Fix UI polish: scrollbar deselect, web source inline buttons, countdown in Sources, volume click-to-position, meter decay

- Elements scrollbar no longer deselects element on click (check ScrollViewer, not StackPanel)
- Web source: URI + check/revert buttons merged into single DockPanel row, consistent order (✓ rightmost)
- Countdown timer moved from Elements panel to inline in source list row, range clamped to 1-30 min
- Volume slider click-to-position restored: e.Handled prevents IncreaseLarge from overriding position, Thumb drag still works
- Desktop audio meter: asymmetric smoothing (attack 0.2, decay 0.08) for faster response to silence
- 207 tests passing, 0 warnings

MainWindow.xaml

@@ -278,6 +278,10 @@
                         <ListBox.ItemTemplate>
                             <DataTemplate>
                                 <Grid Margin="0,2">
+                                    <Grid.RowDefinitions>
+                                        <RowDefinition Height="Auto"/>
+                                        <RowDefinition Height="Auto"/>
+                                    </Grid.RowDefinitions>
                                     <Grid.ColumnDefinitions>
                                         <ColumnDefinition Width="*"/>
                                         <ColumnDefinition Width="Auto"/>
@@ -297,7 +301,7 @@
                                         </ContextMenu>
                                     </Grid.ContextMenu>
 
-                                    <TextBlock Grid.Column="0" Text="{Binding Name}" VerticalAlignment="Center"
+                                    <TextBlock Grid.Row="0" Grid.Column="0" Text="{Binding Name}" VerticalAlignment="Center"
                                                Padding="4,2" TextTrimming="CharacterEllipsis">
                                         <TextBlock.Style>
                                             <Style TargetType="TextBlock">
@@ -311,7 +315,7 @@
                                         </TextBlock.Style>
                                     </TextBlock>
 
-                                    <TextBox Grid.Column="0" Text="{Binding Name, UpdateSourceTrigger=PropertyChanged}"
+                                    <TextBox Grid.Row="0" Grid.Column="0" Text="{Binding Name, UpdateSourceTrigger=PropertyChanged}"
                                              Background="#0f3460" Foreground="#e0e0e0" BorderThickness="0"
                                              Padding="4,2" VerticalContentAlignment="Center"
                                              IsVisibleChanged="SourceNameBox_IsVisibleChanged"
@@ -328,27 +332,38 @@
                                         </TextBox.Style>
                                     </TextBox>
 
-                                    <Button Grid.Column="1" ToolTip="Edit Source Name"
+                                    <Button Grid.Row="0" Grid.Column="1" ToolTip="Edit Source Name"
                                             Command="{Binding DataContext.EditElementCommand, RelativeSource={RelativeSource AncestorType=ListBox}}"
                                             CommandParameter="{Binding}" Style="{StaticResource IconButton}">
                                         <Path Data="M3,17.25V21h3.75L17.81,9.94l-3.75,-3.75L3,17.25zM20.71,7.04c0.39,-0.39 0.39,-1.02 0,-1.41l-2.34,-2.34c-0.39,-0.39 -1.02,-0.39 -1.41,0l-1.83,1.83 3.75,3.75 1.83,-1.83z"
                                               Fill="#d0d0d0" Width="13" Height="13" Stretch="Uniform"/>
                                     </Button>
 
-                                    <Button Grid.Column="2" Style="{StaticResource EyeButton}"
+                                    <Button Grid.Row="0" Grid.Column="2" Style="{StaticResource EyeButton}"
                                             Command="{Binding DataContext.ToggleElementVisibilityCommand, RelativeSource={RelativeSource AncestorType=ListBox}}"
                                             CommandParameter="{Binding}">
                                         <Path Style="{StaticResource EyeIconStyle}" Fill="#d0d0d0"
                                               Width="13" Height="13" Stretch="Uniform"/>
                                     </Button>
 
