refactor: update DayDetail component and tests for clarity and functionality

- Revised unit tests for DayDetailContent to reflect changes in duty entry display, ensuring only time and name are shown without contact links.
- Updated styling in DayDetail component to enhance visual consistency with background color adjustments.
- Removed unused ContactLinks component from DayDetailContent to streamline the code and improve readability.

webapp-next/src/components/day-detail/DayDetail.test.tsx

@@ -1,5 +1,5 @@
 /**
- * Unit tests for DayDetailContent: sorts duties by start_at, includes contact info.
+ * Unit tests for DayDetailContent: sorts duties by start_at; duty entries show time and name only (no contact links).
  * Ported from webapp/js/dayDetail.test.js buildDayDetailContent.
  */
 
@@ -54,7 +54,7 @@ describe("DayDetailContent", () => {
     expect(ivanovPos).toBeLessThan(petrovPos);
   });
 
-  it("includes contact info (phone, username) for duty entries when present", () => {
+  it("shows duty time and name on one line and does not show contact links", () => {
     const dateKey = "2025-03-01";
     const duties = [
       duty("Alice", "2025-03-01T09:00:00Z", "2025-03-01T17:00:00Z", {
@@ -70,8 +70,8 @@ describe("DayDetailContent", () => {
       />
     );
     expect(screen.getByText("Alice")).toBeInTheDocument();
-    expect(document.querySelector('a[href^="tel:"]')).toBeInTheDocument();
-    expect(document.querySelector('a[href*="t.me"]')).toBeInTheDocument();
-    expect(screen.getByText(/alice_dev/)).toBeInTheDocument();
+    expect(document.querySelector('a[href^="tel:"]')).toBeNull();
+    expect(document.querySelector('a[href*="t.me"]')).toBeNull();
+    expect(screen.queryByText(/alice_dev/)).not.toBeInTheDocument();
   });
 });