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/Widgets/DankPopout.qml

@@ -145,6 +145,25 @@ Item {
         shouldBeVisible ? close() : open();
     }
 
+    Connections {
+        target: Quickshell
+        function onScreensChanged() {
+            if (!shouldBeVisible || !screen)
+                return;
+            const currentScreenName = screen.name;
+            let screenStillExists = false;
+            for (let i = 0; i < Quickshell.screens.length; i++) {
+                if (Quickshell.screens[i].name === currentScreenName) {
+                    screenStillExists = true;
+                    break;
+                }
+            }
+            if (!screenStillExists) {
+                close();
+            }
+        }
+    }
+
     Timer {
         id: closeTimer
         interval: animationDuration