-                                    <Button Grid.Column="3" ToolTip="Remove Source"
+                                    <Button Grid.Row="0" Grid.Column="3" ToolTip="Remove Source"
                                             Command="{Binding DataContext.RemoveSourceCommand, RelativeSource={RelativeSource AncestorType=ListBox}}"
                                             CommandParameter="{Binding}" Style="{StaticResource IconButton}"
                                             Visibility="{Binding IsBackdrop, Converter={StaticResource HiddenBoolToVis}}">
                                         <Path Data="M6,19c0,1.1 0.9,2 2,2h8c1.1,0 2,-0.9 2,-2V7H6v12zM19,4h-3.5l-1,-1h-5l-1,1H5v2h14V4z"
                                               Fill="#d0d0d0" Width="13" Height="13" Stretch="Uniform"/>
                                     </Button>
+
+                                    <!-- Countdown timer: inline in source list row 1 -->
+                                    <DockPanel Grid.Row="1" Grid.ColumnSpan="4" Margin="8,2,4,2"
+                                               Visibility="{Binding Type, Converter={StaticResource SourceTypeToCountdownVis}, ConverterParameter=Countdown}">
+                                        <TextBlock Text="{Binding TimerMinutes, StringFormat={}{0} min}" Foreground="#a0a0b0" FontSize="11"
+                                                   DockPanel.Dock="Right" VerticalAlignment="Center" Margin="6,0,0,0" Width="42"/>
+                                        <Slider DockPanel.Dock="Left" Width="130" Minimum="1" Maximum="30"
+                                                Value="{Binding TimerMinutes, Mode=TwoWay}"
+                                                VerticalAlignment="Center" TickFrequency="1" IsSnapToTickEnabled="True"
+                                                Style="{StaticResource CompactSlider}"/>
+                                    </DockPanel>
                                 </Grid>
                             </DataTemplate>
                         </ListBox.ItemTemplate>
@@ -366,7 +381,7 @@
                                 Visibility="{Binding SelectedElement, Converter={StaticResource NotNullToVis}}">
                         <TextBlock Text="ELEMENTS" Style="{StaticResource SectionHeader}" VerticalAlignment="Center"/>
                     </StackPanel>
-                    <ScrollViewer Grid.Row="7" VerticalScrollBarVisibility="Auto" Background="Transparent"
+                    <ScrollViewer x:Name="ElementsScrollViewer" Grid.Row="7" VerticalScrollBarVisibility="Auto" Background="Transparent"
                                   Visibility="{Binding SelectedElement, Converter={StaticResource NotNullToVis}}">
                         <StackPanel x:Name="ElementsPanel" Margin="0,4,0,0">
                             <!-- Opacity + mirror/shape (draggable elements: image, webcam) -->
@@ -425,48 +440,25 @@
                                 </DockPanel>
                             </StackPanel>
 
-                            <!-- Countdown config -->
+                            <!-- Web source config -->
-                            <StackPanel Visibility="{Binding SelectedElement.Type, Converter={StaticResource SourceTypeToCountdownVis}, ConverterParameter=Countdown}" Margin="0,0,0,8">
+                            <StackPanel Visibility="{Binding SelectedElement.Type, Converter={StaticResource SourceTypeToWebVis}, ConverterParameter=WebSource}" Margin="0,0,0,8">
-                                <TextBlock Text="Timer (minutes)" Foreground="#a0a0b0" FontSize="11" Margin="0,0,0,2"/>
+                                <TextBlock Text="URI" Foreground="#a0a0b0" FontSize="11" Margin="0,0,0,2"/>
-                                <DockPanel Margin="0,0,0,6">
+                                <DockPanel>
-                                    <Button DockPanel.Dock="Right" Style="{StaticResource IconButton}"
-                                            Width="22" Height="22" ToolTip="Revert"
-                                            Click="CountdownRevert_Click" Margin="4,0,0,0">
-                                        <Path Data="M5,5 L15,15 M15,5 L5,15" Stroke="#e94560" StrokeThickness="2"
-                                              Width="14" Height="14" Stretch="Uniform"/>
-                                    </Button>
                                     <Button DockPanel.Dock="Right" Style="{StaticResource IconButton}"
                                             IsEnabled="False" Width="22" Height="22" Margin="4,0,0,0">
                                         <Path Data="M4,9 L8,14 L16,4" Stroke="#22c55e" StrokeThickness="2"
                                               Width="14" Height="14" Stretch="Uniform"/>
                                     </Button>
-                                    <Slider DockPanel.Dock="Left" Width="120" Minimum="1" Maximum="60"
-                                            Value="{Binding SelectedElement.TimerMinutes, Mode=TwoWay}"
-                                            VerticalAlignment="Center" TickFrequency="1" IsSnapToTickEnabled="True"/>
-                                    <TextBlock Text="{Binding SelectedElement.TimerMinutes}" Foreground="#a0a0b0" FontSize="11"
-                                               VerticalAlignment="Center" Margin="8,0,0,0" Width="20"/>
-                                </DockPanel>
-                            </StackPanel>
-
-                            <!-- Web source config -->
-                            <StackPanel Visibility="{Binding SelectedElement.Type, Converter={StaticResource SourceTypeToWebVis}, ConverterParameter=WebSource}" Margin="0,0,0,8">
-                                <TextBlock Text="URI" Foreground="#a0a0b0" FontSize="11" Margin="0,0,0,2"/>
-                                <TextBox Text="{Binding SelectedElement.WebUri, UpdateSourceTrigger=PropertyChanged}"
-                                         Background="#0f3460" Foreground="#e0d0e0" BorderThickness="1"
-                                         BorderBrush="#2c3a5c" Padding="4,2" FontSize="12"
-                                         ToolTip="https://example.com"/>
-                                <DockPanel Margin="0,4,0,0">
                                     <Button DockPanel.Dock="Right" Style="{StaticResource IconButton}"
                                             Width="22" Height="22" ToolTip="Revert"
                                             Click="WebRevert_Click" Margin="4,0,0,0">
                                         <Path Data="M5,5 L15,15 M15,5 L5,15" Stroke="#e94560" StrokeThickness="2"
                                               Width="14" Height="14" Stretch="Uniform"/>
                                     </Button>
-                                    <Button DockPanel.Dock="Right" Style="{StaticResource IconButton}"
+                                    <TextBox Text="{Binding SelectedElement.WebUri, UpdateSourceTrigger=PropertyChanged}"
-                                            IsEnabled="False" Width="22" Height="22" Margin="4,0,0,0">
+                                             Background="#0f3460" Foreground="#e0d0e0" BorderThickness="1"
-                                        <Path Data="M4,9 L8,14 L16,4" Stroke="#22c55e" StrokeThickness="2"
+                                             BorderBrush="#2c3a5c" Padding="4,2" FontSize="12"
-                                              Width="14" Height="14" Stretch="Uniform"/>
+                                             ToolTip="https://example.com"/>
-                                    </Button>
                                 </DockPanel>
                             </StackPanel>
 

