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/index.ts

@@ -8,7 +8,8 @@ export { Dialog, DialogClose, DialogContent, DialogDescription, DialogFooter, Di
 export { Input, InputGroup, InputIcon } from './input'
 export { Label } from './label'
 export { KPICard } from './kpi_card'
-export { Select, SelectContent, SelectGroup, SelectGroupLabel, SelectItem, SelectPortal, SelectSeparator, SelectTrigger, SelectValue } from './select'
+export { Select } from './select'
+export type { SelectProps } from './select'
 export { SimpleSelect } from './simple_select'
 export type { SimpleSelectOption, SimpleSelectGroup, SimpleSelectOptions } from './simple_select'
 export { Skeleton, SkeletonAvatar, SkeletonButton, SkeletonCard, SkeletonTable, SkeletonText } from './skeleton'
@@ -37,11 +38,9 @@ export type { Series } from './chart_container'
 export { DataTable } from './data_table'
 export type { DataTableProps, ColumnDef } from './data_table'
 
-// Theme
-export { ThemeProvider, useTheme, ThemeContext } from './theme_provider'
-export type { ThemeProviderProps } from './theme_provider'
-export { applyTheme } from './apply_theme'
-export type { Theme, ThemeColors } from './apply_theme'
+// Mantine Provider
+export { FnMantineProvider } from './mantine_provider'
+export type { FnMantineProviderProps } from './mantine_provider'
 
 // Page templates
 export { analyticsPage } from './analytics_page'
@@ -82,14 +81,14 @@ export type { CheckboxProps } from './checkbox'
 
 // Command
 export { Command, CommandEmpty, CommandGroup, CommandInput, CommandItem, CommandList, CommandSearch, CommandSeparator, CommandShortcut } from './command'
-export type { CommandProps } from './command'
+export type { CommandItemData, CommandProps } from './command'
 
 // Dropdown Menu
 export { DropdownMenu, DropdownMenuCheckboxItem, DropdownMenuContent, DropdownMenuGroup, DropdownMenuItem, DropdownMenuLabel, DropdownMenuPortal, DropdownMenuRadioGroup, DropdownMenuRadioItem, DropdownMenuSeparator, DropdownMenuShortcut, DropdownMenuSub, DropdownMenuSubContent, DropdownMenuSubTrigger, DropdownMenuTrigger } from './dropdown_menu'
 
 // Pagination
-export { Pagination, PaginationContent, PaginationEllipsis, PaginationItem, PaginationLink, PaginationNext, PaginationPrevious } from './pagination'
-export type { PaginationLinkProps } from './pagination'
+export { Pagination } from './pagination'
+export type { PaginationProps } from './pagination'
 
 // Popover
 export { Popover, PopoverClose, PopoverContent, PopoverDescription, PopoverHeader, PopoverPortal, PopoverTitle, PopoverTrigger } from './popover'
@@ -123,3 +122,15 @@ export { useAnimatedCanvas } from './use_animated_canvas'
 
 // Wails Provider
 export { WailsProvider } from './wails_provider'
+
+// New Mantine components
+export { FnAppShell } from './app_shell'
+export { FnStepper } from './stepper'
+export { FnTimeline } from './timeline'
+export { FnActionIcon } from './action_icon'
+export { FnNumberInput } from './number_input'
+export { FnSegmentedControl } from './segmented_control'
+export { FnLoadingOverlay } from './loading_overlay'
+export { FnRingProgress } from './ring_progress'
+export { FnNavLink } from './nav_link'
+export { FnIndicator } from './indicator'