feat(graph): node library as a docked panel; shared dock chrome

The node library leaves the overlay and becomes a dock panel (PanelId::
NodeGraph), docked on the right the first time the graph opens and movable
like any other panel; closing it closes the graph. It follows the block
palette's layout: title bar, then a search box with New / Open / Save
beside it, then the categories, of which only Objects starts open. Entries
are clicked (placed at the canvas top-left) or dragged onto the canvas.

The title bar (title, auto-collapse pin, close, drag to re-dock), the
toolbar icon button and the panel frame were copied across Properties,
Block Palette, External References and Browser; they are now
dock::title_bar, dock::tool_button and dock::frame, used by all of them.
Block Palette's two tool buttons gain tooltips, and External References'
Auto / Close tooltips are now translated.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/app/node_graph.rs

@@ -170,6 +170,21 @@ impl OpenCADStudio {
             GraphMsg::Toggle => {
                 self.show_node_graph = !self.show_node_graph;
                 if self.show_node_graph {
+                    // The node library docks on the right on first use; after
+                    // that it stays wherever the user moved it.
+                    let id = crate::ui::dock::PanelId::NodeGraph;
+                    if self.dock.location(id).is_none() {
+                        self.dock
+                            .dock(id, crate::app::config::DockSide::Right, usize::MAX);
+                    }
+                    self.dock_expanded = Some(id);
+                    return self.graph_run(i);
+                }
+            }
+            GraphMsg::PaletteRelease => {
+                if let Some(Drag::Palette(item)) = self.tabs[i].graph.drag.take() {
+                    let pos = self.tabs[i].graph.drop_position(false);
+                    self.tabs[i].graph.add_node(item, Vec::new(), pos);
                     return self.graph_run(i);
                 }
             }
@@ -177,7 +192,7 @@ impl OpenCADStudio {
                 let sections = self.graph_all_sections(i);
                 match self.tabs[i].graph.drag.take() {
                     Some(Drag::Palette(item)) => {
-                        let pos = self.tabs[i].graph.drop_position();
+                        let pos = self.tabs[i].graph.drop_position(true);
                         self.tabs[i].graph.add_node(item, Vec::new(), pos);
                         return self.graph_run(i);
                     }

src/app/update/dialog.rs

@@ -605,6 +605,9 @@ pub(super) fn on_ribbon_tool_click(&mut self, tool_id: String, event: ModuleEven
                     PanelId::Browser => {
                         self.show_browser = false;
                     }
+                    PanelId::NodeGraph => {
+                        self.show_node_graph = false;
+                    }
                     PanelId::Properties => {
                         self.show_properties = false;
                         self.ribbon.set_properties(false);
@@ -708,6 +711,7 @@ pub(super) fn on_ribbon_tool_click(&mut self, tool_id: String, event: ModuleEven
             PanelId::BlockPalette => self.show_block_palette,
             PanelId::ExternalReferences => self.show_external_references,
             PanelId::Browser => self.show_browser,
+            PanelId::NodeGraph => self.show_node_graph,
         }
     }
 

src/app/view/mod.rs

@@ -1847,6 +1847,7 @@ bg={bg_ms:.1}ms n={view_count}"
                 crate::ui::dock::PanelId::BlockPalette => self.show_block_palette,
                 crate::ui::dock::PanelId::ExternalReferences => self.show_external_references,
                 crate::ui::dock::PanelId::Browser => self.show_browser,
+                crate::ui::dock::PanelId::NodeGraph => self.show_node_graph,
             }
         };
         let edge_stack = |side: crate::app::config::DockSide| -> Option<Element<'_, Message>> {
@@ -2950,6 +2951,7 @@ impl OpenCADStudio {
                 width,
                 auto_collapse,
             ),
+            crate::ui::dock::PanelId::NodeGraph => tab.graph.panel(width, auto_collapse),
         };
         let divider = dock_divider(id);
         match side {