Replaces four inconsistent error display patterns with the centralized
showError()/hideError() helpers from helpers.js:
- approval.js: replace direct classList toggling on approve-tx-error and
approve-sign-error with showError()/hideError()
- addressDetail.js: rename export-privkey-flash to export-privkey-error,
use showError()/hideError() instead of direct DOM manipulation
- deleteWallet.js: rename delete-wallet-flash to delete-wallet-error,
use showError()/hideError() instead of direct DOM with text-red-500
- addWallet.js: replace showFlash() validation errors with dedicated
add-wallet-error div and showError() (keep showFlash for status msgs)
- importKey.js: replace showFlash() validation errors with dedicated
import-key-error div and showError()
- index.html: add error divs with min-h-[1.25rem] for add-wallet,
import-key views; update existing error divs to use consistent
min-h-[1.25rem] class instead of hidden class
Closes#87
