EDM modeler doesn't draw cross-model relationships — no arrow to the projection entity

[NicoleNG18]

Describe the bug

Open a generated .edm that references another model (a cross-model relation) in the entity modeler. The projection entity box is drawn, but:

1. No arrow connects it to the owning entity — you see two disconnected boxes, so there's no visual indication that

To Reproduce

1. Create two intent models where one references the other cross-model (a manyToOne/oneToOne with a model: alias, e.g. Employee → Company).
2. Generate, then open the referencing model's .edm in the Entity Data Modeler.
3. Observe the Employee box and the Company projection box drawn as two disconnected boxes — no arrow between them.
4. Observe the Company projection box rendered in the ordinary blue entity color, not the distinct projection style/icon.
5. (Contrast) note a same-model relation such as Employee.Manager renders both an arrow and correct styling.

Expected behavior

A cross-model relation should be visualized like a same-model one: an arrow from the owning entity's FK to the projection entity, and the projection box rendered in the modeler's dedicated PROJECTION style/color and icon, so it's immediately clear the entity is an external cross-model reference.