refactor(settings): remove wrapper layers, dead props and unused dictionary keys

- components/model-selector.tsx uses Dialog, Command and Tooltip
  directly; delete components/ai-elements/model-selector.tsx and
  components/button-with-tooltip.tsx; one renderGroups for both lists;
  no "Server · " prefix round trip
- components/ui: drop CommandDialog, CommandShortcut and six unused
  shadcn exports
- model-config-dialog: no type-to-confirm on provider delete;
  provider-credentials-fields: drop footer and bedrockApiKey
- hooks/use-model-config.ts and lib/types/model-config.ts: remove the
  2025-12 single-provider migration, resetConfig, selectedModel and
  fields nothing reads
- components/chat/TemplateFormDialog.tsx replaces the create and edit
  dialogs; TemplatePanel drops the setInput fallback, the
  templatesChanged listener, dictionary fallbacks and formatLastUsed;
  lib/template-storage.ts drops getTemplate, clickCount and indexes
- reasoning.tsx becomes one component; shimmer uses a CSS keyframe
  (motion and @radix-ui/react-use-controllable-state removed)
- error-toast.tsx deleted in favour of toast.error; ValidationCard
  drops the idle status; dev-xml-simulator uses English literals
- admin: no enum setting type, shared types from lib/admin
  (AdminProviderInput stays exported for that), ENABLE_HISTORY_XML_REPLACE
  entry removed
- app/globals.css: drop check-pop, --ease-spring, --duration-normal
  and the shadow aliases
- dictionaries: 81 unused keys removed from all four languages

components/ui/command.tsx

@@ -5,13 +5,6 @@ import { Command as CommandPrimitive } from "cmdk"
 import { SearchIcon } from "lucide-react"
 
 import { cn } from "@/lib/utils"
-import {
-  Dialog,
-  DialogContent,
-  DialogDescription,
-  DialogHeader,
-  DialogTitle,
-} from "@/components/ui/dialog"
 
 function Command({
   className,
@@ -29,32 +22,6 @@ function Command({
   )
 }
 
-function CommandDialog({
-  title = "Command Palette",
-  description = "Search for a command to run...",
-  children,
-  className,
-  ...props
-}: React.ComponentProps<typeof Dialog> & {
-  title?: string
-  description?: string
-  className?: string
-}) {
-  return (
-    <Dialog {...props}>
-      <DialogHeader className="sr-only">
-        <DialogTitle>{title}</DialogTitle>
-        <DialogDescription>{description}</DialogDescription>
-      </DialogHeader>
-      <DialogContent className={cn("overflow-hidden p-0", className)}>
-        <Command className="[&_[cmdk-group-heading]]:text-muted-foreground **:data-[slot=command-input-wrapper]:h-12 [&_[cmdk-group-heading]]:px-2 [&_[cmdk-group-heading]]:font-medium [&_[cmdk-group]]:px-2 [&_[cmdk-group]:not([hidden])_~[cmdk-group]]:pt-0 [&_[cmdk-input-wrapper]_svg]:h-5 [&_[cmdk-input-wrapper]_svg]:w-5 [&_[cmdk-input]]:h-12 [&_[cmdk-item]]:px-2 [&_[cmdk-item]]:py-3 [&_[cmdk-item]_svg]:h-5 [&_[cmdk-item]_svg]:w-5">
-          {children}
-        </Command>
-      </DialogContent>
-    </Dialog>
-  )
-}
-
 function CommandInput({
   className,
   ...props
@@ -164,30 +131,12 @@ function CommandItem({
   )
 }
 
-function CommandShortcut({
-  className,
-  ...props
-}: React.ComponentProps<"span">) {
-  return (
-    <span
-      data-slot="command-shortcut"
-      className={cn(
-        "text-muted-foreground ml-auto text-xs tracking-widest",
-        className
-      )}
-      {...props}
-    />
-  )
-}
-
 export {
   Command,
-  CommandDialog,
   CommandInput,
   CommandList,
   CommandEmpty,
   CommandGroup,
   CommandItem,
-  CommandShortcut,
   CommandSeparator,
 }