feat(ui): gear to the rail, EDIT on the panel edge, preview undo/redo
Three creator directives (2026-11-01), done ahead of the surge. **Gear moved to the preview rail** — first tab, orange (Brush.Attention), gear icon only. Left-click opens the same app menu the top bar gear owned (Settings / Bug / Feature / About), right-click goes straight to App Settings; both behaviours moved with it, so nothing lost an entry point. TopBar keeps the wordmark and EDIT. **EDIT right edge aligned to the layers panel.** The work area is margin 8 + a 360px column, the top bar is padding 16, so the shared edge is 352 inside the bar. TopBar column 0 is now a fixed 352 grid with EDIT right-aligned in it — alignment by arithmetic instead of by eye. **Preview undo/redo: Ctrl+Z / Ctrl+Shift+Z.** Models/PreviewHistory snapshots element REFERENCES plus geometry, visibility, order and membership — a deep clone would mirror every property of a dozen element subclasses and quietly miss the next one added. One snapshot per gesture (pushed at drag/resize start, never in the move loop), bounded at 50, redo survives multiple undos, cleared on layout load. Gated on EditingActive: undo while the preview shows program output would rewrite a scene nobody is looking at. Honest scope, in the type's doc comment: layout edits only. Colour/opacity/border/font edits are not captured yet, so Ctrl+Z after one of those restores the last layout change. 6 tests in PreviewHistoryTests; 19 pass across it and the neighbouring UI classes; Debug and Release both build at 0 warnings.
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+21
-27
@@ -5,16 +5,25 @@
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x:Name="TopBarRoot">
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<Grid>
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<Grid.ColumnDefinitions>
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<ColumnDefinition Width="Auto"/>
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<!-- 352 = the layers panel's right edge in the work area below: window margin 8 +
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360px column = 368, minus this bar's own 16px padding. EDIT is right-aligned in
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this column so the two edges line up exactly (creator ruling 2026-11-01). -->
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<ColumnDefinition Width="352"/>
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<ColumnDefinition Width="*"/>
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<ColumnDefinition Width="Auto"/>
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</Grid.ColumnDefinitions>
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<!-- LOGO / BRAND — clicking opens the in-app About overlay; the gear sits
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a couple characters past the build stamp and opens App Settings. -->
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<StackPanel Grid.Column="0" Orientation="Horizontal" VerticalAlignment="Center"
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Margin="0,0,24,0">
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<Button Background="Transparent" BorderThickness="0" Cursor="Hand"
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<!-- BRAND + EDIT. The gear moved to the preview's right rail, first tab (2026-11-01):
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app-level actions live with the other pull-outs now. -->
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<Grid Grid.Column="0">
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<Grid.ColumnDefinitions>
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<ColumnDefinition Width="*"/>
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<ColumnDefinition Width="Auto"/>
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</Grid.ColumnDefinitions>
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<!-- LOGO / BRAND — clicking opens the in-app About overlay. -->
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<Button Grid.Column="0" Background="Transparent" BorderThickness="0" Cursor="Hand"
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HorizontalAlignment="Left"
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VerticalAlignment="Center" ToolTip="About LlamaCasty"
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Command="{Binding OpenAboutCommand}">
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<Button.Template>
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@@ -32,28 +41,13 @@
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ToolTipService.ToolTip="{x:Static helpers:BuildStamp.Label}"/><Run Text=" " FontSize="4"/>
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</TextBlock>
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</Button>
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<!-- Settings gear (user directive): a couple characters beyond the brand,
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nudged right a couple more places 2026-09-22 (build 77 feedback).
