fix: window close hanging — replace onCloseRequested with auto-save

onCloseRequested async handler was permanently blocking window close
on Windows, even with the 2s timeout. The confirm() dialog and async
invoke chain prevented the close event from completing.

Fix: removed onCloseRequested entirely. Workspace now auto-saves
every 30 seconds via setInterval. Close button works immediately
with no handler blocking it.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/layouts/MainLayout.vue

@@ -510,30 +510,16 @@ onMounted(async () => {
     } catch {}
   }, 500);
 
-  // Confirm close + save workspace on window close
-  try {
-    const { getCurrentWindow } = await import("@tauri-apps/api/window");
-    const appWindow = getCurrentWindow();
-    appWindow.onCloseRequested(async (event) => {
-      // Ask for confirmation if there are active sessions
-      if (sessionStore.sessions.length > 0) {
-        if (!confirm("Are you sure you want to close Wraith?")) {
-          event.preventDefault();
-          return;
-        }
-      }
-      // Save workspace before closing (with timeout to prevent hang)
-      try {
+  // Auto-save workspace every 30 seconds instead of on close
+  // (onCloseRequested was hanging the window close on Windows)
+  setInterval(() => {
     const tabs = sessionStore.sessions
       .filter(s => s.protocol === "ssh" || s.protocol === "rdp")
       .map((s, i) => ({ connectionId: s.connectionId, protocol: s.protocol, position: i }));
-        await Promise.race([
-          invoke("save_workspace", { tabs }),
-          new Promise(resolve => setTimeout(resolve, 2000)),
-        ]);
-      } catch {}
-    });
-  } catch {}
+    if (tabs.length > 0) {
+      invoke("save_workspace", { tabs }).catch(() => {});
+    }
+  }, 30000);
 
   // Check for updates on startup via Tauri updater plugin (non-blocking)
   invoke<{ currentVersion: string; latestVersion: string; updateAvailable: boolean; downloadUrl: string }>("check_for_updates")