feat(ai): auto-resize input with scroll (#3148)

dots/.config/quickshell/ii/modules/ii/sidebarLeft/AiChat.qml

@@ -497,17 +497,24 @@ Inline w/ backslash and round brackets \\(e^{i\\pi} + 1 = 0\\)
             RowLayout { // Input field and send button
                 id: inputFieldRowLayout
                 anchors {
-                    top: attachedFileIndicator.bottom
+                    bottom: commandButtonsRow.top
                     left: parent.left
                     right: parent.right
-                    topMargin: 5
+                    bottomMargin: 5
                 }
                 spacing: 0
 
-                StyledTextArea { // The actual TextArea
-                    id: messageInputField
-                    wrapMode: TextArea.Wrap
+                ScrollView {
+                    id: inputScrollView
                     Layout.fillWidth: true
+                    Layout.preferredHeight: Math.min(root.height * 3/5, messageInputField.height)
+                    clip: true
+                    ScrollBar.vertical.policy: ScrollBar.AsNeeded
+
+                    StyledTextArea { // The actual TextArea (inside ScrollView to enable scrolling)
+                        id: messageInputField
+                        anchors.fill: parent
+                        wrapMode: TextArea.Wrap
                         padding: 10
                         color: activeFocus ? Appearance.m3colors.m3onSurface : Appearance.m3colors.m3onSurfaceVariant
                         placeholderText: Translation.tr('Message the model... "%1" for commands').arg(root.commandPrefix)
@@ -686,10 +693,10 @@ Inline w/ backslash and round brackets \\(e^{i\\pi} + 1 = 0\\)
                             }
                         }
                     }
-
+                }
                 RippleButton { // Send button
                     id: sendButton
-                    Layout.alignment: Qt.AlignTop
+                    Layout.alignment: Qt.AlignBottom
                     Layout.rightMargin: 5
                     implicitWidth: 40
                     implicitHeight: 40