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.
2026-11-01 07:46:10 -08:00
parent bd669f2e73
commit fdb27f0758
14 changed files with 403 additions and 55 deletions
@@ -883,6 +883,28 @@
                            </Border>
                            <!-- The stacked white tabs -->
                            <StackPanel Orientation="Vertical" HorizontalAlignment="Right" VerticalAlignment="Stretch">
+                                <!-- Settings: the first tab, orange, gear only (creator ruling 2026-11-01 —
+                                     moved off the top bar). Left-click opens the same app menu
+                                     (Settings / Bug / Feature / About); right-click goes straight
+                                     to App Settings, matching the old gear's behaviour exactly. -->
+                                <Border Width="30" VerticalAlignment="Center" Background="{StaticResource Brush.Attention}"
+                                        CornerRadius="4,0,0,4" Padding="0,10" Cursor="Hand" Margin="0,4,0,0"
+                                        ToolTip="App menu — right-click for Settings"
+                                        MouseLeftButtonUp="SettingsTab_Click"
+                                        PreviewMouseRightButtonDown="SettingsTab_PreviewMouseRightButtonDown">
+                                    <Border.ContextMenu>
+                                        <ContextMenu DataContext="{Binding PlacementTarget.DataContext, RelativeSource={RelativeSource Self}}">
+                                            <MenuItem Header="App Settings" Command="{Binding OpenSettingsCommand}"/>
+                                            <Separator/>
+                                            <MenuItem Header="Report Bug" Command="{Binding OpenBugCommand}"/>
+                                            <MenuItem Header="Feature Request" Command="{Binding OpenFeatureCommand}"/>
+                                            <MenuItem Header="About" Command="{Binding OpenAboutCommand}"/>
+                                        </ContextMenu>
+                                    </Border.ContextMenu>
+                                    <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"
+                                          Fill="{StaticResource Brush.Background}" Width="18" Height="18" Stretch="Uniform"
+                                          HorizontalAlignment="Center"/>
+                                </Border>
                                <Border Width="30" VerticalAlignment="Center" Background="{StaticResource Brush.Youtube}"
                                        CornerRadius="4,0,0,4" Padding="0,10" Cursor="Hand" Margin="0,4,0,0"
                                        ToolTip="Broadcast text fields">