[explorer] feat: Display remote account in explorer account and transaction details

[cryptoBeliever]

Summary

• show remote account data in account details and transaction details UI
• use transaction payload data for ACCOUNT_KEY_LINK remote address handling
• update API/unit tests to match the new payload flow

Closes: #2355

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.94%. Comparing base (1e21743) to head (69c2299).
⚠️ Report is 1 commits behind head on dev.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #2387      +/-   ##
==========================================
- Coverage   96.94%   96.94%   -0.01%     
==========================================
  Files         276      276              
  Lines       21302    21312      +10     
  Branches      206      206              
==========================================
+ Hits        20651    20660       +9     
- Misses        645      646       +1     
  Partials        6        6              

Flag	Coverage Δ
explorer-frontend	94.87% <100.00%> (-0.01%)	⬇️

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

Files with missing lines	Coverage Δ
explorer/frontend/api/transactions.js	99.74% <100.00%> (-0.26%)	⬇️
explorer/frontend/pages/accounts/[address].jsx	99.66% <100.00%> (+<0.01%)	⬆️

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