feat: implement theme customization and user preferences

- Added support for user-selected themes, allowing users to customize the appearance of the application.
- Introduced a new `temaPreferido` field in the user schema to store the preferred theme.
- Updated various components to apply the selected theme dynamically based on user preferences.
- Enhanced the UI to include a theme selection interface, enabling users to preview and save their theme choices.
- Implemented a polyfill for BlobBuilder to ensure compatibility across browsers, improving the functionality of the application.

packages/backend/convex/schema.ts

@@ -552,6 +552,7 @@ export default defineSchema({
     ultimaAtividade: v.optional(v.number()), // timestamp
     notificacoesAtivadas: v.optional(v.boolean()),
     somNotificacao: v.optional(v.boolean()),
+    temaPreferido: v.optional(v.string()), // tema de aparência escolhido pelo usuário
   })
     .index("by_email", ["email"])
     .index("by_role", ["roleId"])