fix(editor): don't convert text that's pasted into a code block to markdown

Resolves https://community.vikunja.io/t/pasting-into-code-block-renders-markdown/4181

frontend/src/components/input/editor/TipTap.vue

@@ -373,12 +373,18 @@ const PasteHandler = Extension.create({
 								}
 							}
 						}
-						
+
 						const text = event.clipboardData?.getData('text/plain') || ''
 						if (!text) {
 							return false
 						}
 
+						// Don't convert markdown when pasting inside a code block
+						const $from = view.state.selection.$from
+						if ($from.parent.type.name === 'codeBlock') {
+							return false
+						}
+
 						const hasMarkdownSyntax = new RegExp('[*`_\\[\\]#-]').test(text)
 						if (!hasMarkdownSyntax) {
 							return false