web: readable sync error message

[TalDerei]

Description of Changes

Previously, syncing displayed varying illegible error states (eg. ConnectError and DataCloneError). These can be caused by unstable internet connections, locking the wallet which resets the service worker for security, etc. The error handling has been improved to provide a clearer error message and programmatically reload the page with window.location.reload() every 5s when a sync error occurs.

update: because of the investigation in #1885 (comment), this PR simply just makes the error messaging nicer rather than doing any auto page reloading.

Related Issue

references #1378 and #1898

pairs with prax-wallet/prax#278

Checklist Before Requesting Review

• I have ensured that any relevant minifront changes do not cause the existing extension to break.

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Latest commit: d96a7fe

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