feat: build production-ready wtr weather PWA

components/ui/button.tsx

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+import { forwardRef, type ButtonHTMLAttributes } from "react";
+import { cva, type VariantProps } from "class-variance-authority";
+import { cn } from "@/lib/utils";
+
+const buttonVariants = cva(
+  "inline-flex items-center justify-center gap-2 rounded-full text-sm font-medium transition duration-200 focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-sky-500 disabled:pointer-events-none disabled:opacity-50",
+  {
+    variants: {
+      variant: {
+        default: "bg-slate-950 px-4 py-2.5 text-white hover:bg-slate-800 dark:bg-white dark:text-slate-950 dark:hover:bg-slate-200",
+        glass: "border border-white/30 bg-white/30 px-4 py-2.5 text-slate-800 backdrop-blur-xl hover:bg-white/50 dark:border-white/10 dark:bg-white/10 dark:text-white dark:hover:bg-white/20",
+        ghost: "px-3 py-2 text-slate-700 hover:bg-white/50 dark:text-slate-200 dark:hover:bg-white/10",
+        icon: "size-10 border border-white/30 bg-white/30 text-slate-800 backdrop-blur-xl hover:bg-white/50 dark:border-white/10 dark:bg-white/10 dark:text-white dark:hover:bg-white/20",
+      },
+    },
+    defaultVariants: { variant: "default" },
+  },
+);
+
+export interface ButtonProps extends ButtonHTMLAttributes<HTMLButtonElement>, VariantProps<typeof buttonVariants> {}
+
+export const Button = forwardRef<HTMLButtonElement, ButtonProps>(({ className, variant, ...props }, ref) => (
+  <button ref={ref} className={cn(buttonVariants({ variant }), className)} {...props} />
+));
+Button.displayName = "Button";

components/ui/card.tsx

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+import type { HTMLAttributes } from "react";
+import { cn } from "@/lib/utils";
+
+export function Card({ className, ...props }: HTMLAttributes<HTMLDivElement>) {
+  return <div className={cn("glass rounded-[1.75rem]", className)} {...props} />;
+}

components/ui/install-pwa-button.tsx

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+"use client";
+
+import { useEffect, useState } from "react";
+import { Download } from "lucide-react";
+import { Button } from "@/components/ui/button";
+
+interface BeforeInstallPromptEvent extends Event {
+  prompt: () => Promise<void>;
+  userChoice: Promise<{ outcome: "accepted" | "dismissed" }>;
+}
+
+export function InstallPWAButton() {
+  const [event, setEvent] = useState<BeforeInstallPromptEvent | null>(null);
+  useEffect(() => {
+    const handlePrompt = (promptEvent: Event) => {
+      promptEvent.preventDefault();
+      setEvent(promptEvent as BeforeInstallPromptEvent);
+    };
+    window.addEventListener("beforeinstallprompt", handlePrompt);
+    return () => window.removeEventListener("beforeinstallprompt", handlePrompt);
+  }, []);
+
+  if (!event) return null;
+  return (
+    <Button
+      variant="glass"
+      onClick={async () => {
+        await event.prompt();
+        await event.userChoice;
+        setEvent(null);
+      }}
+    >
+      <Download className="size-4" />
+      Zainstaluj
+    </Button>
+  );
+}

components/ui/theme-toggle.tsx

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+"use client";
+
+import { useEffect, useState } from "react";
+import { Moon, Sun, SunMoon } from "lucide-react";
+import { Button } from "@/components/ui/button";
+
+export function ThemeToggle() {
+  const [mounted, setMounted] = useState(false);
+  const [isDark, setIsDark] = useState(false);
+
+  useEffect(() => {
+    const root = document.documentElement;
+    const media = window.matchMedia("(prefers-color-scheme: dark)");
+    const syncSystemTheme = () => {
+      if (!window.localStorage.getItem("wtr:theme")) {
+        root.classList.toggle("dark", media.matches);
+        setIsDark(media.matches);
+      }
+    };
+    const animationFrame = window.requestAnimationFrame(() => {
+      setIsDark(root.classList.contains("dark"));
+      setMounted(true);
+    });
+    media.addEventListener("change", syncSystemTheme);
+    return () => {
+      window.cancelAnimationFrame(animationFrame);
+      media.removeEventListener("change", syncSystemTheme);
+    };
+  }, []);
+
+  const toggleTheme = () => {
+    const nextIsDark = !isDark;
+    document.documentElement.classList.toggle("dark", nextIsDark);
+    window.localStorage.setItem("wtr:theme", nextIsDark ? "dark" : "light");
+    setIsDark(nextIsDark);
+  };
+
+  return (
+    <Button
+      variant="icon"
+      type="button"
+      aria-label={!mounted ? "Zmień motyw" : isDark ? "Włącz jasny motyw" : "Włącz ciemny motyw"}
+      onClick={toggleTheme}
+    >
+      {!mounted ? <SunMoon className="size-4" /> : isDark ? <Sun className="size-4" /> : <Moon className="size-4" />}
+    </Button>
+  );
+}