feat: add LocaleProvider and hooks for managing locale and timezone settings

src/lib/utils/locale.ts

@@ -0,0 +1,14 @@
+// Get supported timezones, fallback to basic list if Intl.supportedValuesOf is not available
+export const getSupportedTimezones = (): string[] => {
+  try {
+    if (typeof Intl !== 'undefined' && 'supportedValuesOf' in Intl) {
+      // eslint-disable-next-line @typescript-eslint/no-explicit-any
+      return (Intl as any).supportedValuesOf('timeZone')
+    }
+  } catch {
+    console.warn('Intl.supportedValuesOf not available, using fallback timezones')
+  }
+  
+  // Fallback timezone list
+  return ['America/New_York', 'Europe/Paris']
+}