• Update package status from experimental to preview.
• Update package:icu4x to 2.3.1.
• Add Locale.maximize, Locale.minimize, and Locale.canonicalize methods.
• Fix ECMA supportedLocalesOf implementation for WebAssembly compatibility.
• Expose Locale subtag getters (language, region, script) and equality.
• Add calendar.dart entrypoint exposing Calendar and Weekday with Weekday.firstDayOfWeek API.
• Add formatRange method to DateTimeFormat.
• Add more DateTimeFormats.
• Update PluralRules.select to select from plural form options.
• Add doc examples using dartdoc {@example} directive.