fix: use desktop codex for dashboard runs

Tools/Dashboard/serve.py

@@ -621,6 +621,29 @@ def _codex_job_snapshot(job):
 
 
 def _codex_command_base():
+    override = os.environ.get('TH1_DASHBOARD_CODEX_EXE', '').strip()
+    if override and os.path.isfile(override):
+        return [override]
+
+    if sys.platform == 'win32':
+        local_appdata = os.environ.get('LOCALAPPDATA') or os.path.join(os.path.expanduser('~'), 'AppData', 'Local')
+        desktop_bin = os.path.join(local_appdata, 'OpenAI', 'Codex', 'bin')
+        candidates = []
+        try:
+            for name in os.listdir(desktop_bin):
+                exe_path = os.path.join(desktop_bin, name, 'codex.exe')
+                if os.path.isfile(exe_path):
+                    try:
+                        mtime = os.path.getmtime(exe_path)
+                    except Exception:
+                        mtime = 0
+                    candidates.append((mtime, exe_path))
+        except Exception:
+            candidates = []
+        if candidates:
+            candidates.sort(reverse=True)
+            return [candidates[0][1]]
+
     if sys.platform == 'win32':
         for name in ('codex.cmd', 'codex.exe', 'codex.bat'):
             found = shutil.which(name)
@@ -4873,18 +4896,23 @@ def kill_stale_servers(port):
             pass
 
 
-os.chdir(SCRIPT_DIR)
+def main():
+    os.chdir(SCRIPT_DIR)
 
-print(f'Checking port {PORT} for stale processes...')
-kill_stale_servers(PORT)
+    print(f'Checking port {PORT} for stale processes...')
+    kill_stale_servers(PORT)
 
-with http.server.ThreadingHTTPServer(('', PORT), DashboardHandler) as httpd:
-    url = f'http://localhost:{PORT}'
-    print(f'TH1 Dashboard serving at {url}')
-    print('Press Ctrl+C to stop.')
-    if os.environ.get('TH1_DASHBOARD_NO_BROWSER') != '1':
-        webbrowser.open(url)
-    try:
-        httpd.serve_forever()
-    except KeyboardInterrupt:
-        print('\nStopped.')
+    with http.server.ThreadingHTTPServer(('', PORT), DashboardHandler) as httpd:
+        url = f'http://localhost:{PORT}'
+        print(f'TH1 Dashboard serving at {url}')
+        print('Press Ctrl+C to stop.')
+        if os.environ.get('TH1_DASHBOARD_NO_BROWSER') != '1':
+            webbrowser.open(url)
+        try:
+            httpd.serve_forever()
+        except KeyboardInterrupt:
+            print('\nStopped.')
+
+
+if __name__ == '__main__':
+    main()