chore: prepare release 2.9.0

docs/releases/v2.9.0.md

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+# MTG Python Deckbuilder v2.9.0
+
+### Summary
+New card browser for exploring 29,839 Magic cards with advanced filters, similar card recommendations, and performance optimizations.
+
+### Added
+- **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
+
+### Changed
+- **Card Database**: Expanded to 29,839 cards (updated from 26,427)
+- **Theme Catalog**: Improved coverage with better filtering
+
+### Removed
+- **Unused Scripts**: Removed `regenerate_parquet.py` (functionality now in web UI setup)
+
+### Fixed
+- **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