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/staffing/src/capacity-analyzer.ts

@@ -1,9 +1,10 @@
-import type {
-  Allocation,
-  CapacityWindow,
-  Resource,
-  UtilizationAnalysis,
-  UtilizationPeriod,
+import {
+  MILLISECONDS_PER_DAY,
+  type Allocation,
+  type CapacityWindow,
+  type Resource,
+  type UtilizationAnalysis,
+  type UtilizationPeriod,
 } from "@capakraken/shared";
 
 export interface CapacityAnalysisInput {
@@ -186,7 +187,7 @@ export function findCapacityWindows(
     current.setDate(current.getDate() + 1);
   }
 
-  closeWindow(new Date(end.getTime() + 86400000));
+  closeWindow(new Date(end.getTime() + MILLISECONDS_PER_DAY));
 
   return windows;
 }