feat: Revamp navigation bar (#6031)

closes: #4428

Testing for fetchMoreRecords is pending, along with component tests

---------

Co-authored-by: Lucas Bordeau <bordeau.lucas@gmail.com>

packages/twenty-ui/src/utilities/index.ts

@@ -1,3 +1,4 @@
 export * from './color/utils/stringToHslColor';
+export * from './isDefined';
 export * from './state/utils/createState';
 export * from './types/Nullable';

packages/twenty-ui/src/utilities/isDefined.ts

@@ -0,0 +1,4 @@
+import { isNull, isUndefined } from '@sniptt/guards';
+
+export const isDefined = <T>(value: T | null | undefined): value is T =>
+  !isUndefined(value) && !isNull(value);