feat(timeline): add pulse animation for in-flight drag mutations

Allocation bars that have active optimistic overrides (post-drag,
awaiting server confirmation) now pulse subtly via animate-pulse.
The pending set is derived from the existing optimisticAllocations
map keys, requiring no additional state.

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

packages/api/src/router/timeline-read-shared.ts

@@ -45,12 +45,7 @@ export function getAssignmentResourceIds(
   ];
 }
 
-export function fmtDate(value: Date | null | undefined): string | null {
-  if (!value) {
-    return null;
-  }
-  return value.toISOString().slice(0, 10);
-}
+export { toIsoDateOrNull as fmtDate } from "@capakraken/shared";
 
 export function createEmptyTimelineEntriesView() {
   return buildSplitAllocationReadModel({