Add web frontend

web/src/components/ui/button.tsx

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+import { cva, type VariantProps } from "class-variance-authority";
+import type { JSX } from "preact";
+import { cn } from "@/lib/utils";
+
+const buttonVariants = cva(
+  "inline-flex items-center justify-center whitespace-nowrap rounded-md text-sm font-medium transition-colors disabled:pointer-events-none disabled:opacity-50 focus-visible:outline-none focus-visible:ring-1 focus-visible:ring-ring",
+  {
+    variants: {
+      variant: {
+        default: "bg-primary text-primary-foreground shadow hover:bg-primary/90",
+        secondary: "bg-secondary text-secondary-foreground hover:bg-secondary/80",
+        outline: "border border-input bg-background hover:bg-accent hover:text-accent-foreground",
+        ghost: "hover:bg-accent hover:text-accent-foreground",
+      },
+      size: {
+        default: "h-10 px-4 py-2",
+        sm: "h-8 rounded-md px-3 text-xs",
+        lg: "h-11 rounded-md px-8",
+        icon: "h-9 w-9",
+      },
+    },
+    defaultVariants: {
+      variant: "default",
+      size: "default",
+    },
+  }
+);
+
+type ButtonProps = JSX.ButtonHTMLAttributes<HTMLButtonElement> & VariantProps<typeof buttonVariants>;
+
+export function Button({ className, variant, size, ...props }: ButtonProps) {
+  return <button className={cn(buttonVariants({ variant, size }), className)} {...props} />;
+}

web/src/components/ui/input.tsx

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+import type { JSX } from "preact";
+import { cn } from "@/lib/utils";
+
+export function Input({ className, ...props }: JSX.InputHTMLAttributes<HTMLInputElement>) {
+  return (
+    <input
+      className={cn(
+        "flex h-9 w-full rounded-md border border-input bg-background px-3 py-1 text-sm shadow-sm transition-colors placeholder:text-muted-foreground focus-visible:outline-none focus-visible:ring-1 focus-visible:ring-ring",
+        className
+      )}
+      {...props}
+    />
+  );
+}

web/src/components/ui/scroll-area.tsx

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+import type { ComponentChildren } from "preact";
+import { cn } from "@/lib/utils";
+
+type ScrollAreaProps = {
+  className?: string;
+  children: ComponentChildren;
+};
+
+export function ScrollArea({ className, children }: ScrollAreaProps) {
+  return <div className={cn("overflow-y-auto", className)}>{children}</div>;
+}

web/src/components/ui/separator.tsx

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+import { cn } from "@/lib/utils";
+
+type SeparatorProps = {
+  className?: string;
+};
+
+export function Separator({ className }: SeparatorProps) {
+  return <div className={cn("h-px w-full bg-border", className)} />;
+}

web/src/components/ui/textarea.tsx

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+import type { JSX } from "preact";
+import { cn } from "@/lib/utils";
+
+export function Textarea({ className, ...props }: JSX.TextareaHTMLAttributes<HTMLTextAreaElement>) {
+  return (
+    <textarea
+      className={cn(
+        "flex min-h-[80px] w-full rounded-md border border-input bg-background px-3 py-2 text-sm shadow-sm transition-colors placeholder:text-muted-foreground focus-visible:outline-none focus-visible:ring-1 focus-visible:ring-ring",
+        className
+      )}
+      {...props}
+    />
+  );
+}