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/application/src/use-cases/dashboard/get-demand.ts

@@ -1,5 +1,5 @@
 import type { PrismaClient } from "@capakraken/db";
-import type { WeekdayAvailability } from "@capakraken/shared";
+import { toIsoDate, type WeekdayAvailability } from "@capakraken/shared";
 import { loadDashboardPlanningReadModel } from "./load-dashboard-planning-read-model.js";
 import { calculateAllocationHours } from "./shared.js";
 import {
@@ -66,10 +66,6 @@ function toDate(value: Date | string): Date {
   return value instanceof Date ? value : new Date(value);
 }
 
-function toIsoDate(value: Date): string {
-  return value.toISOString().slice(0, 10);
-}
-
 function buildLocationKey(input: {
   countryCode: string | null | undefined;
   countryName: string | null | undefined;