feat(ui): make dashboard responsive for iPhone and mobile devices

- Add Sheet primitive component for mobile drawers
- Add MobileNav with hamburger menu for dashboard layout
- Hide desktop sidebars on mobile; show mobile header
- Make dashboard header responsive with stacked layout on small screens
- Hide selector text on mobile, show icons only
- Convert fixed-width filters to responsive widths (CFDI, Clientes, Admin, Documentos, Alertas)
- Cap dialog widths to 95vw on mobile (CFDI viewer, Documentos, Reportes, Contribuyentes, Facturación)
- Make calendar grid smaller and use single-letter weekdays on mobile
- Update viewport to include viewport-fit=cover for Samsung safe areas

apps/web/app/(dashboard)/alertas/discrepancia-regimen/page.tsx

@@ -240,7 +240,7 @@ export default function DiscrepanciaRegimenPage() {
                 type="date"
                 value={fechaDesde}
                 onChange={e => setFechaDesde(e.target.value)}
-                className="h-8 w-[150px] text-sm"
+                className="h-8 w-full sm:w-[150px] text-sm"
               />
             </div>
             <div className="flex items-center gap-2">
@@ -249,7 +249,7 @@ export default function DiscrepanciaRegimenPage() {
                 type="date"
                 value={fechaHasta}
                 onChange={e => setFechaHasta(e.target.value)}
-                className="h-8 w-[150px] text-sm"
+                className="h-8 w-full sm:w-[150px] text-sm"
               />
             </div>
             <div className="flex items-center gap-2">