fix: Store newly created safe

[usame-algan]

What it solves

Resolves #1121

How this PR fixes it

We were using pendingSafe.address instead of pendingSafe.safeAddress. I opted against refactoring the types to keep this PR small but added a TODO.

How to test it

1. Create a new safe
2. Observe that it is being added to the added safes list

[github-actions]

ESLint Summary View Full Report

Annotations are provided inline on the Files Changed tab. You can also see all annotations that were generated on the annotations page.

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

• Result: ✅ success
• Annotations: 0 total

---

^{Report generated by eslint-plus-action}

[cloudflare-workers-and-pages]

Deploying with    Cloudflare Pages

Latest commit:	bb4a7c1
Status:	✅  Deploy successful!
Preview URL:	https://0515a48d.web-core.pages.dev
Branch Preview URL:	https://create-safe-add-entry.web-core.pages.dev

View logs

[katspaugh]

👍