Fix the Show keys toggle: flip the real paused state

ToggleSwitch does not flip checked on click — it only emits toggled()
and the caller owns the value. Reading !checked there yielded the
current bound state, so setPaused's guard always early-returned and the
toggle never did anything. Flip !root.paused instead; the checked
binding follows the flag file.

Panel.qml

@@ -153,7 +153,10 @@ Panel {
           checked: !root.paused
           foreground: Color.popups.text
           accent: Color.accent
-          onToggled: root.setPaused(!checked)
+          // ToggleSwitch does not flip `checked` itself — it only emits
+          // toggled() and the caller owns the value. Flip the real state;
+          // the checked binding follows.
+          onToggled: root.setPaused(!root.paused)
         }
       }