feat: nuevos componentes UI — accordion, avatar, breadcrumb, checkbox, command, dropdown, pagination, popover, radio, sheet, select, switch, textarea, toast

Componentes React accesibles basados en Radix UI con soporte de temas via CSS variables. Incluye barrel export en index.ts.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

frontend/functions/ui/sheet.md

@@ -0,0 +1,71 @@
+---
+name: sheet
+kind: component
+lang: ts
+domain: ui
+version: "1.0.0"
+purity: impure
+signature: "Sheet(props: SheetProps): JSX.Element"
+description: "Panel lateral deslizante (drawer) accesible con variantes de lado y animaciones. Base-UI Dialog con posicionamiento lateral via CVA."
+tags: [sheet, drawer, panel, component, ui, interactive, overlay, base-ui, cva]
+uses_functions: [cn_ts_core]
+uses_types: []
+returns: []
+returns_optional: false
+error_type: ""
+imports: ["@base-ui/react/dialog", "class-variance-authority", "lucide-react"]
+tested: false
+tests: []
+test_file_path: ""
+file_path: "frontend/functions/ui/sheet.tsx"
+props:
+  - name: side
+    type: "'top' | 'bottom' | 'left' | 'right'"
+    required: false
+    description: "Lado desde el que aparece el panel (default: right)"
+  - name: showCloseButton
+    type: "boolean"
+    required: false
+    description: "Muestra el boton de cierre (default: true)"
+  - name: open
+    type: "boolean"
+    required: false
+    description: "Estado controlado de apertura"
+  - name: onOpenChange
+    type: "(open: boolean) => void"
+    required: false
+    description: "Callback cuando cambia el estado"
+emits: [onOpenChange]
+has_state: false
+framework: react
+variant: [top, bottom, left, right]
+---
+
+## Ejemplo
+
+```tsx
+<Sheet>
+  <SheetTrigger asChild>
+    <Button variant="outline">Abrir panel</Button>
+  </SheetTrigger>
+  <SheetContent side="right">
+    <SheetHeader>
+      <SheetTitle>Editar perfil</SheetTitle>
+      <SheetDescription>Realiza cambios en tu perfil.</SheetDescription>
+    </SheetHeader>
+    <div className="py-4">
+      {/* contenido del panel */}
+    </div>
+    <SheetFooter>
+      <SheetClose asChild>
+        <Button variant="outline">Cancelar</Button>
+      </SheetClose>
+      <Button>Guardar</Button>
+    </SheetFooter>
+  </SheetContent>
+</Sheet>
+```
+
+## Notas
+
+Reutiliza Base-UI Dialog para el comportamiento modal. Las animaciones de deslizamiento usan slide-in-from-* de Tailwind. CVA gestiona las variantes de lado. Exports: Sheet, SheetTrigger, SheetContent, SheetClose, SheetPortal, SheetOverlay, SheetHeader, SheetFooter, SheetTitle, SheetDescription.