tray: add automatic overflow popup (#2629)

quickshell/Common/SettingsData.qml

@@ -405,6 +405,9 @@ Singleton {
     property int barMaxVisibleApps: 0
     property int barMaxVisibleRunningApps: 0
     property bool barShowOverflowBadge: true
+    property bool trayAutoOverflow: true
+    property bool trayPopupSingleLine: true
+    property int trayMaxVisibleItems: 0
     property bool appsDockHideIndicators: false
     property bool appsDockColorizeActive: false
     property string appsDockActiveColorMode: "primary"

quickshell/Common/settings/SettingsSpec.js

@@ -164,6 +164,9 @@ var SPEC = {
     barMaxVisibleApps: { def: 0 },
     barMaxVisibleRunningApps: { def: 0 },
     barShowOverflowBadge: { def: true },
+    trayAutoOverflow: { def: true },
+    trayPopupSingleLine: { def: true },
+    trayMaxVisibleItems: { def: 0 },
     appsDockHideIndicators: { def: false },
     appsDockColorizeActive: { def: false },
     appsDockActiveColorMode: { def: "primary" },