fix(wireguard-dashboard): Fix RPC expect unwrapping, wizard interface naming and key persistence

- Change generateConfig/generateQR RPC declarations to use empty expect
  so error responses are not silently discarded by LuCI's RPC unwrapper
- Simplify handleShowQR to always check backend for stored key first
- Auto-detect next available interface name in wizard (wg1 if wg0 exists)
- Pass private key to addPeer in wizard's createPeers for QR persistence

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

package/secubox/luci-app-wireguard-dashboard/htdocs/luci-static/resources/view/wireguard-dashboard/peers.js

@@ -609,44 +609,27 @@ return view.extend({
 		var ifaceObj = interfaces.find(function(i) { return i.name === peer.interface; }) || {};
 
 		if (privateKey) {
+			// Have key in session - go straight to endpoint prompt
 			this.promptForEndpointAndShowQR(peer, ifaceObj, privateKey);
 			return;
 		}
 
-		// Try backend with empty private key - it will look up the stored key
+		// Check if backend has the stored key via a quick generateConfig test
-		var savedEndpoint = sessionStorage.getItem('wg_server_endpoint') || '';
+		API.generateConfig(peer.interface, peer.public_key, '', 'test').then(function(result) {
-		if (savedEndpoint) {
+			if (result && result.config && !result.error) {
-			API.generateQR(peer.interface, peer.public_key, '', savedEndpoint).then(function(result) {
+				// Backend has the key - prompt for endpoint, backend will handle the rest
-				if (result && result.qrcode && !result.error) {
+				self.promptForEndpointAndShowQR(peer, ifaceObj, '');
-					self.displayQRModal(peer, result.qrcode, result.config, false);
+			} else {
-				} else {
+				// No stored key - ask user manually
-					self.showPrivateKeyPrompt(peer, ifaceObj, function(key) {
-						self.promptForEndpointAndShowQR(peer, ifaceObj, key);
-					});
-				}
-			}).catch(function() {
 				self.showPrivateKeyPrompt(peer, ifaceObj, function(key) {
 					self.promptForEndpointAndShowQR(peer, ifaceObj, key);
 				});
+			}
+		}).catch(function() {
+			self.showPrivateKeyPrompt(peer, ifaceObj, function(key) {
+				self.promptForEndpointAndShowQR(peer, ifaceObj, key);
 			});
-		} else {
+		});
-			// No saved endpoint yet - need to prompt for endpoint first
-			// Try a test call to see if backend has the key
-			API.generateConfig(peer.interface, peer.public_key, '', 'test').then(function(result) {
-				if (result && result.config && !result.error) {
-					// Backend has the key, proceed with endpoint prompt
-					self.promptForEndpointAndShowQR(peer, ifaceObj, '');
-				} else {
-					self.showPrivateKeyPrompt(peer, ifaceObj, function(key) {
-						self.promptForEndpointAndShowQR(peer, ifaceObj, key);
-					});
-				}
-			}).catch(function() {
-				self.showPrivateKeyPrompt(peer, ifaceObj, function(key) {
-					self.promptForEndpointAndShowQR(peer, ifaceObj, key);
-				});
-			});
-		}
 	},
 
 	handleDownloadConfig: function(peer, interfaces, ev) {

package/secubox/luci-app-wireguard-dashboard/htdocs/luci-static/resources/view/wireguard-dashboard/wizard.js

@@ -135,6 +135,16 @@ return view.extend({
 		});
 	},
 
+	getNextInterfaceName: function(interfaces) {
+		var existing = interfaces.map(function(i) { return i.name; });
+		for (var i = 0; i < 100; i++) {
+			var name = 'wg' + i;
+			if (existing.indexOf(name) === -1)
+				return name;
+		}
+		return 'wg0';
+	},
+
 	render: function(data) {
 		var self = this;
 		// Handle RPC expect unwrapping - results may be array or object
@@ -145,6 +155,7 @@ return view.extend({
 
 		this.wizardData.publicIP = publicIP;
 		this.wizardData.existingInterfaces = interfaces;
+		this.wizardData.nextIfaceName = this.getNextInterfaceName(interfaces);
 
 		var view = E('div', { 'class': 'wg-wizard' }, [
 			E('link', { 'rel': 'stylesheet', 'href': L.resource('wireguard-dashboard/dashboard.css') }),
@@ -246,7 +257,7 @@ return view.extend({
 							'type': 'text',
 							'id': 'cfg-iface-name',
 							'class': 'wg-input',
-							'value': 'wg0',
+							'value': this.wizardData.nextIfaceName || 'wg0',
 							'placeholder': 'wg0'
 						}),
 						E('small', {}, _('Name for the WireGuard interface'))
@@ -633,7 +644,7 @@ return view.extend({
 
 					results.push(peerData);
 
-					// Add peer to interface
+					// Add peer to interface (include private key for QR persistence)
 					return api.addPeer(
 						data.ifaceName,
 						zone.name + '_' + (idx + 1),
@@ -641,7 +652,8 @@ return view.extend({
 						keys.public_key,
 						keys.preshared_key,
 						'',
-						zone.keepalive.toString()
+						zone.keepalive.toString(),
+						keys.private_key
 					);
 				})
 			);

package/secubox/luci-app-wireguard-dashboard/htdocs/luci-static/resources/wireguard-dashboard/api.js

@@ -65,14 +65,14 @@ var callGenerateConfig = rpc.declare({
 	object: 'luci.wireguard-dashboard',
 	method: 'generate_config',
 	params: ['interface', 'peer', 'private_key', 'endpoint'],
-	expect: { config: '' }
+	expect: { }
 });
 
 var callGenerateQR = rpc.declare({
 	object: 'luci.wireguard-dashboard',
 	method: 'generate_qr',
 	params: ['interface', 'peer', 'private_key', 'endpoint'],
-	expect: { qrcode: '' }
+	expect: { }
 });
 
 var callGetTraffic = rpc.declare({