feat: enable manualSync, commit MFA changes in batches

[schmanu]

What it solves

Without manualSync each factor change is commited by itself.
This causes issues if multiple changes are necessary (i.e. for enabling MFA) as each individual commit could fail and lead to inconsistent states

How this PR fixes it

• Enables manualSync
• Commits changes in logical batches

How to test it

• Create a new fresh signer with a google login
• Go to settings -> signer account
• Set a password
• Change the password / device storage setup
• Login on another browser and recover the account

Checklist

• I've tested the branch on mobile 📱
• I've documented how it affects the analytics (if at all) 📊
• I've written a unit/e2e test for it (if applicable) 🧑‍💻

[github-actions]

Branch preview

✅ Deploy successful!

https://seedless_manual_sync--walletweb.review-wallet-web.5afe.dev

[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

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^{Report generated by eslint-plus-action}