Parent Issue

Subtask of #1083

Problem

LocaleSwitcher only accepts string[]. Need support for { en: "English" } and rich configs.

Requirements

1. Add Types

export type LocaleConfig = {
  code: string;
  displayName: string;
  flag?: string;
  nativeName?: string;
};

export type LocalesProp = 
  | string[]
  | Record<string, string>
  | LocaleConfig[];

2. Add Normalization Function

function normalizeLocales(locales: LocalesProp): LocaleConfig[]

Must handle all 3 input formats and return consistent LocaleConfig[].

3. Update LocaleSwitcherProps

Replace locales: string[] with locales: LocalesProp.

Acceptance Criteria

• ["en", "es"] works unchanged
• { en: "English", es: "Español" } shows custom names
• [{ code: "en", displayName: "English" }] works
• Invalid configs throw descriptive errors
• Unit tests for all 3 input formats
• TypeScript inference works correctly

Tests Required

• String array input
• Object input
• LocaleConfig array input
• Mixed/invalid inputs
• Type inference

Must complete first - other subtasks depend on these types.