fix: remove orphaned translation key from Spanish locale

- Remove unused 'editor.panels.edit.tabs.chat.mode.tooltip' key from es.json
- Fixes localization test failure that was preventing CI from passing
- Key was not used anywhere in codebase, confirmed via search

Co-Authored-By: [email protected] <[email protected]>

Author: devin-ai-integration[bot]

apps/web/client/messages/es.json

@@ -227,9 +227,6 @@
                             "placeholder": "Escriba su mensaje...",
                             "tooltip": "Chatee con IA sobre el elemento seleccionado"
                         },
-                        "mode": {
-                            "tooltip": "Cambiar entre modos Construir y Preguntar"
-                        },
                         "controls": {
                             "newChat": "Nuevo Chat",
                             "history": "Historial de Chat"
@@ -343,4 +340,4 @@
             "shortcuts": "Atajos"
         }
     }
-}
+}