del: windowMode$ from public callViewModel

replace with edgeToEdge$

src/components/CallFooterViewModel.test.ts

@@ -37,7 +37,7 @@ vi.mock("@livekit/track-processors", () => ({
 function buildMinimalCallViewModel(layout: Layout): CallViewModel {
   return {
     layout$: constant(layout),
-    windowMode$: constant("normal"),
+    edgeToEdge$: constant(false),
     showHeader$: constant(false),
     hangup: (): void => {},
     gridMode$: constant("grid"),

src/components/CallFooterViewModel.tsx

@@ -154,9 +154,7 @@ export function createCallFooterViewModel(
     // candidat to move into the FooterViewModel
     showFooter$: callModel.showFooter$,
     hideControls$: constant(!showControls),
-    asOverlay$: scope.behavior(
-      callModel.windowMode$.pipe(map((mode) => mode === "flat")),
-    ),
+    asOverlay$: callModel.edgeToEdge$,
     buttonSize$: scope.behavior(
       isPip$.pipe(map<boolean, "md" | "lg">((pip) => (pip ? "md" : "lg"))),
     ),