fix(external_editor): only auto-detect when no editors configured

config.toml

@@ -52,7 +52,7 @@ Response = false
 "Tool Calls" = false
 Theme = true
 "Log Management" = true
-Diagnostics = false
+Diagnostics = true
 "External Tools" = false
 "Shader Editor" = false
 "Undo/Redo History" = false
@@ -86,6 +86,7 @@ chunk_overlap = 200
 provider = "mock"
 collection_name = "manual_slop"
 
+
 [tools.text_editors.vscode]
 path = "C:\\apps\\Microsoft VS Code Insiders\\Code - Insiders.exe"
 diff_args = [