tui: added ctrl-z terminal suspension support (#3983)

packages/opencode/src/cli/cmd/tui/app.tsx

@@ -342,6 +342,21 @@ function App() {
         dialog.clear()
       },
     },
+    {
+      title: "Suspend terminal",
+      value: "terminal.suspend",
+      keybind: "terminal_suspend",
+      category: "System",
+      onSelect: () => {
+        process.once("SIGCONT", () => {
+          renderer.resume()
+        })
+
+        renderer.suspend()
+        // pid=0 means send the signal to all processes in the process group
+        process.kill(0, "SIGTSTP")
+      },
+    },
   ])
 
   createEffect(() => {