v2.3.2: fix HelpView showing blank window (regression in v2.3.1)

In v2.3.1 the new 'Re-run Onboarding' button was added but the
self.setLayout(main_layout) line was accidentally indented into the
new _reopen_onboarding method body, so init_ui returned without
applying the layout. Result: F1 opened an empty dialog with no tabs.

Move setLayout back to the end of init_ui.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

core/version.py

@@ -4,4 +4,4 @@
 릴리스 시 이 값을 올린 후 git tag → push.
 CHANGELOG.md의 최상단 항목과 일치시킬 것.
 """
-__version__ = '2.3.1'
+__version__ = '2.3.2'