chore: prepare release v2.8.0

RELEASE_NOTES_TEMPLATE.md

@@ -1,25 +1,13 @@
 # MTG Python Deckbuilder ${VERSION}
 
 ### Summary
-Theme catalog improvements with faster processing, tag search features, regeneration fixes, and browser performance optimizations.
+_No unreleased changes yet._
 
 ### Added
-- **Theme Catalog Optimization**:
-  - Consolidated theme enrichment pipeline
-  - Tag search API for theme-based card discovery
-  - Commander browser theme autocomplete with keyboard navigation
-  - Tag index for faster queries
-- **Theme Browser Keyboard Navigation**: Arrow keys navigate search results (ArrowUp/Down, Enter, Escape)
-- **Card Data Consolidation** (from previous release):
-  - Optimized format with smaller file sizes
-  - "Rebuild Card Files" button in Setup page
-  - Automatic updates after tagging/setup
+_No unreleased changes yet._
 
 ### Changed
-- **Theme Browser Performance**: Theme pages now load much faster
-- **Theme Browser UI**: Removed color filter for cleaner interface
+_No unreleased changes yet._
 
 ### Fixed
-- **Theme Regeneration**: Theme catalog can now be fully rebuilt from scratch
-  - Fixed placeholder data appearing in fresh installations
-  - Examples now generated from actual card data
+_No unreleased changes yet._