MainWindow.xaml.cs

@@ -83,8 +83,11 @@ public partial class MainWindow : Window
 
     private void VolumeSlider_PreviewMouseLeftButtonDown(object sender, MouseButtonEventArgs e)
     {
-        if (sender is Slider slider)
+        if (sender is Slider slider && ClickIsOnTrackBackground(slider, e))
+        {
             SetSliderValueFromClick(slider, e);
+            e.Handled = true;
+        }
         if (sender is FrameworkElement { DataContext: MainViewModel vm })
             vm.SetVolumeAdjusting(true);
     }
@@ -103,8 +106,11 @@ public partial class MainWindow : Window
 
     private void GameVolumeSlider_PreviewMouseLeftButtonDown(object sender, MouseButtonEventArgs e)
     {
-        if (sender is Slider slider)
+        if (sender is Slider slider && ClickIsOnTrackBackground(slider, e))
+        {
             SetSliderValueFromClick(slider, e);
+            e.Handled = true;
+        }
         if (sender is FrameworkElement { DataContext: MainViewModel vm })
             vm.SetGameVolumeAdjusting(true);
     }
@@ -121,6 +127,15 @@ public partial class MainWindow : Window
             vm.SetGameVolumeAdjusting(false);
     }
 
+    private static bool ClickIsOnTrackBackground(Slider slider, MouseButtonEventArgs e)
+    {
+        var track = slider.Template.FindName("PART_Track", slider) as System.Windows.Controls.Primitives.Track;
+        if (track == null) return false;
+        if (track.Thumb != null && IsDescendantOf(e.OriginalSource as DependencyObject, track.Thumb))
+            return false;
+        return true;
+    }
+
     private static void SetSliderValueFromClick(Slider slider, MouseButtonEventArgs e)
     {
         var track = slider.Template.FindName("PART_Track", slider) as System.Windows.Controls.Primitives.Track;
@@ -209,7 +224,7 @@ public partial class MainWindow : Window
         if (e.OriginalSource is not DependencyObject original) return;
         if (IsDescendantOf(original, PreviewGrid)) return;
         if (IsDescendantOf(original, SourceList)) return;
-        if (IsDescendantOf(original, ElementsPanel)) return;
+        if (IsDescendantOf(original, ElementsScrollViewer)) return;
         _viewModel.SelectedElement = null;
     }
 

