fix(edit-pages): resolve custom field display race condition

The init watcher destructured currentType/currentStructure before
setting selectedTypeId, so the values were stale (null). This caused
refreshCustomFieldInputs to receive null structure → empty definitions,
permanently wiping custom field display on piece and component edit pages.

Read selectedType.value / selectedTypeStructure.value after setting the
ID so the computed is already updated. Also remove the guard on the
piece selectedType watcher that prevented recovery.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

app/pages/component/[id]/edit.vue

@@ -803,7 +803,9 @@ watch(
       void ensureConstructeurs(editionForm.constructeurIds)
     }
 
-    refreshCustomFieldInputs(currentStructure, currentComponent.customFieldValues)
+    // After setting selectedTypeId, read selectedTypeStructure.value (now updated) instead of
+    // the stale destructured currentStructure which was captured before the ID change.
+    refreshCustomFieldInputs(selectedTypeStructure.value ?? currentStructure, currentComponent.customFieldValues)
 
     initialized = true
   },

app/pages/pieces/[id]/edit.vue

@@ -837,7 +837,10 @@ watch(
       pendingProductIds = []
     }
 
-    refreshCustomFieldInputs(currentType?.structure ?? null, currentPiece.customFieldValues)
+    // After setting selectedTypeId, read selectedType.value (now updated) instead of
+    // the stale destructured currentType which was captured before the ID change.
+    const resolvedType = selectedType.value ?? pieceTypeDetails.value ?? null
+    refreshCustomFieldInputs(resolvedType?.structure ?? null, currentPiece.customFieldValues)
 
     initialized = true
   },
@@ -848,9 +851,7 @@ watch(selectedType, (currentType) => {
   if (!piece.value || !currentType) {
     return
   }
-  if (!pieceTypeDetails.value) {
-    refreshCustomFieldInputs(currentType.structure, piece.value.customFieldValues)
-  }
+  refreshCustomFieldInputs(currentType.structure, piece.value.customFieldValues)
 })
 
 watch(resolvedStructure, (currentStructure) => {