feat(frontend): add shared client libraries and UI primitives

Introduce API helpers, types, hooks, design-system components, and the authenticated app shell.

frontend/src/components/ui/input.tsx

@@ -0,0 +1,48 @@
+import * as React from "react";
+import { cn } from "@/lib/utils";
+
+const LATIN_INPUT_TYPES = new Set(["password", "email", "url", "tel"]);
+
+function wantsLatinDigits(props: React.InputHTMLAttributes<HTMLInputElement>): boolean {
+  const type = props.type ?? "text";
+  if (LATIN_INPUT_TYPES.has(type)) return true;
+  if (props.dir === "ltr") return true;
+  const ac = (props.autoComplete ?? "").toLowerCase();
+  if (
+    ac === "username" ||
+    ac === "email" ||
+    ac.includes("password") ||
+    ac === "one-time-code" ||
+    ac === "tel" ||
+    ac === "url"
+  ) {
+    return true;
+  }
+  const id = `${props.id ?? ""} ${props.name ?? ""}`.toLowerCase();
+  if (id.includes("captcha") || id.includes("password") || id.includes("username") || id.includes("email")) {
+    return true;
+  }
+  return false;
+}
+
+const Input = React.forwardRef<HTMLInputElement, React.InputHTMLAttributes<HTMLInputElement>>(
+  ({ className, type, ...props }, ref) => {
+    const latin = wantsLatinDigits({ type, ...props });
+    return (
+      <input
+        type={type}
+        className={cn(
+          // Fixed height + symmetric vertical padding; avoid clipping Vazirmatn descenders.
+          "box-border h-11 w-full rounded-lg border border-input bg-card px-3.5 py-0 font-sans text-sm font-medium leading-none outline-none transition-colors placeholder:font-sans placeholder:font-medium placeholder:text-muted-foreground focus-visible:ring-2 focus-visible:ring-ring disabled:cursor-not-allowed disabled:opacity-50",
+          latin && "font-latin placeholder:font-latin",
+          className
+        )}
+        ref={ref}
+        {...props}
+      />
+    );
+  }
+);
+Input.displayName = "Input";
+
+export { Input };