branding: replace llama logo assets with new ytLlive branded icons

- Removed llama-logo.ico, llama-logo.png, llama-logo-icon.png
- Added tyllive-icon.png (340x318, app icon for all windows + About overlay)
- Added tyllive-icon.ico (multi-size 16/32/48/256, Windows app icon)
- Updated ytLlive-logo.png to new 524x220 branded version with tagline
- Updated ytLive.csproj + all 6 XAML window references

MainWindow.xaml

@@ -9,7 +9,7 @@
         mc:Ignorable="d"
         Title="{Binding WindowTitle}" Height="720" Width="1280"
         MinWidth="1180" MinHeight="600"
-        Icon="/ytLive;component/Assets/llama-logo-icon.png"
+        Icon="/ytLive;component/Assets/tyllive-icon.png"
         Background="#1a1a2e"
         WindowStartupLocation="CenterScreen"
         Closing="MainWindow_Closing"
@@ -1256,7 +1256,7 @@
 
                         <!-- Hub view -->
                         <StackPanel Visibility="{Binding IsLicensesOpen, Converter={StaticResource InverseBoolToVis}}">
-                            <Image Source="/ytLive;component/Assets/llama-logo.png" Height="140" Stretch="Uniform"
+                            <Image Source="/ytLive;component/Assets/tyllive-icon.png" Height="140" Stretch="Uniform"
                                    HorizontalAlignment="Center" Margin="0,0,0,12"/>
                             <TextBlock Text="ytLlive" FontSize="22" FontWeight="Bold" Foreground="#e94560"
                                        HorizontalAlignment="Center"/>