refactor: migrar Select y SimpleSelect a native HTML select

Select reescrito de @base-ui/react primitives a <select> nativo con wrapper
para mantener la misma API visual (ChevronDown, estilos tema). SimpleSelect
actualizado para usar <select>/<optgroup> directamente sin intermediarios.
Checkbox corregido: import CheckboxIndicator separado reemplazado por
CheckboxPrimitive.Indicator para consistencia.

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

frontend/functions/ui/select.tsx

@@ -1,88 +1,91 @@
 "use client"
 
 import * as React from "react"
-import { Select as SelectPrimitive } from "@base-ui/react/select"
-import { ChevronDown, Check } from "lucide-react"
 import { cn } from "../core/cn"
+import { ChevronDown } from "lucide-react"
 
-function Select<T>({ ...props }: SelectPrimitive.Root.Props<T>) {
-  return <SelectPrimitive.Root data-slot="select" {...props} />
+// ── Native select wrapper ─────────────────────────────────────────────────
+
+interface SelectProps extends React.ComponentPropsWithoutRef<"select"> {
+  placeholder?: string
 }
 
-function SelectValue({ ...props }: SelectPrimitive.Value.Props) {
-  return <SelectPrimitive.Value data-slot="select-value" {...props} />
+const Select = React.forwardRef<HTMLSelectElement, SelectProps>(
+  ({ className, children, placeholder, ...props }, ref) => {
+    return (
+      <div className="relative">
+        <select
+          ref={ref}
+          data-slot="select"
+          className={cn(
+            "flex h-8 w-full appearance-none items-center rounded-lg border border-input bg-transparent px-2.5 pr-8 py-1 text-sm transition-colors outline-none",
+            "focus-visible:border-ring focus-visible:ring-3 focus-visible:ring-ring/50",
+            "disabled:pointer-events-none disabled:cursor-not-allowed disabled:opacity-50",
+            "aria-invalid:border-destructive aria-invalid:ring-destructive/20",
+            className,
+          )}
+          {...props}
+        >
+          {placeholder && (
+            <option value="" disabled>
+              {placeholder}
+            </option>
+          )}
+          {children}
+        </select>
+        <ChevronDown className="pointer-events-none absolute right-2 top-1/2 size-4 -translate-y-1/2 text-muted-foreground" />
+      </div>
+    )
+  },
+)
+Select.displayName = "Select"
+
+// ── Sub-components (thin wrappers for API compatibility) ──────────────────
+
+function SelectItem({
+  className,
+  ...props
+}: React.ComponentPropsWithoutRef<"option">) {
+  return <option className={className} {...props} />
 }
 
-function SelectTrigger({ className, children, ...props }: SelectPrimitive.Trigger.Props) {
-  return (
-    <SelectPrimitive.Trigger
-      data-slot="select-trigger"
-      className={cn(
-        "flex h-8 w-full items-center justify-between gap-2 rounded-lg border border-input bg-transparent px-2.5 py-1 text-sm transition-colors outline-none placeholder:text-muted-foreground focus-visible:border-ring focus-visible:ring-3 focus-visible:ring-ring/50 disabled:pointer-events-none disabled:cursor-not-allowed disabled:opacity-50 aria-invalid:border-destructive aria-invalid:ring-destructive/20 dark:bg-input/30 [&>span]:line-clamp-1",
-        className
-      )}
-      {...props}
-    >
-      {children}
-      <SelectPrimitive.Icon>
-        <ChevronDown className="size-4 shrink-0 text-muted-foreground" />
-      </SelectPrimitive.Icon>
-    </SelectPrimitive.Trigger>
-  )
+function SelectGroup({
+  className,
+  ...props
+}: React.ComponentPropsWithoutRef<"optgroup">) {
+  return <optgroup className={className} {...props} />
 }
 
-function SelectPortal({ ...props }: SelectPrimitive.Portal.Props) {
-  return <SelectPrimitive.Portal data-slot="select-portal" {...props} />
+function SelectGroupLabel(_props: { children?: React.ReactNode }) {
+  // optgroup uses `label` attr, this is a no-op for compatibility
+  return null
 }
 
-function SelectContent({ className, children, ...props }: SelectPrimitive.Positioner.Props) {
-  return (
-    <SelectPortal>
-      <SelectPrimitive.Positioner
-        data-slot="select-content"
-        className={cn(
-          "relative z-50 max-h-[300px] min-w-[8rem] overflow-hidden rounded-lg border bg-popover text-popover-foreground shadow-md",
-          "data-open:animate-in data-open:fade-in-0 data-open:zoom-in-95",
-          "data-closed:animate-out data-closed:fade-out-0 data-closed:zoom-out-95",
-          className
-        )}
-        sideOffset={4}
-        {...props}
-      >
-        <SelectPrimitive.Popup className="w-full p-1">{children}</SelectPrimitive.Popup>
-      </SelectPrimitive.Positioner>
-    </SelectPortal>
-  )
+// Stubs for barrel export compatibility — these are no-ops with native select
+function SelectContent({ children }: { children?: React.ReactNode; className?: string }) {
+  return <>{children}</>
 }
-
-function SelectGroup({ ...props }: SelectPrimitive.Group.Props) {
-  return <SelectPrimitive.Group data-slot="select-group" {...props} />
+function SelectTrigger({ children }: { children?: React.ReactNode; className?: string }) {
+  return <>{children}</>
 }
-
-function SelectGroupLabel({ className, ...props }: SelectPrimitive.GroupLabel.Props) {
-  return <SelectPrimitive.GroupLabel data-slot="select-group-label" className={cn("px-2 py-1.5 text-xs font-medium text-muted-foreground", className)} {...props} />
+function SelectValue(_props: { placeholder?: string }) {
+  return null
 }
-
-function SelectItem({ className, children, ...props }: SelectPrimitive.Item.Props) {
-  return (
-    <SelectPrimitive.Item
-      data-slot="select-item"
-      className={cn(
-        "relative flex w-full cursor-default select-none items-center rounded-md py-1.5 pl-8 pr-2 text-sm outline-none focus:bg-accent focus:text-accent-foreground data-disabled:pointer-events-none data-disabled:opacity-50",
-        className
-      )}
-      {...props}
-    >
-      <span className="absolute left-2 flex size-4 items-center justify-center">
-        <SelectPrimitive.ItemIndicator><Check className="size-4" /></SelectPrimitive.ItemIndicator>
-      </span>
-      <SelectPrimitive.ItemText>{children}</SelectPrimitive.ItemText>
-    </SelectPrimitive.Item>
-  )
+function SelectPortal({ children }: { children?: React.ReactNode }) {
+  return <>{children}</>
 }
-
 function SelectSeparator({ className, ...props }: React.ComponentProps<"div">) {
-  return <div data-slot="select-separator" className={cn("-mx-1 my-1 h-px bg-muted", className)} {...props} />
+  return <div className={cn("-mx-1 my-1 h-px bg-muted", className)} {...props} />
 }
 
-export { Select, SelectContent, SelectGroup, SelectGroupLabel, SelectItem, SelectPortal, SelectSeparator, SelectTrigger, SelectValue }
+export {
+  Select,
+  SelectContent,
+  SelectGroup,
+  SelectGroupLabel,
+  SelectItem,
+  SelectPortal,
+  SelectSeparator,
+  SelectTrigger,
+  SelectValue,
+}