feat: add flashcard system with decks, cards, and study mode

[tpaulshippy]

Summary

• Add flashcard system with Deck and Flashcard models for storing flashcard decks per profile
• Implement CRUD operations via REST API endpoints
• Add AI tool calls (create_flashcard_deck, create_flashcard) for bot to create flashcards during chat
• Add frontend screens: flashcard list, deck detail, card edit, and study mode with flip animation
• Add hamburger menu to toggle between Chat and Flashcards views

Features

• Users can create, edit, and delete flashcard decks
• Each deck contains multiple flashcards with front/back text
• Bot can create flashcards via tool calls during chat
• Study mode with flip card animation to reveal answers
• Navigate between cards in a deck (prev/next)

[coderabbitai]

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: d4304604-17ba-417b-a90a-8041438fd137

📥 Commits

Reviewing files that changed from the base of the PR and between 60c58f9 and 64a9118.

📒 Files selected for processing (15)

• back/bots/migrations/0035_deck_flashcard.py
• back/bots/models/__init__.py
• back/bots/models/chat.py
• back/bots/models/flashcard.py
• back/bots/serializers/__init__.py
• back/bots/serializers/flashcard_serializer.py
• back/bots/viewsets/__init__.py
• back/bots/viewsets/flashcard_viewset.py
• back/server/urls.py
• front/api/flashcards.ts
• front/app/_layout.tsx
• front/app/flashcards.tsx
• front/app/flashcards/cardEdit.tsx
• front/app/flashcards/deck.tsx
• front/app/flashcards/study.tsx

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch flashcards

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