Property="ClipToBounds" Value="True" />
-    <!--
-      Its own backdrop and a stronger divider than the usual surface border: once the bars on
-      both sides line up, a hairline in the ordinary border colour reads as one continuous
-      bar and the panel stops looking like a separate region.
-    -->
+    <!-- Its own backdrop, so the panel reads as a separate region even where the bars on
+         both sides share a colour. The divider itself is a sibling element, not this
+         border: a border belongs to the panel and is only as visible as the panel's own
+         background, whereas the separation has to hold across the bars too. -->
     <Setter Property="Background" Value="{DynamicResource PanelBackgroundBrush}" />
-    <Setter Property="BorderBrush" Value="{DynamicResource PanelDividerBrush}" />
-    <Setter Property="BorderThickness" Value="1,0,0,0" />
     <Setter Property="Transitions">
       <Transitions>
         <DoubleTransition Property="Width" Duration="0:0:0.22" Easing="CubicEaseOut" />
@@ -157,6 +178,16 @@
     <Setter Property="Width" Value="400" />
   </Style>
 
+  <!--
+    Drawn after the panel and over both bars, so nothing can paint across it. This is the
+    one line that tells the eye where the library ends and the settings begin.
+  -->
+  <Style Selector="Rectangle.panelDivider">
+    <Setter Property="Width" Value="1" />
+    <Setter Property="HorizontalAlignment" Value="Left" />
+    <Setter Property="Fill" Value="{DynamicResource PanelDividerBrush}" />
+  </Style>
+
   <!-- ============================ Badge ============================ -->
 
   <Style Selector="Border.badge">

src/PLib.Desktop/Views/MainWindow.axaml

@@ -9,7 +9,7 @@
         Title="PLib — видеотека"
         Width="1180"
         Height="760"
-        MinWidth="1000"
+        MinWidth="900"
         MinHeight="420"
         Background="{DynamicResource PageBackgroundBrush}"
         WindowStartupLocation="CenterScreen">
@@ -95,9 +95,7 @@
 
   </Window.Resources>
 
-  <Grid ColumnDefinitions="*,Auto">
-
-   <Grid Grid.Column="0" RowDefinitions="Auto,*,Auto">
+  <Grid RowDefinitions="Auto,*,Auto">
 
     <!-- ======================= Header ======================= -->
     <Border Grid.Row="0" Classes="appBar">
@@ -153,10 +151,7 @@
             <icons:MaterialIcon Kind="CogOutline" Width="17" Height="17" />
           </Button>
 
-          <!-- Redundant while the panel is open, and the header needs the room there. -->
-          <Button Classes="Primary"
-                  Command="{Binding AddFolderCommand}"
-                  IsVisible="{Binding !IsSettingsOpen}">
+          <Button Classes="Primary" Command="{Binding AddFolderCommand}">
             <StackPanel Orientation="Horizontal" Spacing="7">
               <icons:MaterialIcon Kind="FolderPlusOutline" Width="17" Height="17" />
               <TextBlock Text="Добавить папку" />
@@ -167,8 +162,10 @@
       </Grid>
     </Border>
 
-    <!-- ======================= Grid ======================= -->
-    <Panel Grid.Row="1">
+    <!-- =================== Library and settings =================== -->
+    <Grid Grid.Row="1" ColumnDefinitions="*,Auto">
+
+     <Panel Grid.Column="0">
 
       <ScrollViewer Padding="20,18" HorizontalScrollBarVisibility="Disabled">
         <ItemsRepeater ItemsSource="{Binding Videos}" ItemTemplate="{StaticResource VideoCardTemplate}">
@@ -210,6 +207,18 @@
 
      </Panel>
 
+     <!-- The panel is a column of the content row, so the bars above and below it stay
+          whole: one header and one status bar belonging to the window, not two of each. -->
+     <Border Grid.Column="1" Classes="settingsPanel" Classes.open="{Binding IsSettingsOpen}">
+       <ContentControl Width="400"
+                       Content="{Binding SettingsPanel}"
+                       ContentTemplate="{StaticResource SettingsTemplate}" />
+     </Border>
+
+     <Rectangle Grid.Column="1" Classes="panelDivider" IsVisible="{Binding IsSettingsOpen}" />
+
+    </Grid>
+
     <!-- ======================= Status bar ======================= -->
     <Border Grid.Row="2" Classes="statusBar">
       <Grid ColumnDefinitions="Auto,*,Auto" ColumnSpacing="14">
@@ -238,13 +247,4 @@
     </Border>
 
   </Grid>
-
-    <!-- ======================= Settings panel ======================= -->
-    <Border Grid.Column="1" Classes="settingsPanel" Classes.open="{Binding IsSettingsOpen}">
-      <ContentControl Width="400"
-                      Content="{Binding SettingsPanel}"
-                      ContentTemplate="{StaticResource SettingsTemplate}" />
-    </Border>
-
-  </Grid>
 </Window>

src/PLib.Desktop/Views/SettingsView.axaml

@@ -31,34 +31,20 @@
   <Grid RowDefinitions="Auto,*,Auto">
 
     <!-- ======================= Header ======================= -->
-    <Border Grid.Row="0" Classes="appBar">
-      <Grid ColumnDefinitions="Auto,*,Auto">
-        <Border Grid.Column="0"
-                Width="32"
-                Height="32"
-                CornerRadius="9"
-                Background="{DynamicResource AccentSoftBrush}">
-          <icons:MaterialIcon Kind="CogOutline"
-                              Width="18"
-                              Height="18"
-                              Foreground="{DynamicResource AccentBrush}" />
-        </Border>
-        <TextBlock Grid.Column="1"
-                   Classes="sectionTitle"
-                   Margin="10,0,0,0"
-                   Text="Настройки"
-                   VerticalAlignment="Center" />
-        <Button Grid.Column="2"
+    <Border Grid.Row="0" Classes="panelHeader">
+      <Grid ColumnDefinitions="*,Auto">
+        <TextBlock Grid.Column="0" Classes="panelTitle" Text="Настройки" />
+        <Button Grid.Column="1"
                 Command="{Binding CancelCommand}"
-                Padding="7"
+                Padding="6"
                 ToolTip.Tip="Закрыть без сохранения">
-          <icons:MaterialIcon Kind="Close" Width="15" Height="15" />
+          <icons:MaterialIcon Kind="Close" Width="14" Height="14" />
         </Button>
       </Grid>
     </Border>
 
     <!-- ======================= Body ======================= -->
-    <ScrollViewer Grid.Row="1" Padding="20,18">
+    <ScrollViewer Grid.Row="1" Padding="16,14">
       <StackPanel Spacing="14">
 
         <!-- Folders -->
@@ -223,7 +209,7 @@
     </ScrollViewer>
 
     <!-- ======================= Footer ======================= -->
-    <Border Grid.Row="2" Classes="statusBar">
+    <Border Grid.Row="2" Classes="panelFooter">
       <Grid ColumnDefinitions="*,Auto" ColumnSpacing="14">
         <TextBlock Grid.Column="0"
                    Classes="hint"