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/allocation/chargeability.ts

@@ -1,4 +1,4 @@
-import type { WeekdayAvailability } from "@capakraken/shared";
+import { DAY_KEYS, type WeekdayAvailability } from "@capakraken/shared";
 
 export interface ChargeabilityAllocation {
   startDate: Date;
@@ -12,11 +12,6 @@ export interface ChargeabilityResult {
   chargeability: number; // 0-100, rounded
 }
 
-// Maps JS getDay() (0=Sun..6=Sat) to WeekdayAvailability keys
-const DAY_KEYS: (keyof WeekdayAvailability)[] = [
-  "sunday", "monday", "tuesday", "wednesday", "thursday", "friday", "saturday",
-];
-
 /** Count working hours a resource has available in [start, end] based on their schedule. */
 export function computeAvailableHours(
   availability: WeekdayAvailability,

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 };
 }
 

packages/engine/src/sah/calculator.ts

@@ -5,6 +5,7 @@
  * It is the denominator for chargeability calculations.
  */
 
+import { toIsoDate } from "@capakraken/shared";
 import type { SpainScheduleRule } from "@capakraken/shared";
 
 // ─── Types ──────────────────────────────────────────────────────────────────
@@ -47,11 +48,6 @@ export interface SAHResult {
 
 // ─── Helpers ────────────────────────────────────────────────────────────────
 
-function toISODate(d: Date | string): string {
-  if (typeof d === "string") return d.slice(0, 10);
-  return d.toISOString().slice(0, 10);
-}
-
 function isWeekend(date: Date): boolean {
   const day = date.getUTCDay();
   return day === 0 || day === 6;
@@ -93,8 +89,8 @@ export function getDailyHours(
 export function calculateSAH(input: SAHInput): SAHResult {
   const { dailyWorkingHours, scheduleRules, fte, periodStart, periodEnd, publicHolidays, absenceDays } = input;
 
-  const holidaySet = new Set(publicHolidays.map(toISODate));
-  const absenceSet = new Set(absenceDays.map(toISODate));
+  const holidaySet = new Set(publicHolidays.map(toIsoDate));
+  const absenceSet = new Set(absenceDays.map(toIsoDate));
 
   let calendarDays = 0;
   let weekendDays = 0;