Default the region to Global so deferring before choosing still installs

configs/airootfs/root/configurator

@@ -1039,6 +1039,7 @@ select_installation() {
 
 defer_provisioning=false
 install_target="full_disk"
+region="global"
 
 # Let the live VT reach its settled width before the first screen so the logo
 # isn't measured against the transient 80-column boot console.

test/unit/test_region.py

@@ -2,6 +2,8 @@
 
 import json
 import os
+import re
+import subprocess
 import sys
 import tempfile
 import types
@@ -72,6 +74,40 @@ class RegionTest(unittest.TestCase):
                 chroot = next(call.args[0] for call in run.call_args_list if call.args[0][0] == "arch-chroot")
                 self.assertIn(f"OMARCHY_REGION={region}", chroot)
 
+    def run_keyboard_form(self, script: str) -> str:
+        configurator = (ROOT / "configs/airootfs/root/configurator").read_text()
+        form = re.search(r"^keyboard_form\(\) \{\n.*?^\}", configurator, re.M | re.S)
+        init = re.search(r'^region="global"$', configurator, re.M)
+        self.assertIsNotNone(form)
+        self.assertIsNotNone(init)
+        harness = "\n".join([
+            "set -euo pipefail",
+            "OMARCHY_FORM_BACK=1; OMARCHY_FORM_SIGNAL=130; defer_provisioning=false",
+            "clear_logo() { :; }; say() { :; }; abort() { exit 99; }; tty() { echo /dev/pts/0; }",
+            "answers=(" + script + "); step=0",
+            "answer() { local a=${answers[step]}; step=$((step + 1)); [[ $a == ok:* ]] && eval \"${a#ok:}\" && return 0; return ${a#rc:}; }",
+            "omarchy_prompt_region() { echo \"region-preselect=$region\"; answer; }",
+            "omarchy_prompt_keyboard() { answer; }",
+            "confirm_prepare_for_another_owner() { answer; }",
+            init.group(),
+            form.group(),
+            "keyboard_form",
+            'echo "region=$region defer=$defer_provisioning"',
+        ])
+        return subprocess.run(["bash", "-c", harness], check=True, capture_output=True, text=True).stdout
+
+    def test_ctrl_c_before_choosing_defers_as_global(self):
+        out = self.run_keyboard_form("rc:130 ok:true")
+        self.assertIn("region=global defer=true", out)
+
+    def test_back_from_keyboard_keeps_the_chosen_region(self):
+        out = self.run_keyboard_form("ok:region=china rc:1 ok:true ok:keyboard=us")
+        self.assertEqual([line for line in out.splitlines() if line], [
+            "region-preselect=global",
+            "region-preselect=china",
+            "region=china defer=false",
+        ])
+
 
 if __name__ == "__main__":
     unittest.main()