refactor(FE-316): Add expandable secondary drawer panel

src/stores/ui/slices/drawer.slice.ts

@@ -37,4 +37,11 @@ export const createDrawerUISlice: StateCreator<
       callback(Boolean(state.isValid));
     });
   },
+
+  expandedDrawerOpen: false,
+  setExpandedDrawerOpen: (open: boolean) => set({ expandedDrawerOpen: open }),
+  toggleExpandedDrawer: () => {
+    const current = get().expandedDrawerOpen;
+    set({ expandedDrawerOpen: !current });
+  },
 });