chore: remove now-unneeded cast (#9016)

Author: maribethb

core/contextmenu_registry.ts

@@ -155,8 +155,7 @@ export namespace ContextMenuRegistry {
     block?: BlockSvg;
     workspace?: WorkspaceSvg;
     comment?: RenderedWorkspaceComment;
-    // TODO(#8839): Remove any once Block, etc. implement IFocusableNode
-    focusedNode?: IFocusableNode | any;
+    focusedNode?: IFocusableNode;
   }
 
   /**

core/shortcut_registry.ts

@@ -253,18 +253,19 @@ export class ShortcutRegistry {
         !shortcut ||
         (shortcut.preconditionFn &&
           !shortcut.preconditionFn(workspace, {
-            focusedNode: getFocusManager().getFocusedNode(),
+            focusedNode: getFocusManager().getFocusedNode() ?? undefined,
           }))
       ) {
         continue;
       }
       // If the key has been handled, stop processing shortcuts.
       if (
         shortcut.callback?.(workspace, e, shortcut, {
-          focusedNode: getFocusManager().getFocusedNode(),
+          focusedNode: getFocusManager().getFocusedNode() ?? undefined,
         })
-      )
+      ) {
         return true;
+      }
     }
     return false;
   }