refactor(ui): One QML file per screen; the HDMI boost's setup screens and backend commands removed

ui/qml/DoneScreen.qml

@@ -0,0 +1,28 @@
+// The result of a run: all done, a problem, or nothing changed.
+import QtQuick
+
+Item {
+    required property AppState app
+    readonly property bool problem: app.failed.length > 0 || app.runError !== ""
+    readonly property string message: {
+        if (app.runError) return app.runError;
+        if (!app.biosRun) return app.plan.length + (app.plan.length === 1 ? " change" : " changes") + " applied." + (app.restartNeeded ? " Some take effect after a restart." : "");
+        if (app.failed.length) return "The BIOS was not changed.";
+        return (app.bios && app.bios.dryRun ? "Dry run: nothing was flashed. " : "BIOS " + (app.biosInfo.newest || "") + " is staged and is written during the restart. ")
+             + "Keep the power on and don't touch the machine until it has fully started again, even if the screen stays black.";
+    }
+    Column {
+        anchors.centerIn: parent; width: 760; spacing: 20
+        Rectangle { width: 72; height: 72; radius: 36; anchors.horizontalCenter: parent.horizontalCenter; color: problem ? Theme.warnBg : Theme.goodBg
+            Text { anchors.centerIn: parent; text: problem ? "!" : "✓"; color: problem ? Theme.warn : Theme.good; font.pixelSize: 36; font.weight: Font.Bold } }
+        Text { text: app.runError ? "Nothing changed" : (app.biosRun && app.failed.length ? "The BIOS update stopped" : (app.failed.length ? "Done, with a problem" : "All done"))
+               color: Theme.text; font.family: Theme.display; font.pixelSize: 40; font.weight: Font.DemiBold; anchors.horizontalCenter: parent.horizontalCenter }
+        Text { width: parent.width; horizontalAlignment: Text.AlignHCenter; wrapMode: Text.WordWrap; color: Theme.soft; font.family: Theme.body; font.pixelSize: 17; text: message }
+        Rectangle { visible: app.failed.length > 0; anchors.horizontalCenter: parent.horizontalCenter; width: ft.implicitWidth + 32; height: 44; radius: 12; color: Theme.warnBg
+            Text { id: ft; anchors.centerIn: parent; color: "#f2c27a"; font.family: Theme.body; font.pixelSize: 14
+                   text: "Had a problem: " + app.failed.map(function (id) { return Texts.label(id); }).join(", ") + ". See the details." } }
+        Row { anchors.horizontalCenter: parent.horizontalCenter; spacing: 14; topPadding: 8
+            Btn { k: Input.g.back; text: "Back to the menu"; height: 52; onClicked: app.act("back") }
+            Btn { visible: app.restartNeeded; k: Input.g.ok; text: "Restart now"; primary: true; height: 52; onClicked: app.backend.restart() } }
+    }
+}