chore(release): bump version to 0.2.140+154

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

Author: bennytsai1234

pubspec.yaml

@@ -1,7 +1,7 @@
 name: night_reader
 description: "夜讀 - Night Reader, a Flutter novel reader app"
 publish_to: 'none'
-version: 0.2.139+153
+version: 0.2.140+154
 homepage: https://github.com/bennytsai1234/night-reader
 repository: https://github.com/bennytsai1234/night-reader
 issue_tracker: https://github.com/bennytsai1234/night-reader/issues