refactor(web): extract allocation release classification

apps/web/src/hooks/useTimelineDrag.ts

@@ -11,18 +11,14 @@ import {
   scheduleLivePreview,
   type LivePreviewSession,
 } from "./timelineLivePreview.js";
-import {
-  buildAllocationMovedSnapshot,
-  hasAllocationDateChange,
-  shouldTreatAllocationDragAsClick,
-} from "./timelineAllocationFinalize.js";
-import { buildAllocationBlockClickInfo, buildAllocationMutationPlan } from "./timelineAllocationActions.js";
+import { buildAllocationMovedSnapshot } from "./timelineAllocationFinalize.js";
 import {
   finalizeAllocationMultiDrag,
   isAllocationMultiSelected,
   startAllocationMultiDrag,
   updateAllocationMultiDrag,
 } from "./timelineAllocationMultiDrag.js";
+import { resolveAllocationRelease } from "./timelineAllocationRelease.js";
 import { createAllocationDragState } from "./timelineAllocationDragState.js";
 import { attachDocumentMouseDrag } from "./timelineDocumentDrag.js";
 import { buildProjectShiftMutationInput, createProjectDragState } from "./timelineProjectDrag.js";
@@ -703,36 +699,24 @@ export function useTimelineDrag({
         allocDragCleanupRef.current = null;
         updateAllocationDragPosition(ev.clientX);
         const alloc = allocDragRef.current;
-        if (!alloc.isActive) return;
-        const hasDateChange = hasAllocationDateChange(alloc);
+        const release = resolveAllocationRelease(alloc, {
+          clickThresholdPx: DRAG_CLICK_THRESHOLD_PX,
+          wasShift,
+        });
+        if (release.kind === "ignore") return;
 
-        if (hasDateChange) {
+        if (release.preservePreview) {
           preserveLivePreview(allocPreviewRef.current);
         }
         clearLivePreview(allocPreviewRef.current);
         allocPreviewRef.current = null;
-        const shouldTreatAsClick = shouldTreatAllocationDragAsClick(alloc, DRAG_CLICK_THRESHOLD_PX);
-
-        if (shouldTreatAsClick && alloc.allocationId) {
-          // No movement → treat as click
-          if (wasShift) {
-            // Shift+Click → toggle multi-selection for this allocation
-            onShiftClickAllocRef.current?.(alloc.allocationId);
-          } else {
-            // Normal click → open alloc popover
-            const clickInfo = buildAllocationBlockClickInfo(alloc);
-            if (clickInfo) {
-              onBlockClickRef.current?.(clickInfo);
-            }
-          }
-        } else if (hasDateChange && alloc.allocationId && alloc.currentStartDate && alloc.currentEndDate) {
-          const mutationPlan = buildAllocationMutationPlan(alloc);
-          if (!mutationPlan) {
-            allocDragRef.current = INITIAL_ALLOC_DRAG;
-            setAllocDragState(INITIAL_ALLOC_DRAG);
-            return;
-          }
 
+        if (release.kind === "shift-click") {
+          onShiftClickAllocRef.current?.(release.allocationId);
+        } else if (release.kind === "click") {
+          onBlockClickRef.current?.(release.clickInfo);
+        } else if (release.kind === "mutation") {
+          const { mutationPlan } = release;
           const {
             activeAllocationId,
             currentStartDate,