fix collisions

Author: Dingway98

src/context-providers/a11y-dom/index.ts

@@ -464,6 +464,10 @@ async function fetchIframeAXTrees(
         siblingPosition: 0, // TODO: Compute sibling position
         playwrightFrame, // Store Frame for frame resolution
       });
+
+      // Update nextFrameIndex to account for any nested frames we just merged
+      // This prevents frameIndex collisions when processing subsequent OOPIF frames
+      nextFrameIndex = Math.max(nextFrameIndex, ...Array.from(maps.frameMap?.keys() || [0])) + 1;
     } catch (error) {
       console.warn(
         `[A11y] Failed to fetch AX tree for OOPIF frame ${iframeFrameIndex} (url=${frameUrl}):`,