refactor: migrate frontend from shadcn/Tailwind to Mantine v9

Reescribe todos los componentes UI para usar Mantine v9 en lugar de shadcn/Tailwind.
Elimina cn(), CVA, components.json, theme_provider custom y globals.css con Tailwind.
Añade 25+ componentes nuevos (AppShell, AuthForm, DatePickerInput, Dropzone, etc.)
y MantineProvider como wrapper estándar del sistema de temas.

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

frontend/functions/ui/pagination.tsx

@@ -1,100 +1,43 @@
-import * as React from "react"
-import { ChevronLeftIcon, ChevronRightIcon, MoreHorizontalIcon } from "lucide-react"
-import { cn } from "../core/cn"
-import { buttonVariants } from "./button"
+import { Pagination as MantinePagination } from "@mantine/core"
 
-function Pagination({ className, ...props }: React.ComponentProps<"nav">) {
+interface PaginationProps {
+  total: number
+  value?: number
+  defaultValue?: number
+  onChange?: (page: number) => void
+  siblings?: number
+  boundaries?: number
+  withEdges?: boolean
+  className?: string
+}
+
+function Pagination({
+  total,
+  value,
+  defaultValue,
+  onChange,
+  siblings,
+  boundaries,
+  withEdges = false,
+  className,
+  ...props
+}: PaginationProps) {
   return (
-    <nav
+    <MantinePagination
       data-slot="pagination"
-      role="navigation"
-      aria-label="pagination"
-      className={cn("mx-auto flex w-full justify-center", className)}
+      total={total}
+      value={value}
+      defaultValue={defaultValue}
+      onChange={onChange}
+      siblings={siblings}
+      boundaries={boundaries}
+      withEdges={withEdges}
+      className={className}
+      size="sm"
       {...props}
     />
   )
 }
 
-function PaginationContent({ className, ...props }: React.ComponentProps<"ul">) {
-  return (
-    <ul
-      data-slot="pagination-content"
-      className={cn("flex flex-row items-center gap-1", className)}
-      {...props}
-    />
-  )
-}
-
-function PaginationItem({ ...props }: React.ComponentProps<"li">) {
-  return <li data-slot="pagination-item" {...props} />
-}
-
-type PaginationLinkProps = {
-  isActive?: boolean
-  disabled?: boolean
-  size?: "icon" | "default" | "sm" | "lg"
-} & React.ComponentProps<"a">
-
-function PaginationLink({ className, isActive, disabled, size = "icon", ...props }: PaginationLinkProps) {
-  return (
-    <a
-      data-slot="pagination-link"
-      aria-current={isActive ? "page" : undefined}
-      aria-disabled={disabled}
-      className={cn(
-        buttonVariants({ variant: isActive ? "outline" : "ghost", size }),
-        disabled && "pointer-events-none opacity-50",
-        isActive && "border-border font-medium",
-        className
-      )}
-      {...props}
-    />
-  )
-}
-
-function PaginationPrevious({ className, ...props }: React.ComponentProps<"a">) {
-  return (
-    <PaginationLink
-      data-slot="pagination-previous"
-      aria-label="Go to previous page"
-      size="default"
-      className={cn("gap-1 px-2.5 pl-2", className)}
-      {...props}
-    >
-      <ChevronLeftIcon className="size-4" />
-      <span>Previous</span>
-    </PaginationLink>
-  )
-}
-
-function PaginationNext({ className, ...props }: React.ComponentProps<"a">) {
-  return (
-    <PaginationLink
-      data-slot="pagination-next"
-      aria-label="Go to next page"
-      size="default"
-      className={cn("gap-1 px-2.5 pr-2", className)}
-      {...props}
-    >
-      <span>Next</span>
-      <ChevronRightIcon className="size-4" />
-    </PaginationLink>
-  )
-}
-
-function PaginationEllipsis({ className, ...props }: React.ComponentProps<"span">) {
-  return (
-    <span
-      data-slot="pagination-ellipsis"
-      aria-hidden
-      className={cn("flex size-8 items-center justify-center text-muted-foreground", className)}
-      {...props}
-    >
-      <MoreHorizontalIcon className="size-4" />
-      <span className="sr-only">More pages</span>
-    </span>
-  )
-}
-
-export { Pagination, PaginationContent, PaginationEllipsis, PaginationItem, PaginationLink, PaginationNext, PaginationPrevious }
-export type { PaginationLinkProps }
+export { Pagination }
+export type { PaginationProps }