fix(editor): Enable explicit undo keyboard shortcut across all code editors (#8178)

Fixes [ADO-801](https://linear.app/n8n/issue/ADO-801),
[PAY-632](https://linear.app/n8n/issue/PAY-632), and
[PAY-730](https://linear.app/n8n/issue/PAY-730)
Also fixes #5297

## Review / Merge checklist
- [x] PR title and summary are descriptive

packages/editor-ui/src/components/CodeNodeEditor/CodeNodeEditor.vue

@@ -86,6 +86,7 @@ export default defineComponent({
 		mode: {
 			type: String as PropType<CodeExecutionMode>,
 			validator: (value: CodeExecutionMode): boolean => CODE_EXECUTION_MODES.includes(value),
+			required: true,
 		},
 		language: {
 			type: String as PropType<CodeNodeEditorLanguage>,
@@ -103,6 +104,7 @@ export default defineComponent({
 		},
 		modelValue: {
 			type: String,
+			required: true,
 		},
 	},
 	setup() {

packages/editor-ui/src/components/CodeNodeEditor/baseExtensions.ts

@@ -16,6 +16,7 @@ import {
 	toggleComment,
 	redo,
 	deleteCharBackward,
+	undo,
 } from '@codemirror/commands';
 import { lintGutter } from '@codemirror/lint';
 import type { Extension } from '@codemirror/state';
@@ -43,6 +44,7 @@ export const writableEditorExtensions: readonly Extension[] = [
 		{ key: 'Tab', run: acceptCompletion },
 		{ key: 'Enter', run: acceptCompletion },
 		{ key: 'Mod-/', run: toggleComment },
+		{ key: 'Mod-z', run: undo },
 		{ key: 'Mod-Shift-z', run: redo },
 		{ key: 'Backspace', run: deleteCharBackward, shift: deleteCharBackward },
 		indentWithTab,