fix(i18n+settings): rename pt-BR→pt, fix theme/locale persistence

Root cause: user_settings table was missing theme, locale, font_family,
font_size columns — PocketBase silently dropped them on every save.
Added the four columns via PocketBase API.

Also:
- listOne now sorts by -updated so the most-recent settings record wins
- PARAGLIDE_LOCALE cookie is now cleared when switching back to English
- pt-BR renamed to pt throughout (messages, inlang settings, validLocales)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

ui/src/hooks.server.ts

@@ -141,7 +141,7 @@ export function parseAuthToken(token: string): { id: string; username: string; r
 // ─── Hook ─────────────────────────────────────────────────────────────────────
 
 function getTextDirection(locale: string): string {
-	// All supported locales (en, ru, id, pt-BR, fr) are LTR
+	// All supported locales (en, ru, id, pt, fr) are LTR
 	return 'ltr';
 }