fix(dashboard): remove country flags from language picker (#29997)

Closes #29750. Reporter flagged that 繁體中文 displayed the TW flag
instead of the PRC flag. Rather than picking a side, drop the
language-flag pairings entirely — languages aren't countries
(English ≠ GB, Portuguese ≠ PT, Mandarin variants ≠ any single
jurisdiction), and endonyms are unambiguous.

- LOCALE_META: strip flagCountryCode field
- LanguageSwitcher: remove LocaleFlagIcon component + both call sites
- main.tsx: drop flag-icons CSS import
- package.json: uninstall flag-icons

web/src/i18n/context.tsx

@@ -37,27 +37,31 @@ const TRANSLATIONS: Record<Locale, Translations> = {
 };
 
 // Display metadata for the language picker — endonym (native name) so users
-// recognize their language even if they don't speak the current UI language,
-// plus a flag-icons sprite (ISO 3166-1 alpha-2) for visual scanning.
+// recognize their language even if they don't speak the current UI language.
 // Exposed as a constant so the LanguageSwitcher and any future settings page
 // can share the same list.
-export const LOCALE_META: Record<Locale, { name: string; flagCountryCode: string }> = {
-  en: { name: "English", flagCountryCode: "gb" },
-  zh: { name: "简体中文", flagCountryCode: "cn" },
-  "zh-hant": { name: "繁體中文", flagCountryCode: "tw" },
-  ja: { name: "日本語", flagCountryCode: "jp" },
-  de: { name: "Deutsch", flagCountryCode: "de" },
-  es: { name: "Español", flagCountryCode: "es" },
-  fr: { name: "Français", flagCountryCode: "fr" },
-  tr: { name: "Türkçe", flagCountryCode: "tr" },
-  uk: { name: "Українська", flagCountryCode: "ua" },
-  af: { name: "Afrikaans", flagCountryCode: "za" },
-  ko: { name: "한국어", flagCountryCode: "kr" },
-  it: { name: "Italiano", flagCountryCode: "it" },
-  ga: { name: "Gaeilge", flagCountryCode: "ie" },
-  pt: { name: "Português", flagCountryCode: "pt" },
-  ru: { name: "Русский", flagCountryCode: "ru" },
-  hu: { name: "Magyar", flagCountryCode: "hu" },
+//
+// We intentionally do NOT pair locales with country flags. Languages are not
+// countries (English ≠ GB, Portuguese ≠ PT, Spanish ≠ ES, Chinese variants ≠
+// any single jurisdiction). Endonyms are unambiguous and avoid the political
+// mismapping that flag pairings inevitably create.
+export const LOCALE_META: Record<Locale, { name: string }> = {
+  en: { name: "English" },
+  zh: { name: "简体中文" },
+  "zh-hant": { name: "繁體中文" },
+  ja: { name: "日本語" },
+  de: { name: "Deutsch" },
+  es: { name: "Español" },
+  fr: { name: "Français" },
+  tr: { name: "Türkçe" },
+  uk: { name: "Українська" },
+  af: { name: "Afrikaans" },
+  ko: { name: "한국어" },
+  it: { name: "Italiano" },
+  ga: { name: "Gaeilge" },
+  pt: { name: "Português" },
+  ru: { name: "Русский" },
+  hu: { name: "Magyar" },
 };
 
 const SUPPORTED_LOCALES = Object.keys(TRANSLATIONS) as Locale[];