推进 INI 面板 launch mount-state DOM 渲染

wasm-port/tests/browser/ini_panel_launch_smoke.html

@@ -487,6 +487,36 @@
         "none",
         "shell session handoff DOM blocking reasons",
       );
+      assertEqual(
+        launchDoc.querySelector("[data-handoff-mount-status]").textContent,
+        "Blocked: session-load-state",
+        "shell session handoff mount DOM status",
+      );
+      assertEqual(
+        launchDoc.querySelector("[data-handoff-mount]").dataset.handoffPhase,
+        "blocked",
+        "shell session handoff mount DOM phase",
+      );
+      assertEqual(
+        launchDoc.querySelector("[data-handoff-mount]").dataset.handoffReady,
+        "false",
+        "shell session handoff mount DOM ready",
+      );
+      assertEqual(
+        launchDoc.querySelector("[data-handoff-mount]").dataset.handoffScope,
+        "mount",
+        "shell session handoff mount DOM scope",
+      );
+      assertEqual(
+        launchDoc.querySelector('[data-handoff-mount-value="session-load-state"]').textContent,
+        "waiting-panel",
+        "shell session handoff mount DOM session state",
+      );
+      assertEqual(
+        launchDoc.querySelector('[data-handoff-mount-value="session-load-state"]').dataset.handoffMountStatus,
+        "blocked",
+        "shell session handoff mount DOM session status",
+      );
       assertEqual(
         shellSessionHandoffSummary.targetPage.href,
         "./control-page.html",