refactor(tests): migrate to content-based stubbing

- Replace stbbr_for_id() with stbbr_for_query()/stbbr_send()
- Content-based stubbing matches stanzas by namespace instead of ID
- Use regex assertions for flexible output matching
- Fix timing issues in chat_session and presence tests

tests/functionaltests/test_connect.c

@@ -2,9 +2,9 @@
 #include "prof_cmocka.h"
 #include <stdlib.h>
 #include <string.h>
+#include <stdio.h>
 
 #include <stabber.h>
-#include <expect.h>
 
 #include "proftest.h"
 
@@ -47,7 +47,9 @@ connect_jid_requests_bookmarks(void **state)
 void
 connect_bad_password(void **state)
 {
-    prof_input("/connect stabber@localhost server 127.0.0.1 port 5230 tls allow");
+    char connect_cmd[128];
+    snprintf(connect_cmd, sizeof(connect_cmd), "/connect stabber@localhost server 127.0.0.1 port %d tls allow", stub_port);
+    prof_input(connect_cmd);
     prof_input("badpassword");
 
     assert_true(prof_output_exact("Login failed."));