fix: enable line wrapping in raw editor

Long lines now wrap to the next visual line instead of scrolling
horizontally off-screen, matching expected behavior.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/hooks/useCodeMirror.ts

@@ -91,6 +91,7 @@ export function useCodeMirror(
       extensions: [
         lineNumbers(),
         highlightActiveLine(),
+        EditorView.lineWrapping,
         history(),
         keymap.of([...defaultKeymap, ...historyKeymap]),
         buildSaveKeymap(callbacksRef),