Implement the 010-ui-baseline feature that establishes a modern UI using Tailwind CSS v4 and shadcn/ui-style components for the encounter screen

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

apps/web/src/lib/utils.ts

@@ -0,0 +1,6 @@
+import { type ClassValue, clsx } from "clsx";
+import { twMerge } from "tailwind-merge";
+
+export function cn(...inputs: ClassValue[]) {
+	return twMerge(clsx(inputs));
+}