refactor(api): align timeline project read routing

packages/api/src/__tests__/timeline-project-procedure-support.test.ts

@@ -41,6 +41,7 @@ import {
 } from "../router/timeline-project-query-support.js";
 import {
   readTimelineProjectBudgetStatusResponse,
+  readTimelineProjectShiftPreview,
   readTimelineProjectShiftPreviewDetail,
 } from "../router/timeline-project-procedure-support.js";
 
@@ -89,6 +90,24 @@ describe("timeline project procedure support", () => {
     });
   });
 
+  it("loads plain shift preview responses through procedure support", async () => {
+    previewTimelineProjectShiftMock.mockResolvedValueOnce({ valid: true } as never);
+
+    await expect(
+      readTimelineProjectShiftPreview({} as never, {
+        projectId: "project_1",
+        newStartDate: new Date("2026-04-03T00:00:00.000Z"),
+        newEndDate: new Date("2026-04-12T00:00:00.000Z"),
+      }),
+    ).resolves.toEqual({ valid: true });
+
+    expect(previewTimelineProjectShiftMock).toHaveBeenCalledWith({}, {
+      projectId: "project_1",
+      newStartDate: new Date("2026-04-03T00:00:00.000Z"),
+      newEndDate: new Date("2026-04-12T00:00:00.000Z"),
+    });
+  });
+
   it("builds budget status responses from project bookings", async () => {
     findTimelineProjectOrThrowMock.mockResolvedValueOnce({
       id: "project_1",

packages/api/src/__tests__/timeline-read-shared.test.ts

@@ -3,6 +3,7 @@ import {
   buildTimelineEntriesDetailInput,
   TimelineDetailFiltersSchema,
   TimelineProjectContextDetailSchema,
+  TimelineProjectIdSchema,
 } from "../router/timeline-read-shared.js";
 
 describe("timeline read shared", () => {
@@ -68,5 +69,11 @@ describe("timeline read shared", () => {
       endDate: "2026-04-20",
       durationDays: undefined,
     });
+
+    expect(TimelineProjectIdSchema.parse({
+      projectId: "project_1",
+    })).toEqual({
+      projectId: "project_1",
+    });
   });
 });