fix: replace hardcoded sizes in MultiImageCaptureSample with design tokens

Agent-Logs-Url: https://github.com/DIPSAS/DIPS.Mobile.UI/sessions/0b8cb90d-a1f6-417b-94f6-1fb46da4eb83

Co-authored-by: VegardHV <71251242+VegardHV@users.noreply.github.com>

Author: Copilot

src/app/Components/ComponentsSamples/ImageCapturing/MultiImageCaptureSample.xaml

@@ -12,12 +12,12 @@
         <Grid x:Name="SelectionView"
               RowDefinitions="Auto,Auto,Auto"
               VerticalOptions="Center"
-              Padding="16"
-              RowSpacing="12">
-            <Label Grid.Row="0"
-                   Text="Choose mode to test"
-                   HorizontalTextAlignment="Center"
-                   FontSize="18" />
+              Padding="{dui:Sizes size_4}"
+              RowSpacing="{dui:Sizes size_3}">
+            <dui:Label Grid.Row="0"
+                       Text="Choose mode to test"
+                       HorizontalTextAlignment="Center"
+                       Style="{dui:Styles Label=SectionHeader}" />
             <Button Grid.Row="1"
                     x:Name="StartWithoutConfirmationButton"
                     Text="Without confirmation"
@@ -30,19 +30,19 @@
         <Grid x:Name="ResultView"
               IsVisible="False"
               RowDefinitions="Auto,*,Auto"
-              Padding="16">
-            <Label x:Name="ResultLabel"
-                   HorizontalTextAlignment="Center"
-                   FontSize="18"
-                   Margin="0,8" />
+              Padding="{dui:Sizes size_4}">
+            <dui:Label x:Name="ResultLabel"
+                       HorizontalTextAlignment="Center"
+                       Style="{dui:Styles Label=SectionHeader}"
+                       Margin="{dui:Thickness Top=size_2, Bottom=size_2}" />
             <ScrollView Grid.Row="1">
                 <VerticalStackLayout x:Name="ImageList"
-                                     Spacing="12" />
+                                     Spacing="{dui:Sizes size_3}" />
             </ScrollView>
             <Button Grid.Row="2"
                     Text="{x:Static localizedStrings:DUILocalizedStrings.Close}"
                     Clicked="OnCloseClicked"
-                    Margin="0,8,0,0" />
+                    Margin="{dui:Thickness Top=size_2}" />
         </Grid>
     </Grid>