feat(manage): surface About in the ribbon — Application group (#302)

The ABOUT command and its version-reporting window already exist, but
the ToolDef sat dead-code in the draw module with no ribbon entry, so
the only way in was typing ABOUT. Move it to the manage module and give
it an Application group on the Manage tab, as a discoverable fallback
for version diagnostics.

Co-Authored-By: Claude Fable 5 <[email protected]>

src/modules/draw/mod.rs

@@ -1,6 +1,5 @@
 // Draw module — Draw, Modify, Annotation and Layer tools.
 
-mod about;
 mod changelog;
 pub mod clipboard;
 pub mod defaults;

src/modules/manage/about.rs

@@ -1,6 +1,5 @@
 use crate::modules::{IconKind, ModuleEvent, ToolDef};
 
-#[allow(dead_code)]
 pub fn tool() -> ToolDef {
     ToolDef {
         id: "ABOUT",

src/modules/manage/mod.rs

@@ -1,5 +1,6 @@
 // Manage module — customization and drawing cleanup tools.
 
+mod about;
 mod audit;
 mod cui_export;
 mod cui_import;
@@ -75,6 +76,11 @@ impl CadModule for ManageModule {
                         RibbonItem::Tool(audit::tool()),
                     ],
                 },
+                // ── Application ───────────────────────────────────────────────────
+                RibbonGroup {
+                    title: "Application",
+                    tools: vec![RibbonItem::LargeTool(about::tool())],
+                },
             ]
         })
     }