Format an error into a user-friendly message string.
The message and the context label are each masked before a suffix is appended: a secret a bank's snippet cut off hides the rest of the text it is masked in, so masking the whole string later would hide the advice too.
The error to format.
Optional context label appended in parentheses.
A formatted string with icon, label, and error detail.
Formats Error objects into human-readable notification strings.