New lightmode and darkmode themes with UI revamp.

Signed-off-by: Adam Treat <treat.adam@gmail.com>

gpt4all-chat/qml/MySlug.qml

@@ -0,0 +1,24 @@
+import QtCore
+import QtQuick
+import QtQuick.Controls
+import QtQuick.Controls.Basic
+
+Label {
+    id: mySlug
+    padding: 3
+    rightPadding: 9
+    leftPadding: 9
+    font.pixelSize: theme.fontSizeFixedSmall
+    background: Rectangle {
+        radius: 6
+        border.width: 1
+        border.color: mySlug.color
+        color: theme.slugBackground
+    }
+    ToolTip.visible: ma.containsMouse && ToolTip.text !== ""
+    MouseArea {
+        id: ma
+        anchors.fill: parent
+        hoverEnabled: true
+    }
+}