fix: misc lesson issues

frontend/src/utils/index.js

@@ -137,6 +137,9 @@ export function getEditorTools() {
 		paragraph: {
 			class: Paragraph,
 			inlineToolbar: true,
+			config: {
+				preserveBlank: true,
+			},
 		},
 		codeBox: {
 			class: CodeBox,

frontend/src/utils/upload.js

@@ -16,7 +16,7 @@ export class Upload {
 
 	renderUpload(file) {
 		if (this.isVideo(file.file_type)) {
-			return `<video controls width='100%' controlsList='nodownload' class="mb-4">
+			return `<video controls width='100%' controlsList='nodownload' class="mb-4" oncontextmenu="return false;">
 				<source src=${encodeURI(file.file_url)} type='video/mp4'>
 			</video>`
 		} else if (this.isAudio(file.file_type)) {