refactor(web): extract allocation drag action plans

apps/web/src/hooks/useTimelineDrag.ts

@@ -14,9 +14,9 @@ import {
 import {
   buildAllocationMovedSnapshot,
   hasAllocationDateChange,
-  requiresAllocationFragmentExtraction,
   shouldTreatAllocationDragAsClick,
 } from "./timelineAllocationFinalize.js";
+import { buildAllocationBlockClickInfo, buildAllocationMutationPlan } from "./timelineAllocationActions.js";
 import {
   finalizeAllocationMultiDrag,
   isAllocationMultiSelected,
@@ -729,22 +729,29 @@ export function useTimelineDrag({
             onShiftClickAllocRef.current?.(alloc.allocationId);
           } else {
             // Normal click → open alloc popover
-            onBlockClickRef.current?.({
-              allocationId: alloc.allocationId,
-              projectId: alloc.projectId ?? "",
-              projectName: alloc.projectName ?? "",
-              startDate: alloc.originalStartDate!,
-              endDate: alloc.originalEndDate!,
-            });
+            const clickInfo = buildAllocationBlockClickInfo(alloc);
+            if (clickInfo) {
+              onBlockClickRef.current?.(clickInfo);
+            }
           }
         } else if (hasDateChange && alloc.allocationId && alloc.currentStartDate && alloc.currentEndDate) {
-          const activeAllocationId = alloc.allocationId;
-          const currentStartDate = alloc.currentStartDate;
-          const currentEndDate = alloc.currentEndDate;
-          const baseMutationAllocationId = alloc.mutationAllocationId ?? activeAllocationId;
-          const requiresExtraction = requiresAllocationFragmentExtraction(alloc);
+          const mutationPlan = buildAllocationMutationPlan(alloc);
+          if (!mutationPlan) {
+            allocDragRef.current = INITIAL_ALLOC_DRAG;
+            setAllocDragState(INITIAL_ALLOC_DRAG);
+            return;
+          }
 
-          pendingSnapshotRef.current = buildAllocationMovedSnapshot(alloc);
+          const {
+            activeAllocationId,
+            currentStartDate,
+            currentEndDate,
+            baseMutationAllocationId,
+            requiresExtraction,
+            pendingSnapshot,
+          } = mutationPlan;
+
+          pendingSnapshotRef.current = pendingSnapshot;
           pendingOptimisticAllocationIdRef.current = activeAllocationId;
           setOptimisticAllocations((prev) => {
             const next = new Map(prev);