fix: only delete all preferences per chain

[iamacook]

What it solves

Resolves #2546 (comment)

How this PR fixes it

deleteAllPreferences is has been replaced with deleteAllChainPreferences, which clears preferences according to a provided chainId according to the device unregistration (also per chainId).

A loading indicator has also been added to the global preferences "Save" button.

How to test it

During the following registrations, a loading indicator should appear in the "Save" button:

1. Ensure multiple Safes are registered across differing chains.
2. Navigate to the global notification preferences.
3. Unregister a Safe.
4. Observe only the preferences from that Safe removed.

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1. Ensure multiple Safes are registered across differing chains.
2. Navigate to the global notification preferences.
3. Unregister all Safes on one network.
4. Observe the Safes on other chain(s) retain their preferences.

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]

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

[iamacook]

I noticed that these were labelled incorrectly.

[github-actions]

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}

[francovenica]

Looks good.

Checked that only the checkboxes you check or unchecked are saved
Checked that last fix regarding the signature counter, now it counts properly how many signatures per network you need.