feat: redesign Manage tab to match reference layout

- Add Customization group: User Interface (CUI), Tool Palettes (large),
  Import, Export, Edit Aliases dropdown (small)
- Add Cleanup group: Find Non-Purgeable Items (large), Purge, Overkill, Audit (small)
- Add 8 new SVG icons for all new commands

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/modules/manage/mod.rs

@@ -1,8 +1,16 @@
-// Manage module — application settings and customization tools.
+// Manage module — customization and drawing cleanup tools.
 
+mod audit;
+mod cui_export;
+mod cui_import;
+mod edit_aliases;
+mod find_nonpurgeable;
 mod options;
+mod overkill;
+mod purge;
+mod user_interface;
 
-use crate::modules::{CadModule, RibbonGroup};
+use crate::modules::{CadModule, IconKind, RibbonGroup, RibbonItem};
 
 pub struct ManageModule;
 
@@ -15,9 +23,41 @@ impl CadModule for ManageModule {
     }
 
     fn ribbon_groups(&self) -> Vec<RibbonGroup> {
-        vec![RibbonGroup {
-            title: "Settings",
-            tools: vec![options::tool().into()],
-        }]
+        vec![
+            // ── Customization ─────────────────────────────────────────────────
+            RibbonGroup {
+                title: "Customization",
+                tools: vec![
+                    RibbonItem::LargeTool(user_interface::tool()),
+                    RibbonItem::LargeTool(crate::modules::ToolDef {
+                        id: "TOOLPALETTES",
+                        label: "Tool\nPalettes",
+                        icon: IconKind::Svg(include_bytes!("../../../assets/icons/tool_palettes.svg")),
+                        event: crate::modules::ModuleEvent::Command("TOOLPALETTES".to_string()),
+                    }),
+                    RibbonItem::Tool(cui_import::tool()),
+                    RibbonItem::Tool(cui_export::tool()),
+                    RibbonItem::Dropdown {
+                        id: "ALIASEDIT_DROPDOWN",
+                        icon: IconKind::Svg(include_bytes!("../../../assets/icons/edit_aliases.svg")),
+                        items: vec![
+                            ("ALIASEDIT",  "Edit Aliases",   IconKind::Svg(include_bytes!("../../../assets/icons/edit_aliases.svg"))),
+                            ("CUILOAD",    "Load Partial CUI", IconKind::Svg(include_bytes!("../../../assets/icons/cui_import.svg"))),
+                        ],
+                        default: "ALIASEDIT",
+                    },
+                ],
+            },
+            // ── Cleanup ───────────────────────────────────────────────────────
+            RibbonGroup {
+                title: "Cleanup",
+                tools: vec![
+                    RibbonItem::LargeTool(find_nonpurgeable::tool()),
+                    RibbonItem::Tool(purge::tool()),
+                    RibbonItem::Tool(overkill::tool()),
+                    RibbonItem::Tool(audit::tool()),
+                ],
+            },
+        ]
     }
 }