normalizeUnicodeNfc method
Normalizes to NFC (canonical composition) for comparison and storage.
This package does not depend on intl; this method returns the string unchanged.
For full NFC/NFD normalization, use package:intl or package:unorm_dart in your app.
Example:
'café'.normalizeUnicodeNfc(); // returns 'café' (no-op without intl)
Implementation
@useResult
String normalizeUnicodeNfc() => this;