feat(ui): expose advanced popover positioning

Forward explicit anchors and position-method selection through PopoverContent so consumers can position popovers against virtual or custom anchors without bypassing the shared primitive.

packages/ui/src/components/popover.tsx

@@ -27,7 +27,13 @@ function PopoverTrigger({ ...props }: PopoverPrimitive.Trigger.Props) {
 type PopoverContentProps = PopoverPrimitive.Popup.Props &
   Pick<
     PopoverPrimitive.Positioner.Props,
-    "align" | "alignOffset" | "arrowPadding" | "side" | "sideOffset"
+    | "align"
+    | "alignOffset"
+    | "anchor"
+    | "arrowPadding"
+    | "positionMethod"
+    | "side"
+    | "sideOffset"
   > & {
     /**
      * Renders the popup with an AnchoredSurface and connects its tail to the
@@ -42,7 +48,9 @@ function PopoverContent({
   className,
   align = "center",
   alignOffset = 0,
+  anchor,
   arrowPadding,
+  positionMethod,
   render,
   showArrow = false,
   side = "bottom",
@@ -75,7 +83,9 @@ function PopoverContent({
       <PopoverPrimitive.Positioner
         align={align}
         alignOffset={alignOffset}
+        anchor={anchor}
         arrowPadding={resolvedArrowPadding}
+        positionMethod={positionMethod}
         side={side}
         sideOffset={resolvedSideOffset}
         className="isolate z-50"