Unify mixed color selection

Use the shared color selector for mixed property values and remove the legacy inline palette and its state.

src/app/mod.rs

@@ -2523,8 +2523,6 @@ pub enum Message {
     /// properties-panel dropdown (a combo_box) opens, so at most one panel
     /// dropdown is open at a time and they can't overlap. (#235)
     PropColorPickerClose,
-    /// Toggle the full ACI colour palette expansion.
-    PropColorPaletteToggle,
     /// Enter the model-space editing mode inside the given viewport (MSPACE).
     EnterViewport(acadrust::Handle),
     /// Exit MSPACE and return to paper-space editing (PSPACE).

src/app/properties.rs

@@ -42,7 +42,6 @@ impl OpenCADStudio {
         // Note: the color-picker dropdown is intentionally NOT carried over — a
         // rebuild means the selection (or a property) changed, so the dropdown
         // closes, matching the deselect / reselect / click-away expectation.
-        let color_palette_open = self.tabs[i].properties.color_palette_open;
         let edit_buf = std::mem::take(&mut self.tabs[i].properties.edit_buf);
         let active_field = std::mem::take(&mut self.tabs[i].properties.active_field);
         // Expanded coordinate groups persist across rebuilds AND selection
@@ -2224,7 +2223,6 @@ impl OpenCADStudio {
             // Precompute the focused-id → field-key map for O(1) lookups on
             // `PropSyncActive`; derived from `sections`, so rebuild it here.
             panel.field_key_by_id = crate::ui::properties::build_field_key_map(&panel.sections);
-            panel.color_palette_open = color_palette_open;
             let new_handles: Vec<acadrust::Handle> = selected.iter().map(|(h, _)| *h).collect();
             // Carry the in-progress edits only when the selection is unchanged
             // (a commit-triggered rebuild); a genuine selection change starts
@@ -2265,7 +2263,6 @@ impl OpenCADStudio {
                 panel.edit_buf.clear();
                 panel.active_field = None;
                 panel.color_picker_open = false;
-                panel.color_palette_open = false;
                 panel.bg_color_picker_open = false;
                 panel.open_color_field = None;
                 panel.hatch_pattern_picker_open = false;

src/app/update/mod.rs

@@ -4653,7 +4653,6 @@ impl OpenCADStudio {
                 let i = self.active_tab;
                 let handles = self.property_target_handles(i);
                 if handles.is_empty() {
-                    self.tabs[i].properties.color_palette_open = false;
                     let task = self.on_ribbon_color_changed(color);
                     self.refresh_properties();
                     return task;
@@ -4666,7 +4665,6 @@ impl OpenCADStudio {
                     }
                 });
                 self.tabs[i].properties.color_picker_open = false;
-                self.tabs[i].properties.color_palette_open = false;
                 Task::none()
             }
 
@@ -4751,7 +4749,6 @@ impl OpenCADStudio {
                 panel.hatch_pattern_picker_open = !panel.hatch_pattern_picker_open;
                 if panel.hatch_pattern_picker_open {
                     panel.color_picker_open = false;
-                    panel.color_palette_open = false;
                     panel.open_color_field = None;
                     panel.edit_choice_open = false;
                     panel.hatch_pattern_focus =
@@ -5069,7 +5066,6 @@ impl OpenCADStudio {
                 self.tabs[i].properties.color_picker_open =
                     !self.tabs[i].properties.color_picker_open;
                 if self.tabs[i].properties.color_picker_open {
-                    self.tabs[i].properties.color_palette_open = false;
                     self.tabs[i].properties.hatch_pattern_picker_open = false;
                     self.tabs[i].properties.hatch_pattern_search.clear();
                 }
@@ -5311,18 +5307,11 @@ impl OpenCADStudio {
             Message::PropColorPickerClose => {
                 let i = self.active_tab;
                 self.tabs[i].properties.color_picker_open = false;
-                self.tabs[i].properties.color_palette_open = false;
                 self.tabs[i].properties.hatch_pattern_picker_open = false;
                 self.tabs[i].properties.hatch_pattern_search.clear();
                 Task::none()
             }
 
-            Message::PropColorPaletteToggle => {
-                self.tabs[self.active_tab].properties.color_palette_open =
-                    !self.tabs[self.active_tab].properties.color_palette_open;
-                Task::none()
-            }
-
             Message::LayoutSwitch(name) => {
                 self.layout_list_open = false;
                 self.on_layout_switch(name)

src/app/update/viewport.rs

@@ -2657,7 +2657,6 @@ impl OpenCADStudio {
         // press starts a box selection, so without this they'd only
         // close on the second click (issue #104).
         self.tabs[i].properties.color_picker_open = false;
-        self.tabs[i].properties.color_palette_open = false;
         // Click anywhere outside the popup dismisses it. The
         // menu's own buttons live above this mouse_area, so a
         // press that reaches here means the cursor is not on