refactor(web): extract range selection bootstrap

apps/web/src/hooks/timelineRangeSelection.test.ts

@@ -1,5 +1,5 @@
 import { describe, expect, it } from "vitest";
-import { finalizeRangeSelection, updateRangeSelectionDraft } from "./timelineRangeSelection.js";
+import { createRangeSelectionState, finalizeRangeSelection, updateRangeSelectionDraft } from "./timelineRangeSelection.js";
 
 type TestRangeState = {
   isSelecting: boolean;
@@ -11,6 +11,23 @@ type TestRangeState = {
 };
 
 describe("timelineRangeSelection", () => {
+  it("creates a selection draft with currentDate anchored to the start date", () => {
+    expect(
+      createRangeSelectionState<TestRangeState>(
+        "res-1",
+        new Date("2025-01-15T12:00:00.000Z"),
+        100,
+      ),
+    ).toEqual({
+      isSelecting: true,
+      resourceId: "res-1",
+      startDate: new Date("2025-01-15T12:00:00.000Z"),
+      currentDate: new Date("2025-01-15T12:00:00.000Z"),
+      suggestedProjectId: null,
+      startClientX: 100,
+    });
+  });
+
   it("ignores updates when no full day boundary was crossed", () => {
     const state: TestRangeState = {
       isSelecting: true,