Stepper: improves hotkeys

[martin-henz]

Description

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update
• Code quality improvements

How to test

Go here
https://b8be6114.cadet-frontend.pages.dev
and play with the stepper:
a: Move to the first step
e: Move to the last step
f: Move to the next step
b: Move to the previous step

Note that these shortcuts are only active when the browser focus is on the stepper tab (click on or above the explanation text).

Checklist

• I have tested this code
• I have updated the documentation

[cloudflare-pages]

Deploying with    Cloudflare Pages

Latest commit:	6e165b1
Status:	✅  Deploy successful!
Preview URL:	https://b8be6114.cadet-frontend.pages.dev

View logs

[coveralls]

Pull Request Test Coverage Report for Build 957617377

• 0 of 5 (0.0%) changed or added relevant lines in 1 file are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage decreased (-0.01%) to 30.073%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
src/commons/sideContent/SideContentSubstVisualizer.tsx	0	5	0.0%

Files with Coverage Reduction	New Missed Lines	%
src/commons/sideContent/SideContentSubstVisualizer.tsx	1	1.62%

Totals
Change from base Build 957608250:	-0.01%
Covered Lines:	3208
Relevant Lines:	9826

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💛 - Coveralls