🚀 Studify 0.1.4

✨ New Features

🧠 SM2 Spaced Repetition Algorithm
- Full integration for study cards: scheduling, intervals, repetitions, easiness factor, and review dates.
- New methods: sm2_next_card, review, first_review.
- Automatic advancement to next card based on SM2 rules.
📝 Studyset Editing & Card Management
- Add new cards via GUI (add_new_card, bck_add_card).
- Edit scene with fields for new questions/answers.
- Remove cards with rm_card.
☁️ Cloud Update Functionality
- UpdateChecker class checks for new GitHub releases.
- Auto-updates app via git pull.
- Handles version files and update errors gracefully.
🔄 Cloud Data Sync (Firebase Integration)
- Update user display name, track study time, and re-authenticate via Firestore REST API.
- Creates user documents + private/vault subdocuments.
- Syncs study time and username remotely.
🔐 Auth Portal
- Flask-based Google login portal (_authflask.py).
- Initializes Firebase Auth in a browser.
👥 Club / Online Interactivity (Prototype)
- New Clubs scene in GUI as placeholder for future social features.
🔔 Update Dialog & Logic
- GUI + CLI prompts when a new version is available.
- Initializes git repo if missing.
🎨 General GUI Improvements
- Title scene with navigation for flashcards, stats, and study sessions.
- Improved layout and widget organization.
- Confirmation dialogs for actions like adding cards.

Author: Levi 태선