feat(citas): Mejora del sistema de validación de agendamiento

Merge branch 'main' of https://github.com/Yeyobitz/Pochita

style: mejora diseño y usabilidad de formularios

agregue que el nombre de usuario y contraseña no se repitan en la creacion de usuario

generar boton de eliminar en facturacion

Refactor billing views and templates: add delete functionality for invoices, update URL patterns, and enhance access control for invoice viewing and creation. Update styles for delete button and improve invoice listing display based on user roles.

Remove unnecessary padding and wrapper styles from CSS

Merge branch 'main' of https://github.com/Yeyobitz/Pochita

Medical records css + fix

Refactor templates and styles for improved layout and design consistency

Merge branch 'main' of https://github.com/Yeyobitz/Pochita

Remove billing header

Remove default heading text from base template

wooter test

Merge branch 'main' of https://github.com/Yeyobitz/Pochita