refactor(common-config): extract snippet from editor content instead of active provider

- Change extraction source from current active provider to editor's live content
- Add i18n support for JSON parse error messages via invalid_json_format_error()
- Simplify API by removing unused providerId parameter
- Update button labels and error messages in zh/en/ja locales

src/components/providers/forms/GeminiCommonConfigModal.tsx

@@ -63,7 +63,7 @@ export const GeminiCommonConfigModal: React.FC<
                 <Download className="w-4 h-4" />
               )}
               {t("geminiConfig.extractFromCurrent", {
-                defaultValue: "从当前供应商提取",
+                defaultValue: "从编辑内容提取",
               })}
             </Button>
           )}