MTG Python Deckbuilder v2.9.0

Card Database: Expanded to 29,839 cards (updated from 26,427)
Theme Catalog: Improved coverage with better filtering

New card browser for exploring 29,839 Magic cards with advanced filters, similar card recommendations, and performance optimizations.

Card Browser: Browse and search all Magic cards at /browse/cards
- Smart autocomplete for card names and themes with typo tolerance
- Multi-theme filtering (up to 5 themes)
- Color, type, rarity, CMC, power/toughness filters
- Multiple sorting options including EDHREC popularity
- Infinite scroll with shareable filter URLs
Card Detail Pages: Individual card pages with similar card suggestions
- Full card stats, oracle text, and theme tags
- Similar cards based on theme overlap
- Color-coded similarity scores
- Card preview on hover
- Enable with ENABLE_CARD_DETAILS=1 environment variable
Similarity Cache: Pre-computed card similarities for fast page loads
- Build cache with parallel processing script
- Automatically used when available
- Control with SIMILARITY_CACHE_ENABLED environment variable
Keyboard Shortcuts: Quick navigation in card browser
- Enter to add autocomplete matches
- Shift+Enter to apply filters
- Double Esc to clear all filters

Unused Scripts: Removed regenerate_parquet.py (functionality now in web UI setup)

Card Browser UI: Improved styling consistency and card image loading
Infinite Scroll: Fixed cards appearing multiple times when loading more results
Sorting: Sort order now persists correctly when scrolling through all pages