dankbar: support multiple bars and per-display bars

- Migrate settings to v2
  - Up to 4 bars
  - Per-bar settings instead of global

quickshell/Widgets/DankToggle.qml

@@ -28,9 +28,8 @@ Item {
 
     function handleClick() {
         if (!enabled) return
-        checked = !checked
         clicked()
-        toggled(checked)
+        toggled(!checked)
     }
 
     StyledRect {