Pwa support, maybe

apps/demo/index.html

@@ -4,6 +4,11 @@
     <meta charset="UTF-8" />
     <meta name="viewport" content="width=device-width, initial-scale=1, viewport-fit=cover, user-scalable=no" />
     <meta name="theme-color" content="#0b0d12" />
+    <meta name="apple-mobile-web-app-capable" content="yes" />
+    <meta name="apple-mobile-web-app-status-bar-style" content="black-translucent" />
+    <meta name="apple-mobile-web-app-title" content="NVR Messenger" />
+    <meta name="format-detection" content="telephone=no" />
+    <link rel="apple-touch-icon" sizes="180x180" href="/apple-touch-icon.png" />
     <link rel="icon" href="/favicon.svg" />
     <title>Native Vue Messenger</title>
   </head>

apps/demo/src/main.ts

@@ -3,13 +3,17 @@ import { createNativeRouter } from '@native-vue-router/core'
 import { createCapacitorAdapter } from '@native-vue-router/capacitor'
 import { createElectronRendererAdapter } from '@native-vue-router/electron'
 import App from './App.vue'
+import { createPwaAdapter } from './pwa'
 import { router } from './router'
 import './style.css'
 
 const isElectron = navigator.userAgent.toLowerCase().includes('electron')
+const capacitorPlatform = createCapacitorAdapter({ haptics: true, exitAtRoot: true })
 const platform = isElectron
   ? createElectronRendererAdapter()
-  : createCapacitorAdapter({ haptics: true, exitAtRoot: true })
+  : capacitorPlatform.name !== 'capacitor-web'
+    ? capacitorPlatform
+    : createPwaAdapter()
 
 const nativeRouter = createNativeRouter({
   router,

apps/demo/src/pwa.ts

@@ -0,0 +1,112 @@
+import { reactive, readonly } from 'vue'
+import type { NativePlatformAdapter } from '@native-vue-router/core'
+
+interface StandaloneNavigator extends Navigator {
+  standalone?: boolean
+}
+
+type ServiceWorkerState = 'unsupported' | 'installing' | 'ready'
+
+const state = reactive({
+  ios: false,
+  standalone: false,
+  edgeGuard: false,
+  edgeClaims: 0,
+  serviceWorker: 'installing' as ServiceWorkerState,
+})
+
+export const pwaEnvironment = readonly(state)
+
+export function isIOSWebKit() {
+  const navigatorWithTouch = navigator as Navigator & { maxTouchPoints?: number }
+  return /iPad|iPhone|iPod/.test(navigator.userAgent)
+    || (/Macintosh/.test(navigator.userAgent) && (navigatorWithTouch.maxTouchPoints ?? 0) > 1)
+}
+
+export function isStandalonePwa() {
+  return Boolean((navigator as StandaloneNavigator).standalone)
+    || window.matchMedia('(display-mode: standalone)').matches
+    || window.matchMedia('(display-mode: fullscreen)').matches
+}
+
+function updateEnvironment() {
+  state.ios = isIOSWebKit()
+  state.standalone = isStandalonePwa()
+  state.edgeGuard = state.ios && state.standalone
+  document.documentElement.dataset.pwaPlatform = state.ios ? 'ios' : 'other'
+  document.documentElement.dataset.pwaDisplayMode = state.standalone ? 'standalone' : 'browser'
+  document.documentElement.dataset.pwaEdgeGuard = state.edgeGuard ? 'active' : 'inactive'
+}
+
+export interface PwaAdapterOptions {
+  edgeWidth?: number
+}
+
+/**
+ * Reserves the leading edge in an installed iOS Home Screen app before
+ * WebKit can turn the touch into back/forward history navigation.
+ *
+ * Safari does not expose WKWebView's native gesture switch to web content,
+ * so this is deliberately scoped to standalone mode and reinforced by CSS.
+ */
+export function createPwaAdapter(options: PwaAdapterOptions = {}): NativePlatformAdapter {
+  const edgeWidth = options.edgeWidth ?? 32
+  return {
+    name: 'pwa',
+    install() {
+      updateEnvironment()
+      const displayMode = window.matchMedia('(display-mode: standalone)')
+      const update = () => updateEnvironment()
+      displayMode.addEventListener('change', update)
+      document.addEventListener('visibilitychange', update)
+
+      if (!('serviceWorker' in navigator)) state.serviceWorker = 'unsupported'
+      else {
+        state.serviceWorker = navigator.serviceWorker.controller ? 'ready' : 'installing'
+        void navigator.serviceWorker.ready.then(() => { state.serviceWorker = 'ready' })
+        navigator.serviceWorker.addEventListener('controllerchange', updateServiceWorkerState)
+      }
+
+      let reservedTouch: number | null = null
+      const touchAtLeadingEdge = (event: TouchEvent) => {
+        if (!state.edgeGuard || event.touches.length !== 1) return undefined
+        if (!(event.target instanceof Element) || !event.target.closest('.nvr-navigator')) return undefined
+        const touch = event.touches[0]
+        const rtl = getComputedStyle(document.documentElement).direction === 'rtl'
+        const atEdge = rtl ? window.innerWidth - touch.clientX <= edgeWidth : touch.clientX <= edgeWidth
+        return atEdge ? touch : undefined
+      }
+      const reserveEdge = (event: TouchEvent) => {
+        const touch = touchAtLeadingEdge(event)
+        if (!touch) return
+        reservedTouch = touch.identifier
+        state.edgeClaims += 1
+        event.preventDefault()
+      }
+      const holdEdge = (event: TouchEvent) => {
+        if (reservedTouch === null) return
+        if ([...event.touches].some((touch) => touch.identifier === reservedTouch)) event.preventDefault()
+      }
+      const releaseEdge = () => { reservedTouch = null }
+
+      document.addEventListener('touchstart', reserveEdge, { capture: true, passive: false })
+      document.addEventListener('touchmove', holdEdge, { capture: true, passive: false })
+      document.addEventListener('touchend', releaseEdge, { capture: true, passive: true })
+      document.addEventListener('touchcancel', releaseEdge, { capture: true, passive: true })
+
+      return () => {
+        displayMode.removeEventListener('change', update)
+        document.removeEventListener('visibilitychange', update)
+        if ('serviceWorker' in navigator) navigator.serviceWorker.removeEventListener('controllerchange', updateServiceWorkerState)
+        document.removeEventListener('touchstart', reserveEdge, true)
+        document.removeEventListener('touchmove', holdEdge, true)
+        document.removeEventListener('touchend', releaseEdge, true)
+        document.removeEventListener('touchcancel', releaseEdge, true)
+      }
+    },
+  }
+}
+
+function updateServiceWorkerState() {
+  state.serviceWorker = 'ready'
+}

