fix: Enable Lingui recommended rules and fix all translation violations (#14133)

- Enable lingui/no-single-variables-to-translate and all other
recommended Lingui rules
- Fix single variable translation patterns (t`${variable}` → variable)
- Fix expression-in-message violations by extracting variables
- Fix t-call-in-function violations by moving translations inside
functions
- Update ESLint configs to use linguiPlugin.configs['flat/recommended']
- Clean up unused imports and improve translation patterns

packages/twenty-front/src/modules/client-config/components/ClientConfigProvider.tsx

@@ -2,11 +2,13 @@ import { useRecoilValue } from 'recoil';
 
 import { clientConfigApiStatusState } from '@/client-config/states/clientConfigApiStatusState';
 import { AppFullScreenErrorFallback } from '@/error-handler/components/AppFullScreenErrorFallback';
+import { useLingui } from '@lingui/react/macro';
 
 export const ClientConfigProvider: React.FC<React.PropsWithChildren> = ({
   children,
 }) => {
   const { isErrored, error } = useRecoilValue(clientConfigApiStatusState);
+  const { t } = useLingui();
 
   return isErrored && error instanceof Error ? (
     <AppFullScreenErrorFallback
@@ -14,7 +16,7 @@ export const ClientConfigProvider: React.FC<React.PropsWithChildren> = ({
       resetErrorBoundary={() => {
         window.location.reload();
       }}
-      title="Unable to Reach Back-end"
+      title={t`Unable to Reach Back-end`}
     />
   ) : (
     children