[Due for payment 2025-07-22] [Due for payment 2025-07-08] [HOLD FOR #56838] [Standardize the pay button] IOUs

[grgia]

Design Doc Section

⚠️ MERGE HOLD ON BE ⚠️

This section is dependent on:
NVP changes:
#55873 (FE Migration)
https://github.com/Expensify/Expensify/issues/465082 (BE Migration)
https://github.com/Expensify/Expensify/issues/465077 (Setting the NVP)

New Command:
https://github.com/Expensify/Expensify/issues/465092

Goal

Update all pay buttons related to IOUs

Issue Owner

Current Issue Owner: @CortneyOfstad

[melvin-bot]

@hungvu193, @grgia, @getusha Eep! 4 days overdue now. Issues have feelings too...

[hungvu193]

Let's do this first.
@getusha Can you take over and implement this one?

[grgia]

@getusha are you taking this one