feat: option to auto-hide the bar with edge hover reveal

- Keep bar as overlay while auto-hide is enabled (WlrLayershell.exclusionMode: Ignore) to avoid compositor relayouts and work-area changes.

- Add 1px edge "peek" PanelWindow overlay to reveal on hover;

- Animate bar with directional slide.

Modules/Settings/Tabs/BarTab.qml

@@ -120,6 +120,14 @@ ColumnLayout {
     onToggled: checked => Settings.data.bar.floating = checked
   }
 
+  NToggle {
+    Layout.fillWidth: true
+    label: "Auto Hide" 
+    description: "Automatically hide the bar when not in use." 
+    checked: Settings.data.bar.autoHide
+    onToggled: checked => Settings.data.bar.autoHide = checked
+  }
+
   // Floating bar options - only show when floating is enabled
   ColumnLayout {
     visible: Settings.data.bar.floating