Give Sound the whole story, and keep the buttons inside the card

Claude-Session: https://claude.ai/code/session_01Ms2FbjQy31TVf3CEvQhGM8

config/dot/quickshell/config/PreferenceSchema.qml

@@ -1487,6 +1487,24 @@ Singleton {
             detail: "Maximum notification banners shown at once"
         },
 
+        // ── Sound ───────────────────────────────────────────────────────────
+        // The two audio preferences that are Panama's own. Everything else on
+        // the Sound page is live PipeWire or a GNOME desktop key, and belongs
+        // to the system rather than to this file.
+        //
+        // Both are read by scripts/panama-osd as well as by the shell, so the
+        // volume keys behave the same whether the panel is open or not.
+        {
+            key: "overAmplification", type: "bool", def: false, group: "sound",
+            label: "Over-amplification",
+            detail: "Lets the volume slider go to 150% — louder, at the cost of distortion on some hardware"
+        },
+        {
+            key: "volumeChangeBlip", type: "bool", def: true, group: "sound",
+            label: "Volume-change blip",
+            detail: "A short click each time the volume keys move the output level"
+        },
+
         // ── Capture ─────────────────────────────────────────────────────────
         // Directories and encoder arguments are enums rather than free text:
         // both are handed to a recorder process, and an arbitrary string there

config/dot/quickshell/config/Settings.qml

@@ -83,6 +83,13 @@ Singleton {
     readonly property int notificationHistoryLimit: DesktopPreferences.get("notificationHistoryLimit")
     readonly property int maxVisibleToasts: DesktopPreferences.get("maxVisibleToasts")
 
+    // ── Sound ───────────────────────────────────────────────────────────────
+    // Over-amplification is the clamp ceiling for output volume: off means 1.0,
+    // on means 1.5. Every slider and the volume keys read the same switch, so
+    // the ceiling cannot differ depending on where you changed the volume from.
+    readonly property bool overAmplification: DesktopPreferences.get("overAmplification")
+    readonly property bool volumeChangeBlip: DesktopPreferences.get("volumeChangeBlip")
+
     // ── Focus ──────────────────────────────────────────────────────────────
     // One deliberate default rather than a preset picker: quick settings and
     // the keyboard shortcut should start a useful session in one action.