refactor(web): extract project drag helpers

scripts/check-architecture-guardrails.mjs

@@ -217,6 +217,21 @@ export const rules = [
     ],
     forbidden: [],
   },
+  {
+    file: "apps/web/src/hooks/timelineProjectDrag.ts",
+    maxLines: 80,
+    required: [
+      {
+        pattern: /\bexport function createProjectDragState\b/,
+        message: "timeline project drag helpers must keep drag-state bootstrap centralized",
+      },
+      {
+        pattern: /\bexport function buildProjectShiftMutationInput\b/,
+        message: "timeline project drag helpers must keep no-op project-shift mutation gating centralized",
+      },
+    ],
+    forbidden: [],
+  },
   {
     file: "apps/web/src/hooks/useTimelineDrag.ts",
     required: [
@@ -248,6 +263,10 @@ export const rules = [
         pattern: /from "\.\/timelineAllocationMultiDrag\.js"/,
         message: "timeline drag must keep allocation multi-drag rules delegated to the extracted helper module",
       },
+      {
+        pattern: /from "\.\/timelineProjectDrag\.js"/,
+        message: "timeline drag must keep project drag bootstrap and mutation gating delegated to the extracted helper module",
+      },
     ],
     forbidden: [
       {
@@ -266,6 +285,10 @@ export const rules = [
         pattern: /\bfunction (?:isAllocationMultiSelected|startAllocationMultiDrag|updateAllocationMultiDrag|finalizeAllocationMultiDrag)\b/,
         message: "timeline drag must not re-inline extracted allocation multi-drag helper implementations",
       },
+      {
+        pattern: /\bfunction (?:createProjectDragState|buildProjectShiftMutationInput)\b/,
+        message: "timeline drag must not re-inline extracted project drag helper implementations",
+      },
     ],
   },
   {