Add card browser with similar cards and performance optimizations

RELEASE_NOTES_TEMPLATE.md

@@ -1,23 +1,36 @@
 # MTG Python Deckbuilder ${VERSION}
 
 ### Summary
-Card browser with advanced filters, keyboard shortcuts, and responsive design.
+New card browser for exploring and discovering cards with advanced filters, similar card recommendations, and fast performance.
 
 ### Added
-- **Card Browser**: Browse 26,427 Magic cards with powerful filtering
-  - Multi-theme filtering (up to 5 themes), color identity, type, rarity, CMC, power/toughness
-  - Six sorting options including EDHREC popularity
-  - Infinite scroll with cursor-based pagination
-  - Shareable filter URLs
-- **Keyboard Shortcuts**: Efficient navigation
-  - `Enter`: Add first autocomplete match
-  - `Shift+Enter`: Apply filters
-  - `Esc` (double-tap): Clear all filters
-  - Desktop-only help button with keyboard shortcuts reference
-- **Responsive Design**: Mobile-optimized with adaptive grid layout and touch-friendly controls
+- **Card Browser**: Browse and search all 29,839 Magic cards at `/browse/cards`
+  - Smart autocomplete with typo tolerance for card names and themes
+  - Multi-theme filtering (up to 5 themes)
+  - Color, type, rarity, CMC, power/toughness filters
+  - Multiple sorting options including EDHREC popularity
+  - Infinite scroll with shareable URLs
+- **Card Detail Pages**: Individual card pages with similar card suggestions
+  - Enable with `ENABLE_CARD_DETAILS=1` environment variable
+  - Full card stats, oracle text, and theme tags
+  - Similar cards based on theme overlap with color-coded scores
+  - Card preview on hover
+- **Similarity Cache**: Pre-computed card similarities for instant page loads
+  - Build cache with `python -m code.scripts.build_similarity_cache_parquet --parallel`
+  - Control with `SIMILARITY_CACHE_ENABLED` environment variable
+- **Keyboard Shortcuts**: Quick navigation
+  - `Enter` to add autocomplete matches
+  - `Shift+Enter` to apply filters  
+  - Double `Esc` to clear all filters
 
 ### Changed
-- **Theme Catalog**: Improved generation to include more themes and filter out ultra-rare entries
+- **Card Database**: Expanded to 29,839 cards (from 26,427)
+- **Theme Catalog**: Improved coverage and filtering
+
+### Removed
+- **Unused Scripts**: Removed redundant `regenerate_parquet.py`
 
 ### Fixed
-_No unreleased changes yet._
+- **Card Browser**: Improved UI consistency and image loading
+- **Infinite Scroll**: No more duplicate cards when loading more
+- **Sorting**: Sort order now persists correctly across pages