diff --git a/gui/main-kf5.qml b/gui/main-kf5.qml
index 029c70d..b468775 100644
--- a/gui/main-kf5.qml
+++ b/gui/main-kf5.qml
@@ -39,6 +39,7 @@ ApplicationWindow {
         dark: theme.darkColor
         light: theme.lightColor
         shadow: theme.shadowColor
+        placeholderText: theme.placeholderTextColor
     }
 
     // --- Settings Dialog ---
@@ -179,9 +180,77 @@ ApplicationWindow {
     }
 
     function openNewSessionDialog() {
-        var path = theme.chooseFolder("Choose working directory for new session")
-        if (path !== "")
-            dbus.createSession(path)
+        newSessionDialog.backendModel = dbus.listBackends()
+        newSessionDialog.cwdField.text = dbus.activeCwd || ""
+        newSessionDialog.backendCombo.currentIndex = 0
+        newSessionDialog.modelCombo.editText = ""
+        newSessionDialog.open()
+    }
+
+    Dialog {
+        id: newSessionDialog
+        title: "New Session"
+        modal: true
+        anchors.centerIn: parent
+        width: 450
+        standardButtons: Dialog.Ok | Dialog.Cancel
+
+        property alias cwdField: cwdInput
+        property alias backendCombo: backendSelect
+        property alias modelCombo: modelSelect
+        property var backendModel: []
+
+        onAccepted: {
+            var cwd = cwdInput.text.trim()
+            if (cwd === "") cwd = dbus.activeCwd || ""
+            var backend = backendSelect.currentText
+            var model = modelSelect.editText.trim() || modelSelect.currentText
+            dbus.createSession(cwd, backend, model)
+        }
+
+        GridLayout {
+            columns: 2
+            width: parent.width
+            columnSpacing: 10
+            rowSpacing: 8
+
+            Label { text: "Working directory:" }
+            RowLayout {
+                Layout.fillWidth: true
+                TextField {
+                    id: cwdInput
+                    Layout.fillWidth: true
+                    placeholderText: "/home/user/project"
+                }
+                Button {
+                    text: "Browse"
+                    onClicked: {
+                        var path = theme.chooseFolder("Choose working directory", cwdInput.text)
+                        if (path !== "")
+                            cwdInput.text = path
+                    }
+                }
+            }
+
+            Label { text: "Backend:" }
+            ComboBox {
+                id: backendSelect
+                Layout.fillWidth: true
+                model: newSessionDialog.backendModel
+                onCurrentTextChanged: {
+                    if (currentText)
+                        modelSelect.model = dbus.listModelsByBackend(currentText)
+                }
+            }
+
+            Label { text: "Model:" }
+            ComboBox {
+                id: modelSelect
+                Layout.fillWidth: true
+                editable: true
+                editText: ""
+            }
+        }
     }
 
     function openCwdDialog() {
@@ -209,6 +278,15 @@ ApplicationWindow {
             property real panX: 0
             property real panY: 0
             property real zoom: 1.0
+            property real minZoom: 0.3
+            property real maxZoom: 3.0
+
+            function stateColor(state) {
+                if (state === "idle") return "#4caf50"
+                if (state && state.startsWith("calling")) return "#ff9800"
+                if (state === "thinking") return "#2196f3"
+                return "#2196f3"
+            }
 
             function layoutNodes() {
                 var positions = {}
@@ -257,7 +335,13 @@ ApplicationWindow {
                 }
                 onWheel: {
                     var factor = wheel.angleDelta.y > 0 ? 1.15 : 0.87
-                    graphRoot.zoom = Math.max(0.3, Math.min(3.0, graphRoot.zoom * factor))
+                    var newZoom = Math.max(graphRoot.minZoom, Math.min(graphRoot.maxZoom, graphRoot.zoom * factor))
+                    // Zoom toward mouse position
+                    var mx = wheel.x - graphRoot.panX
+                    var my = wheel.y - graphRoot.panY
+                    graphRoot.panX -= mx * (newZoom / graphRoot.zoom - 1)
+                    graphRoot.panY -= my * (newZoom / graphRoot.zoom - 1)
+                    graphRoot.zoom = newZoom
                 }
             }
 
@@ -324,12 +408,7 @@ ApplicationWindow {
                         height: 50
                         radius: 8
                         color: palette.base
-                        border.color: {
-                            var st = modelData.state
-                            if (st === "idle") return "#4caf50"
-                            if (st && st.startsWith("calling")) return "#ff9800"
-                            return "#2196f3"
-                        }
+                        border.color: graphRoot.stateColor(modelData.state)
                         border.width: modelData.id === dbus.activeSessionId ? 3 : 2
                         x: {
                             var pos = graphRoot.nodePositions[modelData.id]
@@ -364,12 +443,7 @@ ApplicationWindow {
                                 font.pixelSize: 9
                                 opacity: 0.7
                                 anchors.horizontalCenter: parent.horizontalCenter
-                                color: {
-                                    var st = modelData.state
-                                    if (st === "idle") return "#4caf50"
-                                    if (st && st.startsWith("calling")) return "#ff9800"
-                                    return "#2196f3"
-                                }
+                                color: graphRoot.stateColor(modelData.state)
                             }
                         }
 
