Add option to ignore app-requested notification timeout (#2909)

* Add option to ignore app-requested notification timeout

Notifications may include an expireTimeout hint that currently takes
precedence over the configured Low/Normal/Critical durations, so
popups can disappear earlier (or later) than expected with no
interaction involved. Add notificationIgnoreAppTimeout (default off,
matching the notification spec) to let users force their own
durations regardless of what the app requests.

* Update settings search index for new timeout override toggle

quickshell/Modules/Settings/NotificationsTab.qml

@@ -844,6 +844,15 @@ Item {
                         }
                     }
                 }
+
+                SettingsToggleRow {
+                    settingKey: "notificationIgnoreAppTimeout"
+                    tags: ["notification", "timeout", "expire", "app", "override", "duration"]
+                    text: I18n.tr("Ignore App-Requested Timeout")
+                    description: I18n.tr("Always use the durations above, even if an app requests a shorter or longer one")
+                    checked: SettingsData.notificationIgnoreAppTimeout
+                    onToggled: checked => SettingsData.set("notificationIgnoreAppTimeout", checked)
+                }
             }
 
             SettingsCard {