- Fix malformed class attribute on tab buttons container (was breaking
pb-4 mb-8 dark:border-slate-800 classes; tab buttons sat glued to
content with no spacing)
- Move 'Trabajo Anterior' details back inside #tab-proyectos where it
belongs (had been orphaned into #tab-contents after earlier balance
fixes, causing it to render on every tab)
- Close tab-proyectos correctly so Proyectos and Notes panes show their
own content instead of inheriting display:none from Infraestructura
- initTabs() now scrolls smoothly to the tab buttons container on switch
to prevent the 'jump' caused by varying content height