@@ -707,6 +781,24 @@ ApplicationWindow {
                 mainContent.panes[idx].sessionId = dbus.activeSessionId
             }
         }
+        function onErrorOccurred(message) {
+            errorDialog.text = message
+            errorDialog.open()
+        }
+    }
+
+    Dialog {
+        id: errorDialog
+        title: "Error"
+        modal: true
+        anchors.centerIn: parent
+        standardButtons: Dialog.Ok
+        property alias text: errorLabel.text
+        Label {
+            id: errorLabel
+            wrapMode: Text.Wrap
+            width: parent.width
+        }
     }
 
     // --- Inline ChatPane Component ---
@@ -1251,6 +1343,7 @@ ApplicationWindow {
                             sourceComponent: subBlock.type === "code" ? codeSubDelegate
                                 : subBlock.type === "diff" ? diffSubDelegate
                                 : subBlock.type === "interrupt" ? interruptSubDelegate
+                                : subBlock.type === "video" ? videoSubDelegate
                                 : proseSubDelegate
                         }
                     }
@@ -1315,6 +1408,7 @@ ApplicationWindow {
                             sourceComponent: subBlock.type === "code" ? codeSubDelegate
                                 : subBlock.type === "diff" ? diffSubDelegate
                                 : subBlock.type === "interrupt" ? interruptSubDelegate
+                                : subBlock.type === "video" ? videoSubDelegate
                                 : proseSubDelegate
                         }
                     }
@@ -1414,6 +1508,7 @@ ApplicationWindow {
                         sourceComponent: subBlock.type === "code" ? codeSubDelegate
                             : subBlock.type === "diff" ? diffSubDelegate
                             : subBlock.type === "interrupt" ? interruptSubDelegate
+                            : subBlock.type === "video" ? videoSubDelegate
                             : plainSubDelegate
                     }
                 }
@@ -1475,6 +1570,7 @@ ApplicationWindow {
                         sourceComponent: subBlock.type === "code" ? codeSubDelegate
                             : subBlock.type === "diff" ? diffSubDelegate
                             : subBlock.type === "interrupt" ? interruptSubDelegate
+                            : subBlock.type === "video" ? videoSubDelegate
                             : plainSubDelegate
                     }
                 }
@@ -1591,6 +1687,78 @@ ApplicationWindow {
         }
     }
 
+    Component {
+        id: videoSubDelegate
+        Item {
+            id: videoItem
+            width: parent ? parent.width : 400
+            height: Math.max(200, Math.min(width * 9/16, 360))
+
+            property string videoUrl: subBlock.content || ""
+            property bool isDirectMedia: /\.(mp4|webm|ogv|m3u8)(\?|$)/i.test(videoUrl)
+            property string youtubeId: {
+                var m = videoUrl.match(/[?&]v=([^&]+)/) || videoUrl.match(/youtu\.be\/([^?]+)/)
+                return m ? m[1] : ""
+            }
+
+            // Non-direct: thumbnail card that opens in browser
+            Rectangle {
+                anchors.fill: parent
+                color: "#181818"
+                radius: 8
+                clip: true
+
+                // YouTube thumbnail
+                Image {
+                    anchors.fill: parent
+                    source: videoItem.youtubeId !== "" ?
+                        "https://img.youtube.com/vi/" + videoItem.youtubeId + "/hqdefault.jpg" : ""
+                    fillMode: Image.PreserveAspectCrop
+                    visible: videoItem.youtubeId !== ""
+                }
+
+                // Play button overlay
+                Rectangle {
+                    anchors.centerIn: parent
+                    width: 72; height: 72
+                    radius: 36
+                    color: "#aa000000"
+                    Text {
+                        anchors.centerIn: parent
+                        text: "\u25B6"
+                        font.pixelSize: 36
+                        color: "white"
+                    }
+                }
+
+                // URL label at bottom
+                Rectangle {
+                    anchors.bottom: parent.bottom
+                    anchors.left: parent.left
+                    anchors.right: parent.right
+                    height: 28
+                    color: "#cc000000"
+                    radius: 4
+                    Text {
+                        anchors.centerIn: parent
+                        width: parent.width - 16
+                        text: videoItem.videoUrl
+                        color: "#ccc"
+                        font.pixelSize: 11
+                        elide: Text.ElideMiddle
+                        horizontalAlignment: Text.AlignHCenter
+                    }
+                }
+
+                MouseArea {
+                    anchors.fill: parent
+                    cursorShape: Qt.PointingHandCursor
+                    onClicked: Qt.openUrlExternally(videoItem.videoUrl)
+                }
+            }
+        }
+    }
+
     Component {
         id: codeSubDelegate
         Rectangle {