fix: workspace restore crash — defer to setTimeout, wrap all imports

Workspace restore was running synchronously in onMounted which could
crash if saved connection IDs were stale. The import of
@tauri-apps/api/window for onCloseRequested could also fail in
certain contexts.

Fix: defer restore to setTimeout(500ms) so the app renders first,
wrap each reconnect in individual try/catch, wrap the window close
listener setup in try/catch.

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

src/layouts/MainLayout.vue

@@ -438,24 +438,29 @@ onMounted(async () => {
   document.addEventListener("keydown", handleKeydown);
   await connectionStore.loadAll();
 
-  // Restore workspace — reconnect saved tabs
+  // Restore workspace — reconnect saved tabs (non-blocking, non-fatal)
+  setTimeout(async () => {
     try {
       const workspace = await invoke<{ tabs: { connectionId: number; protocol: string; position: number }[] } | null>("load_workspace");
       if (workspace?.tabs?.length) {
         for (const tab of workspace.tabs.sort((a, b) => a.position - b.position)) {
-        sessionStore.connect(tab.connectionId).catch(() => {});
+          try { await sessionStore.connect(tab.connectionId); } catch {}
         }
       }
     } catch {}
+  }, 500);
 
-  // Save workspace on window close
-  const appWindow = await import("@tauri-apps/api/window").then(m => m.getCurrentWindow());
+  // Save workspace on window close (non-fatal)
+  try {
+    const { getCurrentWindow } = await import("@tauri-apps/api/window");
+    const appWindow = getCurrentWindow();
     appWindow.onCloseRequested(async () => {
       const tabs = sessionStore.sessions
         .filter(s => s.protocol === "ssh" || s.protocol === "rdp")
         .map((s, i) => ({ connectionId: s.connectionId, protocol: s.protocol, position: i }));
       await invoke("save_workspace", { tabs }).catch(() => {});
     });
+  } catch {}
 
   // Check for updates on startup (non-blocking)
   invoke<{ currentVersion: string; latestVersion: string; updateAvailable: boolean; downloadUrl: string }>("check_for_updates")