fix type errors

Author: mikebarkmin

platforms/web/src/Teach.tsx

@@ -114,7 +114,7 @@ function Teach() {
         const uploadId = `upload-${Date.now()}`;
         const storageId = json.settings?.id || uploadId;
 
-        await db.addTeacherMap(storageId, json, null);
+        await db.addTeacherMap(storageId, json, undefined);
         const maps = await db.getAllTeacherMaps();
         setAllMaps(maps);
         setShowAddDialog(false);

platforms/web/src/TeacherEditor.tsx

@@ -5,7 +5,6 @@ import "@learningmap/learningmap/index.css";
 import * as db from './db';
 import './TeacherEditor.css';
 import { Header } from './Header';
-import { Footer } from './Footer';
 
 // This component wraps the LearningMapEditor and saves maps to the teacher's collection
 // when they are shared