fix: harden update pipeline and restore a clean production build

- update-Nitrov3.sh: build CMS into .next-staging and swap atomically so a
  failed build never takes the live site down; auto-merge new variables
  from .env.example; validate env for duplicates/broken lines; restart the
  emulator/CMS only when rebuilt or unhealthy; fix step renumbering
- next.config.ts: support NEXT_DIST_DIR for staged production builds
- fix all TS errors (unused imports, missing tryDownloadCandidates helper)
  so tsc and the production build pass clean
- add Dockerfile/.dockerignore and switch docker-compose to a CMS container
- include prevailing UI/refactor changes (SurfaceCard, ticketing, tsconfig)

src/components/ui/select.tsx

@@ -23,16 +23,6 @@ function Select({ onValueChange, ...props }: SelectProps) {
 	);
 }
 
-function SelectGroup({ className, ...props }: SelectPrimitive.Group.Props) {
-	return (
-		<SelectPrimitive.Group
-			data-slot="select-group"
-			className={cn(className)}
-			{...props}
-		/>
-	);
-}
-
 function SelectValue({ className, ...props }: SelectPrimitive.Value.Props) {
 	return (
 		<SelectPrimitive.Value
@@ -116,19 +106,6 @@ function SelectContent({
 	);
 }
 
-function SelectLabel({
-	className,
-	...props
-}: SelectPrimitive.GroupLabel.Props) {
-	return (
-		<SelectPrimitive.GroupLabel
-			data-slot="select-label"
-			className={cn("text-muted-foreground px-2 py-1.5 text-xs", className)}
-			{...props}
-		/>
-	);
-}
-
 function SelectItem({
 	className,
 	children,
@@ -156,19 +133,6 @@ function SelectItem({
 	);
 }
 
-function SelectSeparator({
-	className,
-	...props
-}: SelectPrimitive.Separator.Props) {
-	return (
-		<SelectPrimitive.Separator
-			data-slot="select-separator"
-			className={cn("bg-border pointer-events-none -mx-1 my-1 h-px", className)}
-			{...props}
-		/>
-	);
-}
-
 function SelectScrollUpButton({
 	className,
 	...props
@@ -208,12 +172,9 @@ function SelectScrollDownButton({
 export {
 	Select,
 	SelectContent,
-	SelectGroup,
 	SelectItem,
-	SelectLabel,
 	SelectScrollDownButton,
 	SelectScrollUpButton,
-	SelectSeparator,
 	SelectTrigger,
 	SelectValue,
 };