Feature Request: Customizable Step Transition Animations in MatStepper

Feature Request: Customizable Step Transition Animations in MatStepper: a task in LegoFlow-SWE (Harbor dataset). Currently, the MatStepper components have fixed, hard‑coded animation durations for step transitions: - Vertical stepper uses a 225 ms animation. - Horizontal stepper uses a 500 ms…

The task

Currently, the **MatStepper** components have fixed, hard‑coded animation durations for step transitions: - **Vertical stepper** uses a **225 ms** animation. - **Horizontal stepper** uses a **500 ms** animation.

Part of Lego-X/LegoFlow-SWE.