docs: create comprehensive Kotlin conversion plan

fix: URL encode words in pronunciation API calls to handle special characters

docs: finalize Room migration documentation - ALL PHASES COMPLETE

refactor: fix naming inconsistencies in PronounceManager constants

fix: localize pronunciation language spinner to support i18n

docs: add Phase 1 completion summary and update README

fix: force dictionary database recreation from assets

fix: use createFromAsset for all dictionary databases

fix: remove CountDownLatch blocking in PopupActivity.loadData()

fix: Phase 2.1 - Complete Room migration with foreign keys and indices

fix: Phase 2 - Prevent ANR in AI repositories and fix migration

feat: complete migration of AI database from LitePal to Room

fix: sync LitePal database version to 6 to match Room

fix: create missing LitePal AI tables via MIGRATION_5_6

fix: eliminate ANR when saving plans by making save operation fully async