v1.2.0 — New Features

• Favorites: Save translations with a star button. Track lookup frequency for each word.
• CEFR Classification: Words and phrases are automatically classified by CEFR level (A1–C2).
• Notion Integration: Connect your Notion account via OAuth and export favorites as:
- Vocabulary Database (searchable table with CEFR, pronunciation, lookup count)
- Study Report (CEFR distribution chart, frequency rankings, grouped word lists)
- Flashcards (toggle-style cards grouped by level for self-testing)
• Favorites tab with filters by type (words/sentences) and date (today/week/month).
• Export favorites as TXT file.
• Inline translation panel now includes star button and CEFR badge.