Fix CodeMirror stability and dispatch errors

- Replaced dangerous custom dispatch override with EditorView.updateListener.
- Resolved 'Uncaught TypeError: child is undefined' by allowing CodeMirror to manage its own update cycle.
- Improved Svelte state syncing for new_content.

src/lib/app_components/e_app_codemirror_v5.svelte

@@ -86,6 +86,13 @@
             theme_mode == 'dark' ? cm_modules.oneDark : cm_modules.EditorView.baseTheme(),
             cm_modules.EditorView.contentAttributes.of({ spellcheck: 'true' }), // Enable spell check
 
+            // Sync document changes back to Svelte
+            cm_modules.EditorView.updateListener.of((update: any) => {
+                if (update.docChanged) {
+                    new_content = update.state.doc.toString();
+                }
+            }),
+
             // Conditional extensions based on props
             editable ? cm_modules.EditorView.editable.of(true) : null,
             readonly ? cm_modules.EditorState.readOnly.of(true) : null,
@@ -103,13 +110,7 @@
                 doc: content,
                 extensions: editor_extensions
             }),
-            parent: editor_element,
-            dispatch: (transaction: any) => {
-                editorView.update([transaction]);
-                if (transaction.docChanged) {
-                    new_content = editorView.state.doc.toString();
-                }
-            }
+            parent: editor_element
         });
     }