initial: mirror of @fn_library from fn_registry

75 components + DESIGN_SYSTEM.md + sync script.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

components/textarea.md

@@ -0,0 +1,67 @@
+---
+name: textarea
+kind: component
+lang: ts
+domain: ui
+version: "1.0.0"
+purity: impure
+signature: "Textarea(props: TextareaProps): JSX.Element"
+description: "Input multilinea accesible con auto-resize opcional. Mantine Textarea con autosize."
+tags: [textarea, component, ui, interactive, form, mantine]
+uses_functions: []
+uses_types: []
+returns: []
+returns_optional: false
+error_type: ""
+imports: ["@mantine/core"]
+output: "Componente Textarea que renderiza input multilinea accesible con auto-resize opcional"
+tested: false
+tests: []
+test_file_path: ""
+file_path: "frontend/functions/ui/textarea.tsx"
+props:
+  - name: autoResize
+    type: "boolean"
+    required: false
+    description: "Ajusta la altura automaticamente al contenido (default: false)"
+  - name: placeholder
+    type: "string"
+    required: false
+    description: "Texto placeholder"
+  - name: disabled
+    type: "boolean"
+    required: false
+    description: "Deshabilita el textarea"
+  - name: rows
+    type: "number"
+    required: false
+    description: "Numero de filas visibles iniciales"
+  - name: className
+    type: "string"
+    required: false
+    description: "Clases CSS adicionales"
+emits: [onChange, onFocus, onBlur]
+has_state: false
+framework: react
+variant: []
+---
+
+## Ejemplo
+
+```tsx
+// Basico
+<Textarea placeholder="Escribe aqui..." rows={4} />
+
+// Con auto-resize
+<Textarea autoResize placeholder="Crece automaticamente..." />
+
+// Controlado
+<Textarea value={text} onChange={(e) => setText(e.target.value)} />
+
+// Con validacion
+<Textarea aria-invalid={!!error} />
+```
+
+## Notas
+
+Usa Mantine Textarea con autosize nativo (reemplaza el auto-resize manual anterior). forwardRef mantenido para compatibilidad con form libraries.