[Stepper Item] Reduce block padding

[SkyeSeitz]

Check existing issues

• I have checked for existing issues to avoid duplicates

Description

Per discussion in #10717 (comment), there is a bit of excessive height on all Stepper Item scales.

With issue #7623, the gap between heading and description would be removed, however the line-heights would increase slightly. Reducing the block padding could benefit Stepper Item whether it happens before or after changes in 7623.

Acceptance Criteria

Reduce block padding:
SM 16px →12px (space.md)

MD 20px → 16px (space.lg)

LG 24px → 20px (space.xl)

🔗 Figma specs: https://www.figma.com/design/7HKESXFvg1H0tpiAZO6hCH/Template-(Copy)?node-id=1501-934&m=dev

Relevant Info

cc @macandcheese @aaron

Which Component

Stepper Item

Example Use Case

No response

Priority impact

impact - p3 - not time sensitive

Calcite package

• @esri/calcite-components
• @esri/calcite-components-react
• @esri/calcite-design-tokens
• @esri/eslint-plugin-calcite-components

Esri team

Calcite (design)