refactor(web): extract document drag listeners

scripts/check-architecture-guardrails.mjs

@@ -236,6 +236,17 @@ export const rules = [
     ],
     forbidden: [],
   },
+  {
+    file: "apps/web/src/hooks/timelineDocumentDrag.ts",
+    maxLines: 50,
+    required: [
+      {
+        pattern: /\bexport function attachDocumentMouseDrag\b/,
+        message: "timeline document drag helpers must keep document mouse listener wiring centralized",
+      },
+    ],
+    forbidden: [],
+  },
   {
     file: "apps/web/src/hooks/timelineAllocationDragState.ts",
     maxLines: 80,
@@ -293,6 +304,10 @@ export const rules = [
         pattern: /from "\.\/timelineAllocationActions\.js"/,
         message: "timeline drag must keep allocation click and mutation plan derivation delegated to the extracted helper module",
       },
+      {
+        pattern: /from "\.\/timelineDocumentDrag\.js"/,
+        message: "timeline drag must keep document mouse listener lifecycle delegated to the extracted helper module",
+      },
       {
         pattern: /from "\.\/timelineAllocationMultiDrag\.js"/,
         message: "timeline drag must keep allocation multi-drag rules delegated to the extracted helper module",
@@ -323,6 +338,10 @@ export const rules = [
         pattern: /\bfunction (?:buildAllocationBlockClickInfo|buildAllocationMutationPlan)\b/,
         message: "timeline drag must not re-inline extracted allocation action helper implementations",
       },
+      {
+        pattern: /\bfunction attachDocumentMouseDrag\b/,
+        message: "timeline drag must not re-inline extracted document listener helper implementations",
+      },
       {
         pattern: /\bfunction (?:isAllocationMultiSelected|startAllocationMultiDrag|updateAllocationMultiDrag|finalizeAllocationMultiDrag)\b/,
         message: "timeline drag must not re-inline extracted allocation multi-drag helper implementations",