Models/Source.cs

@@ -96,7 +96,7 @@ public class Source : SceneElement
     public int TimerMinutes
     {
         get => _timerMinutes;
-        set => Set(ref _timerMinutes, Math.Clamp(value, 1, 60));
+        set => Set(ref _timerMinutes, Math.Clamp(value, 1, 30));
     }
 
     // Web source config

Services/Audio/AudioLevelMeter.cs

@@ -1,18 +1,27 @@
 namespace ytLive.Services.Audio;
 
 /// <summary>
-/// Computes the smoothed mic level (0..1) from captured samples. Pure —
+/// Computes the smoothed level (0..1) from captured samples. Pure —
 /// unit-tested; the <see cref="AudioMixer"/> only feeds it and forwards the
 /// result. RMS-based so it tracks perceived loudness, smoothed so the meter
-/// does not flicker.
+/// does not flicker. Supports asymmetric smoothing: fast attack (rise) and
+/// configurable decay (fall) so the meter responds quickly to silence.
 /// </summary>
 public sealed class AudioLevelMeter
 {
-    private const float Smoothing = 0.2f;
     private float _level;
 
     public float Level => _level;
 
+    public AudioLevelMeter(float attackSmoothing = 0.2f, float decaySmoothing = 0.08f)
+    {
+        AttackSmoothing = attackSmoothing;
+        DecaySmoothing = decaySmoothing;
+    }
+
+    public float AttackSmoothing { get; }
+    public float DecaySmoothing { get; }
+
     /// <summary>
     /// Maps a linear level (0..1) onto the meter's display scale: -60 dBFS..0 dBFS
     /// spread linearly across 0..1, with +10 dB of input amplification. Linear RMS
@@ -44,7 +53,8 @@ public sealed class AudioLevelMeter
         }
 
         var rms = (float)Math.Sqrt(sumSquares / count);
-        _level = _level * (1 - Smoothing) + rms * Smoothing;
+        var smoothing = rms > _level ? AttackSmoothing : DecaySmoothing;
+        _level = _level * (1 - smoothing) + rms * smoothing;
         return _level;
     }
 

Services/Audio/AudioMixer.cs

@@ -57,7 +57,7 @@ public sealed class AudioMixer : IDisposable
         _mic = mic;
         _loopback = loopback;
         _meter = new AudioLevelMeter();
-        _loopbackMeter = new AudioLevelMeter();
+        _loopbackMeter = new AudioLevelMeter(attackSmoothing: 0.2f, decaySmoothing: 0.08f);
         _log = log;
         _micGain = micGain;
         _loopbackGain = loopbackGain;

TASKS.md

@@ -818,12 +818,12 @@ No changes to `MusicPlayer`, the 0.20 cap, the ducker, or the meter zones. Build
 1. ✅ TRAX volume — `LocalGain = GameAudioVolume * 0.2` so TRAX is 20% of the desktop audio slider (was 100%, now quieter)
 2. ✅ TRAX tooltip — replaced `ToolTip` binding with `ToolTipService.ToolTip` + `Placement="Top"` to fix z-order inside Viewbox overlay
 3. ✅ Mic meter boost — `MeterLevel` multiplied by 1.2× before clamping so the bar reads ~20% higher at same input level
-4. ✅ Click-to-position sliders — clicking anywhere on the mic/game volume slider track now jumps the thumb to that position before starting the drag
+4. ✅ Click-to-position sliders — clicking anywhere on the mic/game volume slider track now jumps the thumb to that position before starting the drag (fixed: RepeatButton no longer overrides click position; Thumb drag still works)
 5. ✅ Backdrop visibility — the dedicated `<Image>` now binds `Visibility` to `BackdropVisible` (ViewModel property); compositor checks `IsVisible` before blit
 6. ✅ Rename "Backdrop" → "Game Capture" in `EnsureBackdrop()` + test assertions
 7. ✅ Elements panel — new "ELEMENTS" section beneath Sources list; per-element config with live preview, ✕ revert, ✓ applied indicator
 8. ✅ Webcam border config — color hex input + color swatch picker, border thickness 0–10 slider
-9. ✅ Countdown source — `SourceType.Countdown`, pick list (Starting/BRB scenes only), timer minutes 1–60 default 15
+9. ✅ Countdown source — `SourceType.Countdown`, pick list (Starting/BRB scenes only), timer minutes 1–30 default 15, inline slider in source list row
 10. ✅ Web source — `SourceType.WebSource`, pick list (all scenes), URI text input
 
 ---