lmr: front: rework the addition of intermediate OPs

[axrolld]

Description

Adding an intermediaite OP isn't clear enough for the users, we'd like to make this interaction clearer.

AC

• There should be an automatic scroll if the card exits the view.
• The CI field must be focus after clicking "Add an intermediaite OP"
• The cards appear with an animation (mockup un comment below)

[thibautsailly]

Prototypes available at Sketch > Last Minute Request > Request forme > #9713 - Animating the OP addition

Here is what happens when the new OP card can be displayed in full height in the viewport:

Higher definition screen capture: /~https://github.com/user-attachments/assets/4b1730ff-5f2d-46d0-ac01-2927edcafe7c
Same animation, but slowed down: /~https://github.com/user-attachments/assets/ecb1160c-c65d-4513-9ed5-cb2edcfe2a8a

Here is what happens when the new OP card cannot be displayed in full height in the viewport:

Higher definition screen capture: /~https://github.com/user-attachments/assets/6cc25846-2c60-4647-bb23-ea26e35c08d2
Same animation, but slowed down: /~https://github.com/user-attachments/assets/c425fa84-2076-48b1-959b-218ba04fbc6e

[Arthur-Lefebvre]

01/09/2025 tests results :

The issue is reopenned because it doesn't fullfill all the AC.

• There should be an automatic scroll if the card exits the view.
  This AC is partially satisfied :
• For the first intermediate OP, the automatic scroll works properly
• But after, if you add an intermediate OP in first position, the automatic scroll doesn't work
• Then if you add an intermediate OP, but not the first one, it works
• After this, it works for the first one, but only once
• If you want the scroll for first one to work again, you have to add an intermediate OP which is not the first

See the behavior in the video below :
/~https://github.com/user-attachments/assets/af005e8d-84b3-4849-bcb6-88a102668c8b

• The CI field must be focus after clicking "Add an intermediate OP"
  This AC is not satisfied
• The cards appear with an animation (mockup un comment below)
  This AC is fully satisfied