feat: chrome translation — settings + vocab + self-compassion (final, ~32 sites)

[TrainTravel]

Summary

Final pass of the chrome translation sweep. Adds Japanese, Simplified Chinese, and Traditional Chinese keys to settings screens, vocabulary view, theme/font pickers, and the self-compassion components.

Files (~32 t() / bilingual() sites total):

• LanguageSettingsScreen.tsx
• VocabularyScreen.tsx
• GardenThemeSelector.tsx
• FontPicker.tsx
• SelfCompassionPractice.tsx
• SelfCompassionSeed.tsx (extends the STEP_FR/EN/ES arrays with STEP_JA/ZH_HANS/ZH_HANT so the daily-step bilingual label localizes properly)

Also unifies the Brain Dump translation in LanguageSettingsScreen's preview card with the value used everywhere else (脳のメモ / 想法清空 / 想法清空 — was previously the off-pattern 清空大脑/清空大腦).

Translation samples

• Language settings → 言語設定 / 语言设置 / 語言設定
• I'm learning → 学んでいる言語 / 正在学习 / 正在學習
• Your emotion vocabulary → あなたの感情の語彙 / 你的情绪词汇 / 你的情緒詞彙
• Self-compassion → 自分への思いやり / 自我关怀 / 自我關懷
• Mindfulness (Neff step) → 今この瞬間に気づく / 正念 / 正念
• Choose a garden → 庭を選ぶ / 选一个花园 / 選一個花園

Known carve-outs (intentional)

• Language-NAME strings (opt.native / opt.en in LanguageSettingsScreen, "French journaling practice" subtitle on HomeScreen, "Practice French Conversation" in ChatScreen) are part of the LANGUAGE_NAMES architectural refactor the user flagged as a separate concern.
• ChatScreen has ~10 hard-coded isFr/isEs/isZh ternaries — same pre-existing pattern as ReflectionScreen / FeedbackScreen (per the PR feat: chrome translation — reflection flow (3 screens) #46 carve-out note). Not t() sites, out of scope for chrome-translation.

Test plan

• tsc --noEmit passes
• vitest run — 14 files / 198 tests pass
• Manual: switch primary to ja, open gear → Language settings
• Manual: switch primary to zh-Hans, open Vocabulary screen, cycle through filter chips
• Manual: trigger Self-compassion practice (long emotion-write entry) in zh-Hant

Co-Authored-By: Claude Opus 4.7 (1M context) noreply@anthropic.com