English spellcheck suggestions with Add-to-dictionary in the native context menu plus a Settings toggle. Typewriter caret-centering mode. OS file associations for .md/.txt and Open File wording. Updater: release URL surfaced, single progress listener, two-byte tarball check, installer wait guard. Search/installer test suites registered; chapter-list layout polish; ignore KDE .directory files.
- Configure AppImage (primary) + Debian .deb (secondary) into releases/.
- White Folio app icon, Office category, io.atitlan.folio appId, folio
executable; no file associations (none invented).
- Bundle tests/selftest-scenario.js so the packaged binary can be exercised
in place via FOLIO_SELF_TEST (inert during normal launches).
