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/engine/src/estimate/weekly-phasing.ts

@@ -10,6 +10,8 @@
  * - Aggregation by chapter for 4Dispo view
  */
 
+import { MILLISECONDS_PER_DAY } from "@capakraken/shared";
+
 export interface WeekDefinition {
   weekNumber: number;
   year: number;
@@ -42,7 +44,7 @@ function getISOWeekData(date: Date): { year: number; week: number } {
   const dayNum = d.getUTCDay() || 7;
   d.setUTCDate(d.getUTCDate() + 4 - dayNum);
   const yearStart = new Date(Date.UTC(d.getUTCFullYear(), 0, 1));
-  const week = Math.ceil(((d.getTime() - yearStart.getTime()) / 86_400_000 + 1) / 7);
+  const week = Math.ceil(((d.getTime() - yearStart.getTime()) / MILLISECONDS_PER_DAY + 1) / 7);
   return { year: d.getUTCFullYear(), week };
 }