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/date-utils.ts

@@ -115,6 +115,43 @@ export const beautifyPastDateRelativeToNow = (
   }
 };
 
+export const beautifyPastDateRelativeToNowShort = (
+  pastDate: Date | string | number,
+) => {
+  try {
+    const parsedDate = parseDate(pastDate);
+    const now = new Date();
+    const diffInSeconds = Math.abs(
+      (now.getTime() - parsedDate.getTime()) / 1000,
+    );
+
+    if (diffInSeconds < 60) return t`now`;
+
+    const diffInMinutes = Math.floor(diffInSeconds / 60);
+    if (diffInMinutes < 60) return `${diffInMinutes}m`;
+
+    const diffInHours = Math.floor(diffInMinutes / 60);
+    if (diffInHours < 24) return `${diffInHours}h`;
+
+    const diffInDays = Math.floor(diffInHours / 24);
+    if (diffInDays < 7) return `${diffInDays}d`;
+
+    const diffInWeeks = Math.floor(diffInDays / 7);
+    if (diffInWeeks < 5) return `${diffInWeeks}w`;
+
+    const diffInMonths = Math.floor(diffInDays / 30);
+    if (diffInMonths < 12) return `${diffInMonths}mo`;
+
+    const diffInYears = Math.floor(diffInDays / 365);
+
+    return `${diffInYears}y`;
+  } catch (error) {
+    logError(error);
+
+    return '';
+  }
+};
+
 export const hasDatePassed = (date: Date | string | number) => {
   try {
     const parsedDate = parseDate(date);