fix: Track safe creation events under the same category

[usame-algan]

What it solves

Related to #968

How this PR fixes it

• The vertical tx stepper passes the category parameter so that the creation flow uses the same eventCategory as the new safe creation flow

How to test it

1. Open the safe with the AB test set to false
2. Navigate to /welcome
3. Create a new safe
4. Observe that the GTM events include eventCategory: create-safe instead of modal

Analytics changes

• This will track all safe creation events under the same eventCategory

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Branch preview

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https://fix-create-safe-events--webcore.review-web-core.5afe.dev

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ESLint Summary View Full Report

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Type	Occurrences	Fixable
Errors	0	0
Warnings	0	0
Ignored	0	N/A

• Result: ✅ success
• Annotations: 0 total

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^{Report generated by eslint-plus-action}

[katspaugh]

Tested, the categories are correct. ✅