fix(qml): correzioni Silica post-primo-test su device (v0.1.1)

Pagine non caricabili ("Impossibile caricare la pagina") per API
inesistenti nella Silica del kit Sailfish 5.1 / Qt 5.6 — verificate
sui docs ufficiali (pagine -members) e incrociate coi pattern
provati su device (tide/calibreweb/quill):

- TextField: rimosso onAccepted (segnale "accepted" inesistente)
  -> EnterKey.enabled/.onClicked (LoginPage, ChatPage)
- Button: rimosso "highlighted" (inesistente su Button) dal mic
- ComboBox: menu con MenuItem espliciti (via Repeater non provato)
- Theme.highlightDimmerColor -> Theme.rgba(highlightBackgroundColor)
- Azioni nei menu instradate via funzioni della Page (pattern tide)
- SessionsPage: titolo delegato piu' robusto (no "undefined")

qml/pages/SettingsPage.qml

@@ -43,13 +43,27 @@ Page {
             ComboBox {
                 label: qsTr("Read-aloud voice")
                 currentIndex: Math.max(0, page.voiceNames.indexOf(appSettings.ttsVoice))
+                // MenuItems espliciti (no Repeater: pattern non provato sul kit 5.1)
                 menu: ContextMenu {
-                    Repeater {
-                        model: page.voiceNames
-                        MenuItem {
-                            text: modelData
-                            onClicked: appSettings.ttsVoice = modelData
-                        }
+                    MenuItem {
+                        text: "it-IT-ElsaNeural"
+                        onClicked: appSettings.ttsVoice = "it-IT-ElsaNeural"
+                    }
+                    MenuItem {
+                        text: "it-IT-DiegoNeural"
+                        onClicked: appSettings.ttsVoice = "it-IT-DiegoNeural"
+                    }
+                    MenuItem {
+                        text: "it-IT-IsabellaNeural"
+                        onClicked: appSettings.ttsVoice = "it-IT-IsabellaNeural"
+                    }
+                    MenuItem {
+                        text: "it-IT-GiuseppeMultilingualNeural"
+                        onClicked: appSettings.ttsVoice = "it-IT-GiuseppeMultilingualNeural"
+                    }
+                    MenuItem {
+                        text: "en-US-AriaNeural"
+                        onClicked: appSettings.ttsVoice = "en-US-AriaNeural"
                     }
                 }
             }
@@ -58,12 +72,17 @@ Page {
                 label: qsTr("TTS engine")
                 currentIndex: Math.max(0, page.engineNames.indexOf(appSettings.ttsEngine))
                 menu: ContextMenu {
-                    Repeater {
-                        model: page.engineNames
-                        MenuItem {
-                            text: modelData
-                            onClicked: appSettings.ttsEngine = modelData
-                        }
+                    MenuItem {
+                        text: "edge"
+                        onClicked: appSettings.ttsEngine = "edge"
+                    }
+                    MenuItem {
+                        text: "openai"
+                        onClicked: appSettings.ttsEngine = "openai"
+                    }
+                    MenuItem {
+                        text: "elevenlabs"
+                        onClicked: appSettings.ttsEngine = "elevenlabs"
                     }
                 }
             }
@@ -80,10 +99,7 @@ Page {
             Button {
                 anchors.horizontalCenter: parent.horizontalCenter
                 text: qsTr("Sign out")
-                onClicked: {
-                    api.logout()
-                    pageStack.replace(Qt.resolvedUrl("LoginPage.qml"))
-                }
+                onClicked: page.signOut()
             }
 
             SectionHeader { text: qsTr("About") }
@@ -104,5 +120,10 @@ Page {
         VerticalScrollDecorator {}
     }
 
+    function signOut() {
+        api.logout()
+        pageStack.replace(Qt.resolvedUrl("LoginPage.qml"))
+    }
+
     Component.onCompleted: urlField.text = appSettings.baseUrl
 }