fix(web): make invalidation hooks async with Promise.all and fix cross-view staleness

- useInvalidateTimeline and useInvalidatePlanningViews now return
  Promise.all instead of fire-and-forget void calls
- Timeline mutations now use useInvalidatePlanningViews to also
  invalidate allocation list views, preventing stale data
- AllocationsClient sequential awaits replaced with single
  invalidatePlanningViews() call (parallel invalidation)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

apps/web/src/components/timeline/TimelineView.tsx

@@ -9,7 +9,7 @@ import { useProjectDragContext } from "~/hooks/useProjectDragContext.js";
 import { useTimelineDrag } from "~/hooks/useTimelineDrag.js";
 import { useTimelineLayout } from "~/hooks/useTimelineLayout.js";
 import { trpc } from "~/lib/trpc/client.js";
-import { useInvalidateTimeline } from "~/hooks/useInvalidatePlanningViews.js";
+import { useInvalidatePlanningViews } from "~/hooks/useInvalidatePlanningViews.js";
 import { getPlanningEntryMutationId } from "~/lib/planningEntryIds.js";
 import { FillOpenDemandModal } from "~/components/allocations/FillOpenDemandModal.js";
 import { AllocationPopover } from "./AllocationPopover.js";
@@ -95,9 +95,9 @@ export function TimelineView() {
   // We start with 40 (day zoom default) and update via a ref.
   const cellWidthRef = useRef(40);
 
-  const invalidateTimeline = useInvalidateTimeline();
+  const invalidatePlanningViews = useInvalidatePlanningViews();
   const batchShiftMutationOuter = trpc.timeline.batchShiftAllocations.useMutation({
-    onSuccess: invalidateTimeline,
+    onSuccess: () => void invalidatePlanningViews(),
   });
 
   const [dragErrorToast, setDragErrorToast] = useState<string | null>(null);
@@ -389,10 +389,10 @@ function TimelineViewContent({
   const resourceHoverTimerRef = useRef<ReturnType<typeof setTimeout> | null>(null);
   const previousViewModeRef = useRef(viewMode);
 
-  const invalidateTimelineInner = useInvalidateTimeline();
+  const invalidatePlanningViewsInner = useInvalidatePlanningViews();
   const batchDeleteMutation = trpc.allocation.batchDelete.useMutation({
     onSuccess: () => {
-      invalidateTimelineInner();
+      void invalidatePlanningViewsInner();
       clearMultiSelect();
     },
   });