Decouple twenty-ui Avatar from app server-URL config (#21968)

Makes `twenty-ui`'s `Avatar` render the `avatarUrl` it receives instead
of building it from `window._env_`/`window.location` at module load, so
the library no longer depends on the app environment. URL resolution
moves to `twenty-front` via a `getAbsoluteImageUrl` helper applied at
the call sites.

Part of making twenty-ui a standalone library.

packages/twenty-front/src/utils/image/__tests__/getAbsoluteImageUrl.test.ts

@@ -0,0 +1,31 @@
+import { getAbsoluteImageUrl } from '~/utils/image/getAbsoluteImageUrl';
+
+jest.mock('~/config', () => ({
+  REACT_APP_SERVER_BASE_URL: 'https://example.com',
+}));
+
+describe('getAbsoluteImageUrl', () => {
+  it('returns undefined for nullish or empty input', () => {
+    expect(getAbsoluteImageUrl(undefined)).toBeUndefined();
+    expect(getAbsoluteImageUrl(null)).toBeUndefined();
+    expect(getAbsoluteImageUrl('')).toBeUndefined();
+  });
+
+  it('returns absolute http(s) URLs unchanged', () => {
+    expect(getAbsoluteImageUrl('https://cdn.example.com/avatar.png')).toBe(
+      'https://cdn.example.com/avatar.png',
+    );
+    expect(getAbsoluteImageUrl('http://cdn.example.com/avatar.png')).toBe(
+      'http://cdn.example.com/avatar.png',
+    );
+  });
+
+  it('resolves relative paths against the server base URL under /files', () => {
+    expect(getAbsoluteImageUrl('avatars/avatar.png')).toBe(
+      'https://example.com/files/avatars/avatar.png',
+    );
+    expect(getAbsoluteImageUrl('/avatars/avatar.png')).toBe(
+      'https://example.com/files/avatars/avatar.png',
+    );
+  });
+});

packages/twenty-front/src/utils/image/getAbsoluteImageUrl.ts

@@ -0,0 +1,11 @@
+import { isNonEmptyString } from '@sniptt/guards';
+import { getImageAbsoluteURI } from 'twenty-shared/utils';
+
+import { REACT_APP_SERVER_BASE_URL } from '~/config';
+
+export const getAbsoluteImageUrl = (
+  imageUrl?: string | null,
+): string | undefined =>
+  isNonEmptyString(imageUrl)
+    ? getImageAbsoluteURI({ imageUrl, baseUrl: REACT_APP_SERVER_BASE_URL })
+    : undefined;