apps/demo/src/style.css

@@ -15,7 +15,7 @@
 }
 
 * { box-sizing: border-box; }
-html, body, #app { width: 100%; height: 100%; margin: 0; overflow: hidden; }
+html, body, #app { width: 100%; height: 100%; margin: 0; overflow: hidden; overscroll-behavior: none; }
 button, input { font: inherit; }
 button, a { -webkit-tap-highlight-color: transparent; }
 button { color: inherit; }
@@ -27,6 +27,12 @@ body {
     #050608;
 }
 
+html[data-pwa-edge-guard="active"],
+html[data-pwa-edge-guard="active"] body {
+  overscroll-behavior-x: none;
+  -webkit-user-select: none;
+}
+
 .app-frame {
   position: relative;
   width: 100%;

apps/demo/src/views/SettingsView.vue

@@ -1,6 +1,7 @@
 <script setup lang="ts">
 import AppHeader from '../components/AppHeader.vue'
 import { useDemoStore } from '../data'
+import { pwaEnvironment } from '../pwa'
 
 const store = useDemoStore()
 </script>
@@ -12,6 +13,14 @@ const store = useDemoStore()
       <span>60</span>
       <div><strong>FPS baseline</strong><p>Interactive layers use transform and opacity only.</p></div>
     </section>
+    <section class="settings-group">
+      <h2>PWA environment</h2>
+      <div><span><strong>Display mode</strong><small>Home Screen installation state</small></span><b :class="{ offline: !pwaEnvironment.standalone }">{{ pwaEnvironment.standalone ? 'Standalone' : 'Browser tab' }}</b></div>
+      <div><span><strong>Offline worker</strong><small>Cached application shell</small></span><b :class="{ offline: pwaEnvironment.serviceWorker !== 'ready' }">{{ pwaEnvironment.serviceWorker }}</b></div>
+      <div><span><strong>iOS edge ownership</strong><small>Leading-edge touches claimed by this app: {{ pwaEnvironment.edgeClaims }}</small></span><b :class="{ offline: !pwaEnvironment.edgeGuard }">{{ pwaEnvironment.edgeGuard ? 'App reserved' : pwaEnvironment.ios ? 'Install required' : 'Not iOS' }}</b></div>
+      <p v-if="pwaEnvironment.ios && !pwaEnvironment.standalone">In Safari, choose Share → Add to Home Screen, then launch the new icon. Edge interception is intentionally disabled inside a normal browser tab.</p>
+      <p v-else-if="pwaEnvironment.ios">The leading edge is reserved before WebKit navigation begins. Open a conversation and drag from the extreme left edge to verify the live back preview.</p>
+    </section>
     <section class="settings-group">
       <h2>Simulation</h2>
       <label><span><strong>Network latency</strong><small>{{ store.settings.simulatedLatency }} ms</small></span><input v-model.number="store.settings.simulatedLatency" type="range" min="0" max="1200" step="20" /></label>