fix: people list crash + call embed positioning + debug logging

- millify.ts: use named import { millify as millifyPlugin } instead of
  default import to fix Rolldown CJS interop bug where zc.default gets
  set to the whole module object instead of the function (mode=1 forces
  default=n instead of default=n.default, breaking MembersDrawer)
- useCallEmbed.ts: use getBoundingClientRect() for accurate fixed
  positioning; add useEffect to trigger syncCallEmbedPlacement on mount
  so embed is positioned before the first resize event
- CallEmbedProvider.tsx: fix [pipMode, callVisible] effect to NOT clear
  top/left/width/height when callVisible changes (previously cleared
  position set by syncCallEmbedPlacement every time joined changed);
  only clear pip-specific styles when actually exiting pip; add debug
  console logging for positioning state

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/app/hooks/useCallEmbed.ts

@@ -154,12 +154,21 @@ export const useCallEmbedPlacementSync = (containerViewRef: RefObject<HTMLDivEle
     const container = containerViewRef.current;
     if (!embedEl || !container) return;
 
-    embedEl.style.top = `${container.offsetTop}px`;
-    embedEl.style.left = `${container.offsetLeft}px`;
-    embedEl.style.width = `${container.clientWidth}px`;
-    embedEl.style.height = `${container.clientHeight}px`;
+    const rect = container.getBoundingClientRect();
+    console.log('[CallEmbed] syncCallEmbedPlacement:', {
+      top: rect.top, left: rect.left, width: rect.width, height: rect.height,
+    });
+    embedEl.style.top = `${rect.top}px`;
+    embedEl.style.left = `${rect.left}px`;
+    embedEl.style.width = `${rect.width}px`;
+    embedEl.style.height = `${rect.height}px`;
   }, [callEmbedRef, containerViewRef]);
 
+  // Sync once on mount so the embed is positioned immediately (deps are stable refs)
+  useEffect(() => {
+    syncCallEmbedPlacement();
+  }, [syncCallEmbedPlacement]);
+
   useResizeObserver(
     syncCallEmbedPlacement,
     useCallback(() => containerViewRef.current, [containerViewRef]),