feat: add v2 task control and asynchronous isolated workers

app/qml/Composer.qml

@@ -22,7 +22,7 @@ Rectangle {
 
     function submit() {
         const t = input.text.trim()
-        if (!t.length || running)
+        if (!t.length)
             return
         input.text = ""
         submitted(t)
@@ -142,7 +142,7 @@ Rectangle {
                 Layout.preferredHeight: Math.min(root.compact ? 120 : 170,
                                                  Math.max(56, contentHeight + 12))
                 placeholderText: root.running
-                                 ? "the turn is running — Esc stops it"
+                                 ? "Send a correction now — Esc pauses execution"
                                  : (root.compact
                                     ? "Ask for something…"
                                     : "Ask for something (Enter sends, Shift+Enter for a new line)")
@@ -155,7 +155,7 @@ Rectangle {
                 inputMethodHints: Qt.ImhMultiLine | Qt.ImhNoPredictiveText |
                                   Qt.ImhNoAutoUppercase
                 background: Rectangle { color: "transparent" }
-                enabled: !root.running
+                enabled: true
 
                 Keys.onPressed: function (ev) {
                     if (ev.key === Qt.Key_Return || ev.key === Qt.Key_Enter) {
@@ -206,9 +206,9 @@ Rectangle {
                 Layout.alignment: Qt.AlignBottom
                 implicitWidth: root.compact ? 68 : 88
                 implicitHeight: Theme.touchTarget + 4
-                text: root.running ? "Stop" : "Send"
+                text: root.running ? (input.text.trim().length ? "Redirect" : "Stop") : "Send"
                 enabled: root.running || input.text.trim().length > 0
-                onClicked: root.running ? agent.cancel() : root.submit()
+                onClicked: root.running && !input.text.trim().length ? agent.cancel() : root.submit()
                 background: Rectangle {
                     radius: Theme.radiusSm
                     color: !action.enabled ? Theme.surfaceAlt