add items per wagon map to cargo types and sync bulk rate units

- Implemented  in the  to manage the physical item capacity for each wagon type.
- Added a new migration to create the  column in the  table.
- Introduced  method in  to update rate units when cargo type unit of measure changes.
- Updated booking calculations to consider items per wagon for break-bulk cargo.
- Refactored various components to utilize the new items fit logic and ensure consistent date formatting across the application.
- Added tests for the new display timezone functionality to ensure consistent date/time representation across different user settings.

apps/edr-freight-web/backoffice/src/lib/display-timezone.test.ts

@@ -0,0 +1,41 @@
+import { describe, expect, it } from "vitest";
+
+import "@edr/ui-common/display-timezone";
+
+// The pin must hold on ANY machine timezone — these assertions are the bug:
+// before the patch they only passed on a PC already set to UTC+3.
+describe("display-timezone pin (EAT, UTC+3)", () => {
+  const utcMidnight = new Date("2026-01-01T00:00:00Z");
+
+  it("formats Date.toLocale* in EAT regardless of machine timezone", () => {
+    expect(utcMidnight.toLocaleTimeString("en-GB", { hour12: false })).toBe(
+      "03:00:00",
+    );
+    // 22:00 UTC is already the NEXT day in EAT.
+    expect(new Date("2026-01-01T22:00:00Z").toLocaleDateString("en-CA")).toBe(
+      "2026-01-02",
+    );
+  });
+
+  it("formats Intl.DateTimeFormat in EAT and keeps instanceof/statics", () => {
+    const fmt = new Intl.DateTimeFormat("en-GB", {
+      hour: "2-digit",
+      minute: "2-digit",
+      hour12: false,
+    });
+    expect(fmt.format(utcMidnight)).toBe("03:00");
+    expect(fmt).toBeInstanceOf(Intl.DateTimeFormat);
+    expect(Intl.DateTimeFormat.supportedLocalesOf(["en-GB"])).toContain(
+      "en-GB",
+    );
+  });
+
+  it("respects an explicit timeZone option", () => {
+    expect(
+      utcMidnight.toLocaleTimeString("en-GB", {
+        hour12: false,
+        timeZone: "UTC",
+      }),
+    ).toBe("00:00:00");
+  });
+});