fix(frontend): handle Edge API format for multivariate variation overrides

The Edge API returns multivariate_feature_option as an object with a
value property ({ value: number }), while the regular API returns it
as a plain number. This caused the variation selection to fail to match
when editing identity overrides on Edge API.

The fix adds a check to handle both formats when finding the matching
variation override.

Fixes #6582

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: talissoncosta

frontend/web/components/mv/VariationOptions.tsx

@@ -110,9 +110,14 @@ export const VariationOptions: React.FC<VariationOptionsProps> = ({
               i === variationOverrides[0].multivariate_feature_option_index &&
               variationOverrides[0]
           } else {
-            override = variationOverrides?.find(
-              (v) => v.multivariate_feature_option === theValue.id,
-            )
+            override = variationOverrides?.find((v) => {
+              // Handle both Edge API format ({ value: number }) and regular format (number)
+              const optionId =
+                typeof v.multivariate_feature_option === 'object'
+                  ? v.multivariate_feature_option?.value
+                  : v.multivariate_feature_option
+              return optionId === theValue.id
+            })
           }
         } else {
           override = variationOverrides?.find(