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/context-menu.tsx

@@ -1,7 +1,6 @@
 "use client";
 
 import { ContextMenu as ContextMenuPrimitive } from "@base-ui/react/context-menu";
-import type * as React from "react";
 
 import { resolveAsChild } from "@/lib/as-child";
 import { cn } from "@/lib/utils";
@@ -120,28 +119,11 @@ function ContextMenuLabel({
 	);
 }
 
-function ContextMenuShortcut({
-	className,
-	...props
-}: React.ComponentProps<"span">) {
-	return (
-		<span
-			data-slot="context-menu-shortcut"
-			className={cn(
-				"text-muted-foreground ml-auto text-xs tracking-widest",
-				className,
-			)}
-			{...props}
-		/>
-	);
-}
-
 export {
 	ContextMenu,
 	ContextMenuContent,
 	ContextMenuItem,
 	ContextMenuLabel,
 	ContextMenuSeparator,
-	ContextMenuShortcut,
 	ContextMenuTrigger,
 };