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-peak-times.ts

@@ -1,5 +1,5 @@
 import type { PrismaClient } from "@capakraken/db";
-import type { WeekdayAvailability } from "@capakraken/shared";
+import { toIsoDate, DAY_KEYS, type WeekdayAvailability } from "@capakraken/shared";
 import { listAssignmentBookings } from "../allocation/list-assignment-bookings.js";
 import { getMonthBucketKey, getWeekBucketKey } from "./shared.js";
 import {
@@ -81,20 +81,6 @@ type PeakTimesCapacityDerivationSummary = Pick<
   | "calendarLocations"
 >;
 
-const DAY_KEYS: (keyof WeekdayAvailability)[] = [
-  "sunday",
-  "monday",
-  "tuesday",
-  "wednesday",
-  "thursday",
-  "friday",
-  "saturday",
-];
-
-function toIsoDate(value: Date): string {
-  return value.toISOString().slice(0, 10);
-}
-
 function round1(value: number): number {
   return Math.round(value * 10) / 10;
 }