[Messenger] fix Studio widget not rendering in navigation

[dpfaffenbauer]

Problem

Opening the Messenger entry from the Pimcore Studio main navigation renders an empty widget showing only the label (coreshop_messenger) instead of the real MessengerList UI.

Cause

The Studio menu bridge in CoreShopMenuBundle (menu-extension.tsx) derives the widget id for a leaf menu item as:

const widgetId = item.widgetId || `coreshop-${item.id}`

The messenger menu item (MessengerMenuBuilder) did not set a widgetId attribute, so the bridge computed coreshop-coreshop_messenger. That id does not match the widget the messenger Studio plugin actually registers:

widgetRegistryService.registerWidget({ name: 'coreshop-messenger-widget', component: MessengerList })

Because no widget is registered under the computed id, the bridge falls back to its placeholder CoreShopWidget, which only renders the item label — hence the empty screen. (After linking works, a leftover persisted tab may throw Widget coreshop-coreshop_messenger not found once, which is the stale pre-fix tab.)

Fix

Set the widgetId attribute on the messenger menu item to the id the Studio plugin registers, so the navigation entry resolves to the real widget:

->setAttribute('widgetId', 'coreshop-messenger-widget')

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