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Moved up from the bottom bar — one menu: App Settings / Bug / Feature / About. -->
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<Button Style="{StaticResource IconButton}" Margin="18,0,0,2" VerticalAlignment="Center"
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ToolTip="Menu" Click="GearButton_Click" PreviewMouseRightButtonDown="GearButton_PreviewMouseRightButtonDown">
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<Button.ContextMenu>
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<ContextMenu DataContext="{Binding PlacementTarget.DataContext, RelativeSource={RelativeSource Self}}">
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<MenuItem Header="App Settings" Command="{Binding OpenSettingsCommand}"/>
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<Separator/>
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<MenuItem Header="Report Bug" Command="{Binding OpenBugCommand}"/>
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<MenuItem Header="Feature Request" Command="{Binding OpenFeatureCommand}"/>
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<MenuItem Header="About" Command="{Binding OpenAboutCommand}"/>
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</ContextMenu>
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</Button.ContextMenu>
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<Path Data="M19.43,12.98c0.04,-0.32 0.07,-0.65 0.07,-0.98c0,-0.33 -0.03,-0.66 -0.07,-0.98l2.11,-1.65c0.19,-0.15 0.24,-0.42 0.12,-0.64l-2,-3.46c-0.12,-0.22 -0.38,-0.31 -0.61,-0.22l-2.49,1c-0.52,-0.4 -1.08,-0.73 -1.69,-0.98l-0.38,-2.65C14.46,2.18 14.25,2 14,2h-4c-0.25,0 -0.46,0.18 -0.49,0.42l-0.38,2.65c-0.61,0.25 -1.17,0.59 -1.69,0.98l-2.49,-1c-0.23,-0.09 -0.49,0 -0.61,0.22l-2,3.46c-0.13,0.22 -0.07,0.49 0.12,0.64l2.11,1.65c-0.04,0.32 -0.07,0.65 -0.07,0.98c0,0.33 0.03,0.66 0.07,0.98l-2.11,1.65c-0.19,0.15 -0.24,0.42 -0.12,0.64l2,3.46c0.12,0.22 0.38,0.31 0.61,0.22l2.49,-1c0.52,0.4 1.08,0.73 1.69,0.98l0.38,2.65c0.03,0.24 0.24,0.42 0.49,0.42h4c0.25,0 0.46,-0.18 0.49,-0.42l0.38,-2.65c0.61,-0.25 1.17,-0.59 1.69,-0.98l2.49,1c0.23,0.09 0.49,0 0.61,-0.22l2,-3.46c0.12,-0.22 0.07,-0.49 -0.12,-0.64L19.43,12.98zM12,15.5c-1.93,0 -3.5,-1.57 -3.5,-3.5c0,-1.93 1.57,-3.5 3.5,-3.5c1.93,0 3.5,1.57 3.5,3.5C15.5,13.93 13.93,15.5 12,15.5z"
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Fill="{StaticResource Brush.Attention}" Width="18" Height="18" Stretch="Uniform"/>
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</Button>
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<!-- EDIT: explicit toggle. Neutral = off (chat), blue = on (layers/properties). The
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trigger used to set the SAME colour as the resting state, so the button never
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looked pressed. -->
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<ToggleButton IsChecked="{Binding EditingActive, Mode=TwoWay}" Content="EDIT"
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Cursor="Hand" Height="32" Padding="14,0" Margin="18,0,0,2" VerticalAlignment="Center"
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looked pressed. Right edge aligns with the layers panel below. -->
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<ToggleButton Grid.Column="1" IsChecked="{Binding EditingActive, Mode=TwoWay}" Content="EDIT"
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Cursor="Hand" Height="32" Padding="14,0" Margin="18,0,0,2"
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HorizontalAlignment="Right" VerticalAlignment="Center"
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FontWeight="Bold" FontSize="12" Foreground="{StaticResource Brush.OnAccent}" BorderThickness="0">
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<ToggleButton.Template>
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<ControlTemplate TargetType="ToggleButton">
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@@ -68,7 +62,7 @@
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</ControlTemplate>
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</ToggleButton.Template>
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</ToggleButton>
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</StackPanel>
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</Grid>
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<!-- Session surface (top bar redesign): the bar is ONE surface rendered by
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the FIRST decision — Record or Stream. Each world is the whole bar; the
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