gui: add submit button to prompt input

Add a ▶ button next to the text area for mouse-based submission.
Extract shared doSubmit() on the input RowLayout. Button uses
focusPolicy: Qt.NoFocus so it doesn't steal focus from the TextArea.

kde/gui/ChatPane.qml

@@ -203,10 +203,18 @@ Item {
 
             // Input
             RowLayout {
+                id: inputRow
                 Layout.fillWidth: true
                 Layout.margins: 6
                 spacing: 4
 
+                function doSubmit() {
+                    if (promptInput.text.trim() !== "") {
+                        ollie.submit(promptInput.text.trim())
+                        promptInput.text = ""
+                    }
+                }
+
                 // TextArea in ScrollView for overflow, with context menu overlay
                 Item {
                     Layout.fillWidth: true
@@ -246,10 +254,7 @@ Item {
                                 if (event.modifiers & Qt.ShiftModifier) {
                                     event.accepted = false
                                 } else {
-                                    if (text.trim() !== "") {
+                                    inputRow.doSubmit()
-                                        ollie.submit(text.trim())
-                                        text = ""
-                                    }
                                     event.accepted = true
                                 }
                             }
@@ -285,6 +290,19 @@ Item {
                         }
                     }
                 }
+
+                Button {
+                    text: "▶"
+                    Layout.alignment: Qt.AlignBottom
+                    Layout.preferredWidth: 36
+                    Layout.preferredHeight: 36
+                    focusPolicy: Qt.NoFocus
+                    enabled: promptInput.enabled && promptInput.text.trim() !== ""
+                    onClicked: inputRow.doSubmit()
+
+                    ToolTip.visible: hovered
+                    ToolTip.text: "Send (Enter)"
+                }
             }
         }