fix(external-editor): Fix TextEditorConfig parsing and add error handling

- TextEditorConfig.from_dict no longer requires 'name' field since name comes from dict key
- Added try/except around _render_external_editor_panel to prevent tab bar mismatch

src/gui_2.py

@@ -974,7 +974,10 @@ class App:
         self._render_external_tools_panel()
         imgui.separator()
         imgui.text("")
-        self._render_external_editor_panel()
+        try:
+         self._render_external_editor_panel()
+        except Exception as e:
+         imgui.text_colored(vec4(1, 0.3, 0.3, 1), f"Error: {str(e)}")
         imgui.end_tab_item()
       if imgui.begin_tab_item("Workspace Layouts")[0]:
        imgui.text("Experimental: Auto-switch layout by Tier")

src/models.py

@@ -425,7 +425,11 @@ class ExternalEditorConfig:
   editors = {}
   for name, ed_data in data.get("editors", {}).items():
    if isinstance(ed_data, dict):
-    editors[name] = TextEditorConfig.from_dict(ed_data)
+    editors[name] = TextEditorConfig(
+     name=name,
+     path=ed_data.get("path", ""),
+     diff_args=ed_data.get("diff_args", []),
+    )
    elif isinstance(ed_data, str):
     editors[name] = TextEditorConfig(name=name, path=ed_data)
   return cls(