fix(nosignal): hardware-test round 3 — notif Clear + Game Mode → DeckShift

F2: NsNotifications.qml "Clear" mirrors the service (Notifs.list.slice() →
n.close()) instead of n.notification?.dismiss() — cards now actually leave the
list, and it works for disk-restored notifications (whose notification is null).

C2: Toggles.qml gameMode delegate launches the guarded switch-to-gaming via
Quickshell.execDetached (debounced + disabled + 5s timer so a double-click can't
fire two SDDM restarts), and the tile is hidden entirely when DeckShift isn't
installed (Process probe for the gamescope session file).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

modules/nsbar/panels/NsNotifications.qml

@@ -71,8 +71,16 @@ NsPanel {
                 hoverEnabled: true
                 cursorShape: Qt.PointingHandCursor
                 onClicked: {
-                    for (const n of Notifs.notClosed)
+                    // Mirror the service's own clear() / clearNotifs shortcut:
-                        n.notification?.dismiss();
+                    // NotifData.close() sets `closed` (drops it from notClosed so the
+                    // card disappears), removes it from Notifs.list, dismisses the
+                    // server notification and destroys it. Calling
+                    // `notification?.dismiss()` directly cleared nothing — it never
+                    // touched the list, and is a no-op for notifications restored from
+                    // disk (their `notification` is null). Iterate a slice() copy so
+                    // mutating the list mid-loop is safe.
+                    for (const n of Notifs.list.slice())
+                        n.close();
                 }
             }
         }

modules/utilities/cards/Toggles.qml

@@ -2,6 +2,8 @@ pragma ComponentBehavior: Bound
 
 import QtQuick
 import QtQuick.Layouts
+import Quickshell
+import Quickshell.Io
 import Quickshell.Bluetooth
 import Caelestia.Components
 import Caelestia.Config
@@ -17,6 +19,18 @@ StyledRect {
     required property DrawerVisibilities visibilities
     required property BarPopouts.Wrapper popouts
 
+    // NoSignal: the gamepad "Game Mode" toggle launches DeckShift gaming. Hide it
+    // entirely when DeckShift isn't installed (no gamescope session file) — checked
+    // once at load by deckshiftProbe below.
+    property bool deckshiftInstalled: false
+
+    Process {
+        id: deckshiftProbe
+        running: true
+        command: ["test", "-f", "/usr/share/wayland-sessions/gamescope-session-steam-nm.desktop"]
+        onExited: (exitCode, exitStatus) => root.deckshiftInstalled = exitCode === 0
+    }
+
     readonly property var quickToggles: {
         const seenIds = new Set();
 
@@ -32,6 +46,11 @@ StyledRect {
                 return GlobalConfig.utilities.vpn.provider.some(p => typeof p === "object" ? (p.enabled === true) : false);
             }
 
+            // NoSignal: drop the Game Mode tile unless DeckShift is installed.
+            if (item.id === "gameMode") {
+                return root.deckshiftInstalled;
+            }
+
             seenIds.add(item.id);
             return true;
         });
@@ -126,9 +145,33 @@ StyledRect {
                 DelegateChoice {
                     roleValue: "gameMode"
                     delegate: Toggle {
+                        id: gmTog
+                        // NoSignal: launch the DeckShift gaming session if installed;
+                        // otherwise do nothing. (Was caelestia's cosmetic Game Mode.)
+                        // Kept styled as an off-toggle (muted, outline icon) — the
+                        // gamepad is a momentary LAUNCHER, not a stateful toggle.
+                        // DEBOUNCED: a fast double-click must not fire two
+                        // `switch-to-gaming` runs — two SDDM restarts race the
+                        // one-shot autologin and drop you at the password greeter.
+                        // Guard mirrors the Super+Shift+S bind + the deckshift-login
+                        // install-check, so it no-ops if DeckShift is absent.
+                        property bool launching: false
                         icon: "gamepad"
-                        checked: GameMode.enabled
+                        disabled: launching
-                        onClicked: GameMode.enabled = !GameMode.enabled
+                        onClicked: {
+                            if (gmTog.launching)
+                                return;
+                            gmTog.launching = true;
+                            gmTog.internalChecked = false; // don't latch "on"
+                            relockTimer.start();
+                            Quickshell.execDetached(["sh", "-c", "[ -x /usr/local/bin/switch-to-gaming ] && [ -f /usr/share/wayland-sessions/gamescope-session-steam-nm.desktop ] && exec /usr/local/bin/switch-to-gaming"]);
+                        }
+
+                        Timer {
+                            id: relockTimer
+                            interval: 5000
+                            onTriggered: gmTog.launching = false
+                        }
                     }
                 }
                 DelegateChoice {