Restoring Odoo's native d-none d-md-flex hide on .o_menu_sections
(previous commit) revealed its own built-in "All Apps" mobile burger
menu, which already lists the full Education app sections (Dashboard,
Master Data, Students, ...) in its native drawer. The custom
off-canvas sidebar + hamburger toggle added in the previous commit
duplicated that, showing two hamburgers in the mobile header. Drop
the custom toggle/backdrop and just hide the custom sidebar below
768px, deferring entirely to Odoo's native mobile menu.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
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