feat: add confirmation prompt before closing active session tabs (#793)

Shows a toast confirmation when closing terminal, RDP, VNC or telnet
tabs to prevent accidental session loss from misclicks.

src/ui/AppShell.tsx

@@ -383,7 +383,9 @@ export function AppShell({
     setActiveTabId(id);
   }
 
-  function closeTab(id: string) {
+  const SESSION_TAB_TYPES: TabType[] = ["terminal", "rdp", "vnc", "telnet"];
+
+  function doCloseTab(id: string) {
     terminalRefs.current.delete(id);
     setTabs((prev) => {
       const next = prev.filter((t) => t.id !== id);
@@ -392,6 +394,25 @@ export function AppShell({
     });
   }
 
+  function closeTab(id: string) {
+    const tab = tabs.find((t) => t.id === id);
+    if (tab && SESSION_TAB_TYPES.includes(tab.type)) {
+      toast(t("nav.confirmClose"), {
+        duration: 5000,
+        action: {
+          label: t("nav.close"),
+          onClick: () => doCloseTab(id),
+        },
+        cancel: {
+          label: t("nav.cancel"),
+          onClick: () => {},
+        },
+      });
+      return;
+    }
+    doCloseTab(id);
+  }
+
   // ─── Rail / sidebar ──────────────────────────────────────────────────────
 
   function handleRailClick(view: RailView) {