[regeloapp-coder]

Summary

• Move the signed-in user's works/drafts and create-book action from Profile to the Write tab.
• Group book import, series, editing, preview, world-building, stats, export, and deletion actions in the Write screen.
• Keep profile editing, account/privacy settings, and social/profile actions in Profile.
• Add a navigation regression test for preserving the Write tab's editor back stack and bump to v1.3.4 (versionCode 134).

Validation

• Focused NavigatorTest was added.
• git diff --check passed.
• Android build/tests and APK artifact are pending GitHub Actions; local Java is unavailable.

Release

After CI passes, merge and create the v1.3.4 GitHub test release with the CI-built debug APK. It is not a Play Store production-signed build.