refactor(web): centralize touch mouse adapters

apps/web/src/hooks/timelineTouch.ts

@@ -9,6 +9,15 @@ export type TouchDecisionState = {
   decided: boolean;
 };
 
+export type TouchMouseDownEvent = {
+  button: number;
+  clientX: number;
+  currentTarget?: EventTarget | null;
+  shiftKey: boolean;
+  preventDefault: () => void;
+  stopPropagation: () => void;
+};
+
 type TouchLike = {
   clientX: number;
   clientY: number;
@@ -27,6 +36,20 @@ export function getTouchPoint(event: TouchEventLike): TouchPoint {
   };
 }
 
+export function createTouchMouseDownEvent(
+  point: TouchPoint,
+  currentTarget?: EventTarget | null,
+): TouchMouseDownEvent {
+  return {
+    button: 0,
+    clientX: point.clientX,
+    currentTarget: currentTarget ?? null,
+    shiftKey: false,
+    preventDefault: () => {},
+    stopPropagation: () => {},
+  };
+}
+
 export function resolveTouchDragDecision(
   state: TouchDecisionState,
   point: TouchPoint,