Add keyboard and visual navigation between applications in modal

[Copilot]

Adds ability to navigate between applications in the details modal using arrow keys and visual chevron buttons.

Changes

ApplicationDetailsModal

• Keyboard navigation via arrow keys (← previous, → next) with event listener that respects input/textarea/contenteditable focus
• Visual chevron buttons positioned absolutely on modal sides with backdrop blur
• Position indicator badge showing "current / total" count
• New props: onNavigateNext, onNavigatePrevious, canNavigateNext, canNavigatePrevious, currentIndex, totalCount

Home page

• Track selectedApplicationIndex alongside selected application
• Navigation handlers update both index and application state atomically
• Post-vote behavior: auto-advance to next application (or previous if voting on last), close modal when list empty
• Index validation after filtering voted application from array

<ApplicationDetailsModal
  application={selectedApplication}
  onNavigateNext={handleNavigateNext}
  onNavigatePrevious={handleNavigatePrevious}
  canNavigateNext={selectedApplicationIndex < applications.length - 1}
  canNavigatePrevious={selectedApplicationIndex > 0}
  currentIndex={selectedApplicationIndex}
  totalCount={applications.length}
/>

Navigation arrows conditionally render and disable at boundaries. Keyboard events preventDefault to avoid scroll interference.

Original prompt

Quiero que por favor agregues la posibilidad de con las teclas de flechas y una flecha a los lados de los modales poder cambiar entre postulaciones.

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