feat: configurable volume amount on scroll for Media widget (#1641)

* Add audioWheelScrollAmount setting

* Add UI to configure volume change amount for Media Player widget

* Let Media Player widget use the configured volume change on wheel event

quickshell/Common/SettingsData.qml

@@ -270,6 +270,7 @@ Singleton {
     property bool scrollTitleEnabled: true
     property bool audioVisualizerEnabled: true
     property string audioScrollMode: "volume"
+    property int audioWheelScrollAmount: 5
     property bool clockCompactMode: false
     property bool focusedWindowCompactMode: false
     property bool runningAppsCompactMode: true

quickshell/Common/settings/SettingsSpec.js

@@ -125,6 +125,7 @@ var SPEC = {
     scrollTitleEnabled: { def: true },
     audioVisualizerEnabled: { def: true },
     audioScrollMode: { def: "volume" },
+    audioWheelScrollAmount: { def: 5 },
     clockCompactMode: { def: false },
     focusedWindowCompactMode: { def: false },
     runningAppsCompactMode: { def: true },