fix: prevent teleported dropdown from overflowing viewport top

Amp-Thread-ID: https://ampcode.com/threads/T-019d2d64-af34-7489-abd5-cde23ead7105
Co-authored-by: Amp <amp@ampcode.com>

src/renderer/extensions/vueNodes/widgets/components/form/dropdown/FormDropdown.vue

@@ -178,6 +178,9 @@ function toggleDropdown() {
       spaceBelow < MENU_HEIGHT_WITH_GAP && spaceAbove > spaceBelow
 
     if (shouldTeleport) {
+      if (openUpward.value && rect.top < MENU_HEIGHT_WITH_GAP) {
+        openUpward.value = false
+      }
       fixedPosition.value = {
         top: openUpward.value ? rect.top : rect.bottom,
         left: Math.min(rect.right, window.innerWidth - MENU_WIDTH)