fix(connect-ui): skip integrations list when only one integration is allowed

[bodinsamuel]

Describe your changes

Fixes https://linear.app/nango/issue/NAN-1787/if-only-one-integrations-allowed-skip-the-list
Fixes https://linear.app/nango/issue/NAN-1892/fix-popup-blocker

• When only integration is allowed skip directly to integration page
• Add an intermediate screen to trigger oauth popup to not fall into popup blocker
• Fix name auth_mode

Tests

npm run dw
npm run dwa
npm run connect-ui:dev:watch

• add this

diff --git a/packages/server/lib/controllers/v1/connect/sessions/postConnectSessions.ts b/packages/server/lib/controllers/v1/connect/sessions/postConnectSessions.ts
index 4c1b2751..a225e855 100644
--- a/packages/server/lib/controllers/v1/connect/sessions/postConnectSessions.ts
+++ b/packages/server/lib/controllers/v1/connect/sessions/postConnectSessions.ts
@@ -21,6 +21,7 @@ export const postInternalConnectSessions = asyncWrapper<PostInternalConnectSessi
     // @ts-expect-error req.body is never but we want to fake it on purpose
     // eslint-disable-next-line @typescript-eslint/no-unsafe-assignment
     req.body = {
+        allowed_integrations: ['algolia']
         end_user: { id: `nango_dashboard_${user.id}`, email: user.email, display_name: user.name }
     } satisfies PostConnectSessions['Body'];

• Open the UI from the dashboard
• It should directly open the integration screen

[linear]

NAN-1787 If only one integrations allowed, skip the list

NAN-1892 Fix popup blocker

[TBonnin]

should we make this condition a const and reuse it below?