Small refactoring to later support deleting accounts

[lukaw3d]

(this is more resilient in case state gets incorrectly modified)

[github-actions]

🦙 MegaLinter status: ✅ SUCCESS

Descriptor	Linter	Files	Fixed	Errors	Elapsed time
✅ EDITORCONFIG	editorconfig-checker	19		0	0.15s
✅ REPOSITORY	checkov	yes		no	43.7s
✅ REPOSITORY	git_diff	yes		no	0.02s
✅ REPOSITORY	grype	yes		no	18.81s
✅ REPOSITORY	trivy-sbom	yes		no	2.68s
✅ REPOSITORY	trufflehog	yes		no	172.16s
✅ TSX	eslint	12	0	0	9.55s
✅ TYPESCRIPT	eslint	7	0	0	8.17s

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[cloudflare-pages]

Deploying with    Cloudflare Pages

Latest commit:	3ce9a84
Status:	✅  Deploy successful!
Preview URL:	https://9e947f4c.oasis-wallet.pages.dev
Branch Preview URL:	https://lw-to-support-deleting-acc.oasis-wallet.pages.dev

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[codecov]

Codecov Report

Merging #1624 (3f432b3) into master (8dfbaec) will decrease coverage by 0.04%.
The diff coverage is 86.84%.

❗ Current head 3f432b3 differs from pull request most recent head 3ce9a84. Consider uploading reports for the commit 3ce9a84 to get more accurate results

@@            Coverage Diff             @@
##           master    #1624      +/-   ##
==========================================
- Coverage   82.98%   82.95%   -0.04%     
==========================================
  Files         157      157              
  Lines        4085     4089       +4     
  Branches      731      733       +2     
==========================================
+ Hits         3390     3392       +2     
- Misses        695      697       +2     

Flag	Coverage Δ
cypress	51.06% <83.87%> (+0.01%)	⬆️
jest	77.99% <73.68%> (-0.08%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files Changed	Coverage Δ
src/app/state/wallet/index.ts	94.44% <ø> (-0.30%)	⬇️
src/app/state/selectUnlockedStatus.ts	64.28% <58.33%> (+2.74%)	⬆️
src/app/components/Footer/index.tsx	90.90% <100.00%> (ø)
...rc/app/components/MobileFooterNavigation/index.tsx	97.14% <100.00%> (ø)
src/app/components/Sidebar/index.tsx	88.88% <100.00%> (ø)
...s/Toolbar/Features/AccountSelectorButton/index.tsx	95.65% <100.00%> (-4.35%)	⬇️
src/app/components/Toolbar/index.tsx	100.00% <100.00%> (ø)
...ages/AccountPage/Features/AccountSummary/index.tsx	100.00% <100.00%> (ø)
src/app/pages/AccountPage/index.tsx	97.40% <100.00%> (ø)
src/app/state/selectIsAddressInWallet.ts	100.00% <100.00%> (ø)
... and 1 more

... and 4 files with indirect coverage changes