Detect the Chinese finish screen by its title in the harness

bin/omarchy-iso-test

@@ -828,7 +828,8 @@ wait_for_install() {
   while true; do
     text=$(ocr_screen)
 
-    if grep -qi "$(region_text "Reboot Now" "立即重启")" <<<"$text"; then
+    # OCR cannot read the Chinese reboot button, so China matches the title above it.
+    if grep -qi "$(region_text "Reboot Now" "安装完成")" <<<"$text"; then
       log "Install finished. Confirming the reboot prompt."
       capture_console "success-installer-15-reboot"
       press ret