bug(stepper): Whitespace on empty label

[jonas-menne]

Is this a regression?

• Yes, this behavior used to work in the previous version

The previous version in which this bug was not present was

No response

Description

When creating a stepper without a label it still leaves space for a label resulting in a unnessecary trailing whitespace next to the number.

I know there is a css workaround for this issue but imo it should look okay from the start.

Reproduction

StackBlitz link: https://stackblitz.com/edit/ay62zu8f?file=src%2Fexample%2Fstepper-overview-example.html
Steps to reproduce:

1. Create a Stepper without a label

Expected Behavior

Theres a whitespace after the number.

Actual Behavior

A whitespace next to the numbers, resulting in a break of Line.

Environment

• Angular: 20.1.0
• CDK/Material: 20.1.0
• Browser(s): Edge
• Operating System (e.g. Windows, macOS, Ubuntu): Windows