fix: VpnPopout and Vpn widget tooltip positions (#1623)

* fix(vpn-widget): correct tooltip positioning for bottom bar alignment

- Calculate tooltip Y position based on bar edge (bottom vs top)
- Position tooltip above bar when edge is bottom to prevent overflow
- Account for tooltip height when positioning on bottom edge
- Use proper screen reference for consistent positioning across displays

* fix(VpnPopout): use correct screen height for popup sizing

- Fix popup height calculation to use the assigned screen property
  instead of the global Screen object
- Prevents incorrect positioning when multiple screens are present
- Fallback to Screen.height if screen property is not set

* fix(widgets): close DankPopout when screen is removed

- Add Connections handler to monitor Quickshell.onScreensChanged
- Automatically close popout if its assigned screen no longer exists
- Prevent orphaned popouts when displays are disconnected

quickshell/Modules/DankBar/Popouts/VpnPopout.qml

@@ -17,7 +17,7 @@ DankPopout {
     property var triggerScreen: null
 
     popupWidth: 380
-    popupHeight: Math.min(Screen.height - 100, contentLoader.item ? contentLoader.item.implicitHeight : 320)
+    popupHeight: Math.min((screen ? screen.height : Screen.height) - 100, contentLoader.item ? contentLoader.item.implicitHeight : 320)
     triggerWidth: 70
     screen: triggerScreen
     shouldBeVisible: false