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/shared/src/constants/index.ts

@@ -1,5 +1,42 @@
+import type { WeekdayAvailability } from "../types/resource.js";
+
 export * from "./germanStates.js";
 export * from "./publicHolidays.js";
+
+export const MILLISECONDS_PER_DAY = 86_400_000;
+
+export function toIsoDate(value: Date | string): string {
+  if (typeof value === "string") return value.slice(0, 10);
+  return value.toISOString().slice(0, 10);
+}
+
+export function toIsoDateOrNull(value: Date | string | null | undefined): string | null {
+  if (!value) return null;
+  return toIsoDate(value);
+}
+
+export function round1(value: number): number {
+  return Math.round(value * 10) / 10;
+}
+
+export function averagePerWorkingDay(totalHours: number, workingDays: number): number {
+  if (workingDays <= 0) return 0;
+  return round1(totalHours / workingDays);
+}
+
+export const DAY_KEYS: readonly (keyof WeekdayAvailability)[] = [
+  "sunday", "monday", "tuesday", "wednesday", "thursday", "friday", "saturday",
+] as const;
+
+export function normalizeCityName(cityName?: string | null): string | null {
+  const normalized = cityName?.trim().toLowerCase();
+  return normalized && normalized.length > 0 ? normalized : null;
+}
+
+export function normalizeStateCode(stateCode?: string | null): string | null {
+  const normalized = stateCode?.trim().toUpperCase();
+  return normalized && normalized.length > 0 ? normalized : null;
+}
 export * from "./columns.js";
 export * from "./dispo-import.js";
 export * from "./data-classification.js";