Navbar with AI chats (#18161)

## Summary
Add Home/Chat tabs and a dedicated threads list in the navigation
drawer.

## Changes
- **Navbar tabs:** Tabs in the drawer to switch between Home and Chat
(with “New chat” button). Shown on desktop when expanded and on mobile
below the workspace selector.
- **Navbar threads list:** New `NavigationDrawerAIChatThreadsList` for
the Chat tab with date groups (Today / Yesterday / Older), thread rows
as `NavigationDrawerItem` (IconComment, title, timestamp). Shared
`useAIChatThreadClick` hook used by navbar and command menu; navbar
passes `resetNavigationStack: true`.
- **NavigationDrawerItem:** New `alwaysShowRightOptions` prop so the
timestamp is always visible (no hover-only).

---------

Co-authored-by: Etienne <45695613+etiennejouan@users.noreply.github.com>
Co-authored-by: Félix Malfait <felix@twenty.com>
Co-authored-by: Charles Bochet <charles@twenty.com>

packages/twenty-front/src/utils/__tests__/date-utils.test.ts

@@ -10,6 +10,7 @@ import {
   beautifyExactDate,
   beautifyExactDateTime,
   beautifyPastDateRelativeToNow,
+  beautifyPastDateRelativeToNowShort,
   hasDatePassed,
   parseDate,
 } from '~/utils/date-utils';
@@ -122,6 +123,66 @@ describe('beautifyPastDateRelativeToNow', () => {
   });
 });
 
+describe('beautifyPastDateRelativeToNowShort', () => {
+  it('should return "now" for dates less than 60 seconds ago', () => {
+    const result = beautifyPastDateRelativeToNowShort(
+      '2023-12-31T23:59:15.000Z',
+    );
+    expect(result).toBe('now');
+  });
+
+  it('should return minutes format', () => {
+    const result = beautifyPastDateRelativeToNowShort(
+      '2023-12-31T23:55:00.000Z',
+    );
+    expect(result).toBe('5m');
+  });
+
+  it('should return hours format', () => {
+    const result = beautifyPastDateRelativeToNowShort(
+      '2023-12-31T22:00:00.000Z',
+    );
+    expect(result).toBe('2h');
+  });
+
+  it('should return days format', () => {
+    const result = beautifyPastDateRelativeToNowShort(
+      '2023-12-29T00:00:00.000Z',
+    );
+    expect(result).toBe('3d');
+  });
+
+  it('should return weeks format', () => {
+    const result = beautifyPastDateRelativeToNowShort(
+      '2023-12-18T00:00:00.000Z',
+    );
+    expect(result).toBe('2w');
+  });
+
+  it('should return months format', () => {
+    const result = beautifyPastDateRelativeToNowShort(
+      '2023-08-01T00:00:00.000Z',
+    );
+    expect(result).toBe('5mo');
+  });
+
+  it('should return years format', () => {
+    const result = beautifyPastDateRelativeToNowShort(
+      '2022-01-01T00:00:00.000Z',
+    );
+    expect(result).toBe('2y');
+  });
+
+  it('should return empty string and log error for invalid date', () => {
+    const result = beautifyPastDateRelativeToNowShort('invalid-date-string');
+
+    expect(logError).toHaveBeenCalledWith(
+      Error('Invalid date passed to formatPastDate: "invalid-date-string"'),
+    );
+    expect(result).toBe('');
+  });
+});
+
 describe('hasDatePassed', () => {
   it('should log an error and return false when passed an invalid date string', () => {
     const result = hasDatePassed('invalid-date-string');