refactor(web): extract touch event forwarding

scripts/check-architecture-guardrails.mjs

@@ -149,6 +149,33 @@ export const rules = [
     ],
     forbidden: [],
   },
+  {
+    file: "apps/web/src/hooks/timelineTouchEvents.ts",
+    maxLines: 80,
+    required: [
+      {
+        pattern: /\bexport function forwardTouchStartAsMouseDown\b/,
+        message: "timeline touch event helpers must keep touch-start forwarding centralized",
+      },
+      {
+        pattern: /\bexport function forwardCanvasTouchMove\b/,
+        message: "timeline touch event helpers must keep touch-move forwarding centralized",
+      },
+      {
+        pattern: /\bexport function forwardCanvasTouchEnd\b/,
+        message: "timeline touch event helpers must keep touch-end forwarding centralized",
+      },
+      {
+        pattern: /from "\.\/timelineTouch\.js"/,
+        message: "timeline touch event helpers must keep touch policy delegated to the extracted helper module",
+      },
+      {
+        pattern: /from "\.\/timelineTouchAdapters\.js"/,
+        message: "timeline touch event helpers must keep touch adapter wiring delegated to the extracted helper module",
+      },
+    ],
+    forbidden: [],
+  },
   {
     file: "apps/web/src/hooks/timelineMultiSelect.ts",
     maxLines: 90,
@@ -404,12 +431,8 @@ export const rules = [
         message: "timeline drag must keep live preview behavior delegated to the extracted helper module",
       },
       {
-        pattern: /from "\.\/timelineTouch\.js"/,
-        message: "timeline drag must keep touch fallback and drag disambiguation delegated to the extracted helper module",
-      },
-      {
-        pattern: /from "\.\/timelineTouchAdapters\.js"/,
-        message: "timeline drag must keep touch pointer adapter wiring delegated to the extracted helper module",
+        pattern: /from "\.\/timelineTouchEvents\.js"/,
+        message: "timeline drag must keep touch event forwarding delegated to the extracted helper module",
       },
       {
         pattern: /from "\.\/timelineMultiSelect\.js"/,
@@ -474,12 +497,8 @@ export const rules = [
         message: "timeline drag must not re-inline live preview helper implementations",
       },
       {
-        pattern: /\bfunction toClientX\b/,
-        message: "timeline drag must not re-inline touch coordinate fallback helpers",
-      },
-      {
-        pattern: /as (?:unknown as )?React\.MouseEvent/,
-        message: "timeline drag must not re-inline synthetic touch pointer adapters",
+        pattern: /\b(?:getTouchPoint|resolveTouchDragDecision|createTouchCanvasPointerEvent|createTouchMouseDownEvent)\b/,
+        message: "timeline drag must not re-inline extracted touch event forwarding dependencies",
       },
       {
         pattern: /\bfunction (?:hasAllocationDateChange|shouldTreatAllocationDragAsClick|requiresAllocationFragmentExtraction|buildAllocationMovedSnapshot|reconcileOptimisticEntries)\b/,