Create flow centralization and cleanup

lib/create/stripCustomRuleSelectionFields.ts

@@ -1,22 +1,19 @@
 import type { CreateFlowState } from "../../app/(app)/create/types";
+import { STRIP_CUSTOM_RULE_SELECTION_STATE_KEYS } from "./customRuleFacets";
 
 /**
  * Same field removal as {@link resetCustomRuleSelections} in CreateFlowProvider.
  * Used to apply template "Use without changes" in one atomic replaceState updater.
+ *
+ * Keys come from {@link CUSTOM_RULE_FACETS} / {@link STRIP_CUSTOM_RULE_SELECTION_STATE_KEYS}
+ * (Linear CR-92).
  */
 export function stripCustomRuleSelectionFields(
   prev: CreateFlowState,
 ): CreateFlowState {
-  const {
-    selectedCoreValueIds: _a,
-    coreValuesChipsSnapshot: _b,
-    coreValueDetailsByChipId: _c,
-    selectedCommunicationMethodIds: _d,
-    selectedMembershipMethodIds: _e,
-    selectedDecisionApproachIds: _f,
-    selectedConflictManagementIds: _g,
-    methodSectionsPinCommitted: _h,
-    ...rest
-  } = prev;
-  return rest;
+  const out: CreateFlowState = { ...prev };
+  for (const key of STRIP_CUSTOM_RULE_SELECTION_STATE_KEYS) {
+    delete (out as Record<string, unknown>)[key as string];
+  }
+  return out;
 }