fix(review): address PR #105 review follow-ups

- src/log.c: log_stderr_init no longer closes STDERR_FILENO immediately
  after dup2(). The previous 'close(dup_fd)' closed fd 2 because dup2
  returns newfd on success; the in-app stderr capture pipe was silently
  dead, dropping libstrophe/openssl error output. Close the original
  stderr_pipe[1] instead and remember that the write end now lives at
  STDERR_FILENO so _log_stderr_close stays correct.

- src/database_sqlite.c: NULL-check sqlite3_mprintf result before
  passing it to sqlite3_exec in the DbVersion bootstrap path.

- src/tools/editor.c: drop three orphan #includes (<fcntl.h>,
  <pthread.h>, <readline/readline.h>) left behind when 9b03e3a50
  removed the async-editor path.

- src/xmpp/jid.c: match the g_new0 allocation in jid_create with
  g_free in jid_destroy. Same behaviour on glibc but stops being a
  foot-gun under custom glib allocators.

Verified with ci-build.sh in Debian docker: all 4 configs pass
(644/0, 605/0, 605/0, 644/0 unit + 130/0 functional).

src/database_sqlite.c

@@ -232,6 +232,10 @@ _sqlite_init(ProfAccount* account)
         auto_sqlite char* init_version_query = sqlite3_mprintf(
             "INSERT INTO `DbVersion` (`version`) VALUES (%d) ON CONFLICT(`version`) DO NOTHING",
             latest_version);
+        if (!init_version_query) {
+            log_error("OOM allocating initial DbVersion insert query");
+            goto out;
+        }
         if (SQLITE_OK != sqlite3_exec(g_chatlog_database, init_version_query, NULL, 0, &err_msg)) {
             goto out;
         }

src/log.c

@@ -348,10 +348,11 @@ log_stderr_init(log_level_t level)
         goto err_free;
     }
 
-    int dup_fd = dup2(stderr_pipe[1], STDERR_FILENO);
-    if (dup_fd < 0)
+    if (dup2(stderr_pipe[1], STDERR_FILENO) < 0)
         goto err_free;
-    close(dup_fd);
+    // fd 2 now owns the pipe write end; release the original.
+    close(stderr_pipe[1]);
+    stderr_pipe[1] = STDERR_FILENO;
 
     stderr_level = level;
     stderr_inited = 1;

src/tools/editor.c

@@ -9,14 +9,11 @@
  * SPDX-License-Identifier: GPL-3.0-or-later WITH OpenSSL-exception
  */
 
-#include <fcntl.h>
 #include <glib.h>
 #include <errno.h>
-#include <stdio.h> // necessary for readline
-#include <readline/readline.h>
+#include <stdio.h>
 #include <sys/wait.h>
 #include <unistd.h>
-#include <pthread.h>
 #include <signal.h>
 
 #include "config/files.h"

src/xmpp/jid.c

@@ -217,7 +217,7 @@ jid_destroy(Jid* jid)
     g_free(jid->resourcepart);
     g_free(jid->barejid);
     g_free(jid->fulljid);
-    free(jid);
+    g_free(jid);
 }
 
 gboolean