Match unindent width to editor tabs

Co-authored-by: Codex <codex@openai.com>

Author: rcosta358

scripts/playground/editor-setup.mjs

@@ -1,6 +1,6 @@
 import { EditorState } from '@codemirror/state';
 import { lineNumbers, highlightActiveLineGutter, highlightSpecialChars, drawSelection, dropCursor, rectangularSelection, crosshairCursor, highlightActiveLine, keymap } from '@codemirror/view';
-import { indentOnInput, bracketMatching } from '@codemirror/language';
+import { indentOnInput, indentUnit, bracketMatching } from '@codemirror/language';
 import { history, defaultKeymap, historyKeymap, insertTab, indentLess } from '@codemirror/commands';
 import { searchKeymap } from '@codemirror/search';
 import { closeBrackets, autocompletion, closeBracketsKeymap, completionKeymap } from '@codemirror/autocomplete';
@@ -15,6 +15,7 @@ export const editorSetup = [
   dropCursor(),
   EditorState.allowMultipleSelections.of(true),
   indentOnInput(),
+  indentUnit.of('    '),
   bracketMatching(),
   closeBrackets(),
   autocompletion(),