feat(pos): Capacitor mobile app setup — Android + iOS wrapper

Set up Capacitor to wrap the Nexus POS web app as a native mobile app.
The app loads from the remote server URL so no bundling is needed.
Includes native-bridge.js for camera, push notifications, haptics,
and status bar integration when running inside the native shell.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

pos/static/js/native-bridge.js

@@ -0,0 +1,72 @@
+// native-bridge.js — Detects if running inside Capacitor native app
+// and provides native API access (camera for barcode, push notifications, haptics)
+
+(function() {
+    'use strict';
+
+    window.NexusNative = {
+        isNative: typeof Capacitor !== 'undefined',
+
+        // Camera for barcode scanning
+        async scanBarcode() {
+            if (!this.isNative) return null;
+            try {
+                const { Camera } = await import('@capacitor/camera');
+                const photo = await Camera.getPhoto({
+                    quality: 90,
+                    resultType: 'base64'
+                });
+                // In production, send to a barcode decode service
+                return photo;
+            } catch(e) {
+                return null;
+            }
+        },
+
+        // Push notification registration
+        async registerPush() {
+            if (!this.isNative) return null;
+            try {
+                const { PushNotifications } = await import('@capacitor/push-notifications');
+                const result = await PushNotifications.requestPermissions();
+                if (result.receive === 'granted') {
+                    await PushNotifications.register();
+                }
+                PushNotifications.addListener('registration', token => {
+                    console.log('Push token:', token.value);
+                    // Send token to server for this employee
+                });
+                PushNotifications.addListener('pushNotificationReceived', notification => {
+                    console.log('Push received:', notification);
+                });
+            } catch(e) {
+                console.log('Push not available:', e);
+            }
+        },
+
+        // Haptic feedback
+        async vibrate() {
+            if (!this.isNative) return;
+            try {
+                const { Haptics, ImpactStyle } = await import('@capacitor/haptics');
+                await Haptics.impact({ style: ImpactStyle.Light });
+            } catch(e) {}
+        },
+
+        // Status bar (hide for fullscreen POS)
+        async setupStatusBar() {
+            if (!this.isNative) return;
+            try {
+                const { StatusBar, Style } = await import('@capacitor/status-bar');
+                await StatusBar.setStyle({ style: Style.Dark });
+                await StatusBar.setBackgroundColor({ color: '#0d0d0d' });
+            } catch(e) {}
+        }
+    };
+
+    // Auto-init if native
+    if (window.NexusNative.isNative) {
+        window.NexusNative.setupStatusBar();
+        window.NexusNative.registerPush();
+    }
+})();