[CmdPal] MinWidth/Height and DPI-aware launch dimensions (#38637)

* MinWidth/Height and DPI-aware launch dimensions

* Making MainWindow DPI aware too

* Moving toastwindow to WinUIEx too

* Update MainWindow.xaml.cs

* Reverting back to the working logic

* Localizing settings window title

* Xaml formatting

* Update SettingsWindow.xaml.cs

src/modules/cmdpal/Microsoft.CmdPal.UI/Settings/SettingsWindow.xaml

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8" ?>
-<Window
+<winuiex:WindowEx
     x:Class="Microsoft.CmdPal.UI.Settings.SettingsWindow"
     xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
@@ -7,13 +7,18 @@
     xmlns:local="using:Microsoft.CmdPal.UI.Settings"
     xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
     xmlns:ui="using:CommunityToolkit.WinUI"
+    xmlns:winuiex="using:WinUIEx"
     Title="SettingsWindow"
+    Width="1280"
+    Height="720"
+    MinWidth="480"
+    MinHeight="480"
     Activated="Window_Activated"
     Closed="Window_Closed"
     mc:Ignorable="d">
-    <Window.SystemBackdrop>
+    <winuiex:WindowEx.SystemBackdrop>
         <MicaBackdrop />
-    </Window.SystemBackdrop>
+    </winuiex:WindowEx.SystemBackdrop>
     <Grid>
         <Grid.RowDefinitions>
             <RowDefinition Height="Auto" />
@@ -37,10 +42,10 @@
                 Height="16"
                 Source="ms-appx:///Assets/icon.svg" />
             <TextBlock
+                x:Uid="CmdPalSettingsHeader"
                 Margin="12,0,0,0"
                 VerticalAlignment="Center"
-                Style="{StaticResource CaptionTextBlockStyle}"
-                Text="Command Palette Settings" />
+                Style="{StaticResource CaptionTextBlockStyle}" />
         </StackPanel>
         <NavigationView
             x:Name="NavView"
@@ -100,4 +105,4 @@
             </Grid>
         </NavigationView>
     </Grid>
-</Window>
+</winuiex:WindowEx>