fix: address final PWA review findings

src/lib/useInstallPrompt.ts

@@ -7,6 +7,32 @@ interface BeforeInstallPromptEvent extends Event {
   userChoice: Promise<{ outcome: "accepted" | "dismissed"; platform: string }>;
 }
 
+const DISMISSED_STORAGE_KEY = "agendamax-install-dismissed";
+
+function hasDismissedPrompt() {
+  try {
+    return window.sessionStorage.getItem(DISMISSED_STORAGE_KEY) === "1";
+  } catch {
+    return false;
+  }
+}
+
+function clearDismissedPrompt() {
+  try {
+    window.sessionStorage.removeItem(DISMISSED_STORAGE_KEY);
+  } catch {
+    // Storage can be unavailable in privacy-restricted browsers.
+  }
+}
+
+function persistDismissedPrompt() {
+  try {
+    window.sessionStorage.setItem(DISMISSED_STORAGE_KEY, "1");
+  } catch {
+    // Storage can be unavailable in privacy-restricted browsers.
+  }
+}
+
 function isStandalone() {
   return window.matchMedia("(display-mode: standalone)").matches ||
     ("standalone" in navigator && Boolean((navigator as Navigator & { standalone?: boolean }).standalone));
@@ -25,7 +51,7 @@ export function useInstallPrompt() {
     return isIOSSafari() ? "ios-instructions" : "unsupported";
   });
   const [deferred, setDeferred] = useState<BeforeInstallPromptEvent | null>(null);
-  const [dismissed, setDismissed] = useState(false);
+  const [dismissed, setDismissed] = useState(() => typeof window !== "undefined" && hasDismissedPrompt());
   const installInFlight = useRef(false);
 
   useEffect(() => {
@@ -37,10 +63,11 @@ export function useInstallPrompt() {
     const onBeforeInstallPrompt = (event: Event) => {
       event.preventDefault();
       setDeferred(event as BeforeInstallPromptEvent);
-      setState("available");
+      if (!hasDismissedPrompt()) setState("available");
     };
     const onInstalled = () => {
       setDeferred(null);
+      clearDismissedPrompt();
       setDismissed(false);
       setState("installed");
     };
@@ -62,7 +89,10 @@ export function useInstallPrompt() {
       await event.prompt();
       const choice = await event.userChoice;
       if (choice.outcome === "accepted") setState("installed");
-      else setDismissed(true);
+      else {
+        persistDismissedPrompt();
+        setDismissed(true);
+      }
     } catch {
       setDeferred(event);
       setState("available");