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>

.claude/skills/skill-builder/.claude-flow/metrics/task-metrics.json

@@ -1,10 +0,0 @@
-[
-  {
-    "id": "cmd-hooks-1760892801573",
-    "type": "hooks",
-    "success": true,
-    "duration": 77.53740999999997,
-    "timestamp": 1760892801651,
-    "metadata": {}
-  }
-]