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-server/src/engine/metadata-modules/flat-field-metadata/utils/from-update-field-input-to-flat-field-metadata.util.ts

@@ -99,12 +99,14 @@ export const fromUpdateFieldInputToFlatFieldMetadata = ({
     );
 
     if (invalidUpdatedProperties.length > 0) {
+      const invalidProperties = invalidUpdatedProperties.join(', ');
+
       return {
         status: 'fail',
         error: {
           code: FieldMetadataExceptionCode.INVALID_FIELD_INPUT,
-          message: `Cannot update standard field metadata properties: ${invalidUpdatedProperties.join(', ')}`,
-          userFriendlyMessage: t`Cannot update standard field properties: ${invalidUpdatedProperties.join(', ')}`,
+          message: `Cannot update standard field metadata properties: ${invalidProperties}`,
+          userFriendlyMessage: t`Cannot update standard field properties: ${invalidProperties}`,
         },
       };
     }

packages/twenty-server/src/engine/metadata-modules/flat-field-metadata/utils/run-flat-field-metadata-validators.util.ts

@@ -1,3 +1,5 @@
+import { t } from '@lingui/core/macro';
+
 import { FieldMetadataExceptionCode } from 'src/engine/metadata-modules/field-metadata/field-metadata.exception';
 import { type FlatFieldMetadataValidationError } from 'src/engine/metadata-modules/flat-field-metadata/types/flat-field-metadata-validation-error.type';
 import { type FlatMetadataValidator } from 'src/engine/metadata-modules/types/flat-metadata-validator.type';
@@ -15,7 +17,7 @@ export const runFlatFieldMetadataValidators = <T>({
     if (isInvalid) {
       return {
         code: FieldMetadataExceptionCode.INVALID_FIELD_INPUT,
-        message,
+        message: t(message),
         value: elementToValidate,
       };
     }