feat: add PWA install button to header

src/components/UI/PwaInstallButton.jsx

@@ -0,0 +1,76 @@
+import React from "react";
+
+/**
+ * Compact PWA install button for the header.
+ * - Shows 📲 icon when install prompt is available (Chrome/Edge on Android & desktop).
+ * - Shows iOS Safari instructions tooltip on click when on iOS.
+ * - Hidden when app is already installed (standalone mode).
+ * - After install: auto-hidden via appinstalled event.
+ */
+export const PwaInstallButton = ({ onInstall, isInstalled, isInstallAvailable }) => {
+  const [showTip, setShowTip] = React.useState(false);
+  const tipRef = React.useRef(null);
+
+  // Detect iOS (no beforeinstallprompt, but can be added to home screen)
+  const isIOS = typeof navigator !== "undefined" && /iPad|iPhone|iPod/.test(navigator.userAgent) && !window.MSStream;
+
+  const handleInstallClick = async () => {
+    if (isInstallAvailable && onInstall) {
+      await onInstall();
+    } else {
+      // Show instruction tip for iOS or unsupported browsers
+      setShowTip((prev) => !prev);
+    }
+  };
+
+  // Close tip on outside click
+  React.useEffect(() => {
+    if (!showTip) return;
+    const handler = (e) => {
+      if (tipRef.current && !tipRef.current.contains(e.target)) {
+        setShowTip(false);
+      }
+    };
+    document.addEventListener("click", handler);
+    return () => document.removeEventListener("click", handler);
+  }, [showTip]);
+
+  // Don't render if already installed as PWA — AFTER all hooks
+  if (isInstalled) return null;
+
+  return (
+    <div className="relative inline-flex" ref={tipRef}>
+      <button
+        type="button"
+        onClick={handleInstallClick}
+        className="inline-flex h-8 w-8 items-center justify-center rounded-full text-base transition hover:bg-[var(--color-accent-soft)]"
+        aria-label="Установить приложение"
+        title="Установить приложение"
+      >
+        📲
+      </button>
+
+      {showTip && (
+        <div className="absolute right-0 top-full z-50 mt-2 w-60 rounded-xl border border-[var(--color-border)] bg-[var(--color-surface)] p-3 text-sm shadow-lg">
+          {isIOS ? (
+            <>
+              <p className="font-medium">Установка на iOS</p>
+              <ol className="mt-1.5 list-decimal pl-4 leading-relaxed text-[var(--color-text-muted)]">
+                <li>Откройте в <strong>Safari</strong></li>
+                <li>Нажмите <strong>Поделиться</strong> ⬆️</li>
+                <li>Выберите <strong>«На экран Домой»</strong></li>
+              </ol>
+            </>
+          ) : (
+            <>
+              <p className="font-medium">Установка</p>
+              <p className="mt-1 leading-relaxed text-[var(--color-text-muted)]">
+                Нажмите значок 📲 в адресной строке браузера или используйте меню <strong>«Установить приложение»</strong>.
+              </p>
+            </>
+          )}
+        </div>
+      )}
+    </div>
+  );
+};

src/layouts/AppShell.jsx

@@ -4,11 +4,15 @@ import { Badge } from "../components/UI/Badge";
 import { Button } from "../components/UI/Button";
 import { Panel } from "../components/UI/Panel";
 import { ThemeToggle } from "../components/UI/ThemeToggle";
+import { PwaInstallButton } from "../components/UI/PwaInstallButton";
 import { NotificationBell } from "../components/notifications/NotificationBell";
 import { NotificationSettings } from "../components/notifications/NotificationSettings";
 
 export const AppShell = ({
   user,
+  onInstallApp,
+  isInstalled,
+  isInstallAvailable,
   onSignOut,
   onOpenGuide,
   isGuideOpen = false,
@@ -108,6 +112,7 @@ export const AppShell = ({
                     {isGuideOpen ? "Назад" : "?"}
                   </Button>
                 ) : null}
+                <PwaInstallButton onInstall={onInstallApp} isInstalled={isInstalled} isInstallAvailable={isInstallAvailable} />
                 <ThemeToggle />
                 <Button size="sm" variant="ghost" onClick={onSignOut}>
                   Выйти
@@ -146,6 +151,7 @@ export const AppShell = ({
                     {isGuideOpen ? "Назад" : "?"}
                   </Button>
                 ) : null}
+                <PwaInstallButton onInstall={onInstallApp} isInstalled={isInstalled} isInstallAvailable={isInstallAvailable} />
                 <ThemeToggle />
               </div>
             </div>

src/pages/DashboardPage.jsx

@@ -8,6 +8,7 @@ import { ProductGuidePanel } from "../components/dashboard/ProductGuidePanel";
 import { useAuth } from "../context/AuthContext";
 import { useNotifications } from "../hooks/useNotifications";
 import { usePushNotifications } from "../hooks/usePushNotifications";
+import { usePwaStatus } from "../hooks/usePwaStatus";
 import { useOrderGroups } from "../hooks/useOrderGroups";
 import { AppShell } from "../layouts/AppShell";
 
@@ -53,6 +54,8 @@ export const DashboardPage = () => {
     }
   }, [isSupported, isSubscribed, user?.id, subscribe]);
 
+  const { isInstalled, isInstallAvailable, installApp: onInstallApp } = usePwaStatus();
+
   const {
     orderGroups,
     allOrderGroups,
@@ -143,6 +146,9 @@ export const DashboardPage = () => {
     <AppShell
       user={user}
       onSignOut={signOut}
+      onInstallApp={onInstallApp}
+      isInstalled={isInstalled}
+      isInstallAvailable={isInstallAvailable}
       onOpenGuide={() => setActiveSection((current) => (current === "guide" ? section.key : "guide"))}
       isGuideOpen={isGuideOpen}
       navItems={navItems}