fix(ui): allow trigger-anchored dropdowns on mobile

packages/ui/components/Dropdown.wrn

@@ -17,6 +17,7 @@ items: unknown[] = []
     showChevron: boolean = true
     menuLabel: string = "Dropdown menu"
     placement: string = "bottom-start"
+    mobilePanel: string = "sheet"
     width: string = "md"
     size: string = "default"
     color: string = "primary"
@@ -151,6 +152,7 @@ items: unknown[] = []
       data-ui-component="Dropdown"
       data-open='{open || visible ? "true" : "false"}'
       data-placement='{placement}'
+      data-mobile-panel='{mobilePanel}'
       data-width='{width}'
       data-size='{size}'
       data-color='{color}'
@@ -572,7 +574,7 @@ items: unknown[] = []
     }
 
     @media (max-width: 639px) {
-      .wrn-dropdown[data-placement] .wrn-dropdown__panel {
+      .wrn-dropdown[data-placement][data-mobile-panel="sheet"] .wrn-dropdown__panel {
         position: fixed;
         right: 0.75rem;
         bottom: 0.75rem;