feat(webapp): add offline shell and iPhone install guidance

WebApp/src/lib/pwa.ts

@@ -1,52 +1,98 @@
 import { writable } from 'svelte/store';
 
+const IOS_HINT_DISMISSED_KEY = 'phonecam-ios-install-hint-dismissed';
+
 const createInitialState = () => ({
 	installAvailable: false,
 	updateAvailable: false,
 	offlineReady: false,
-	installing: false
+	installing: false,
+	isOffline: false,
+	isStandalone: false,
+	showIosInstallHint: false
 });
 
 export const pwaState = writable(createInitialState());
 
 let deferredInstallPrompt: any = null;
 
-export const setInstallPrompt = (event: any) => {
-	deferredInstallPrompt = event;
+const setPwaState = (partial: Record<string, unknown>) => {
 	pwaState.update((state) => ({
 		...state,
-		installAvailable: true
+		...partial
 	}));
 };
 
+export const setInstallPrompt = (event: any) => {
+	deferredInstallPrompt = event;
+	setPwaState({
+		installAvailable: true
+	});
+};
+
 export const clearInstallPrompt = () => {
 	deferredInstallPrompt = null;
-	pwaState.update((state) => ({
-		...state,
+	setPwaState({
 		installAvailable: false,
 		installing: false
-	}));
+	});
 };
 
 export const setUpdateAvailable = (updateAvailable: boolean) => {
-	pwaState.update((state) => ({
-		...state,
-		updateAvailable
-	}));
+	setPwaState({ updateAvailable });
 };
 
 export const setOfflineReady = (offlineReady: boolean) => {
-	pwaState.update((state) => ({
-		...state,
-		offlineReady
-	}));
+	setPwaState({ offlineReady });
 };
 
 export const dismissOfflineReady = () => {
-	pwaState.update((state) => ({
-		...state,
-		offlineReady: false
-	}));
+	setPwaState({ offlineReady: false });
+};
+
+export const setOnlineStatus = (isOnline: boolean) => {
+	setPwaState({ isOffline: !isOnline });
+};
+
+export const setStandaloneMode = (isStandalone: boolean) => {
+	setPwaState({ isStandalone });
+};
+
+const isIosSafariInstallable = () => {
+	if (typeof window === 'undefined' || typeof navigator === 'undefined') {
+		return false;
+	}
+
+	const userAgent = navigator.userAgent || '';
+	const isIos = /iPad|iPhone|iPod/.test(userAgent);
+	const isWebkit = /WebKit/.test(userAgent);
+	const isCriOS = /CriOS/.test(userAgent);
+	const isFxiOS = /FxiOS/.test(userAgent);
+
+	return isIos && isWebkit && !isCriOS && !isFxiOS;
+};
+
+export const syncInstallHelpState = () => {
+	if (typeof window === 'undefined') {
+		return;
+	}
+
+	const isStandalone =
+		window.matchMedia?.('(display-mode: standalone)').matches || (window.navigator as any)?.standalone === true;
+	const dismissed =
+		typeof localStorage !== 'undefined' && localStorage.getItem(IOS_HINT_DISMISSED_KEY) === 'true';
+
+	setPwaState({
+		isStandalone,
+		showIosInstallHint: isIosSafariInstallable() && !isStandalone && !dismissed && !deferredInstallPrompt
+	});
+};
+
+export const dismissIosInstallHint = () => {
+	if (typeof localStorage !== 'undefined') {
+		localStorage.setItem(IOS_HINT_DISMISSED_KEY, 'true');
+	}
+	setPwaState({ showIosInstallHint: false });
 };
 
 export const promptInstall = async () => {
@@ -54,21 +100,20 @@ export const promptInstall = async () => {
 		return false;
 	}
 
-	pwaState.update((state) => ({
-		...state,
+	setPwaState({
 		installing: true
-	}));
+	});
 
 	try {
 		await deferredInstallPrompt.prompt();
 		const choice = await deferredInstallPrompt.userChoice;
 		clearInstallPrompt();
+		syncInstallHelpState();
 		return choice?.outcome === 'accepted';
 	} catch (error) {
-		pwaState.update((state) => ({
-			...state,
+		setPwaState({
 			installing: false
-		}));
+		});
 		throw error;
 	}
 };

WebApp/src/lib/sim/ui/AppChrome.svelte

@@ -1,7 +1,7 @@
 <script lang="ts">
 	// @ts-nocheck
 	import { appController } from '$lib/app/controller';
-	import { dismissOfflineReady, promptInstall, pwaState } from '$lib/pwa';
+	import { dismissIosInstallHint, dismissOfflineReady, promptInstall, pwaState } from '$lib/pwa';
 	import { appState, unreadNotificationsCount } from '$lib/app/store';
 	import { Alert, AlertAction, AlertDescription, AlertTitle } from '$lib/components/ui/alert/index.js';
 	import { Avatar, AvatarFallback } from '$lib/components/ui/avatar/index.js';
@@ -40,6 +40,11 @@
 	const reloadForUpdate = () => {
 		window.location.reload();
 	};
+	const offlineTitle = () => ($appState.session ? 'Offline Shell Mode' : 'Offline');
+	const offlineDescription = () =>
+		$appState.session
+			? 'Cached screens remain available, but sign-in refresh, live monitoring, camera control, and realtime updates need connectivity.'
+			: 'You can open the cached shell, but sign-in and device setup need an internet connection.';
 </script>
 
 <div data-sim-page={pageKey} class="flex h-full w-full">
@@ -87,6 +92,20 @@
 			</Alert>
 		{/if}
 
+		{#if $pwaState.showIosInstallHint}
+			<Alert class="glass-card border-white/10 bg-background/95 shadow-lg">
+				<AlertTitle class="text-xs">Install on iPhone</AlertTitle>
+				<AlertDescription class="pr-8 text-xs text-gray-300">
+					In Safari, tap the Share button, then choose “Add to Home Screen” to install PhoneCam.
+				</AlertDescription>
+				<AlertAction>
+					<Button variant="ghost" size="sm" class="text-gray-300" onclick={dismissIosInstallHint}>
+						Got it
+					</Button>
+				</AlertAction>
+			</Alert>
+		{/if}
+
 		{#if $pwaState.updateAvailable}
 			<Alert class="glass-card border-blue-500/20 bg-background/95 shadow-lg">
 				<AlertTitle class="text-xs">Update Ready</AlertTitle>
@@ -255,6 +274,16 @@
 	</aside>
 
 	<main class="flex-1 flex flex-col h-full overflow-hidden relative">
+		{#if $pwaState.isOffline}
+			<div class="px-4 pt-4 md:px-8 md:pt-6 lg:px-10">
+				<Alert class="glass-card border-amber-500/20 bg-[#141418]/95 shadow-lg">
+					<AlertTitle class="text-xs uppercase tracking-wide text-amber-300">{offlineTitle()}</AlertTitle>
+					<AlertDescription class="text-xs text-gray-300">
+						{offlineDescription()}
+					</AlertDescription>
+				</Alert>
+			</div>
+		{/if}
 		<div class="flex-1 overflow-y-auto p-4 md:p-8 lg:p-10 relative">
 			{@render children()}
 		</div>