Trey t a663bc03cd Add 6 new practice features, offline dictionary, and feature reference ...

New features:
- Offline Dictionary: reverse index of 175K verb forms + 200 common
  words, cached to disk, powers instant word lookups in Stories
- Vocab SRS Review: spaced repetition for course vocabulary cards
  with due count badge and Again/Hard/Good/Easy rating
- Cloze Practice: fill-in-the-blank using SentenceQuizEngine with
  distractor generation from vocabulary pool
- Grammar Exercises: interactive quizzes for 5 grammar topics
  (ser/estar, por/para, preterite/imperfect, subjunctive, personal a)
  with "Practice This" button on grammar note detail
- Listening Practice: listen-and-type + pronunciation check modes
  using Speech framework with word-by-word match scoring
- Conversational Practice: AI chat partner via Foundation Models
  with 10 scenario types, saved to cloud container

Other changes:
- Add Conversation model to SharedModels and cloud container
- Add Info.plist keys for speech recognition and microphone
- Skip speech auth on simulator to prevent crash
- Fix preparing data screen to only show during seed/migration
- Extract courseDataVersion to static property on DataLoader
- Add "How Features Work" reference page in Settings

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

2026-04-13 16:12:36 -05:00

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