feat: add desktop packaging (pywebview + PyInstaller)

- resource_path.py: frozen/dev path resolution for bundled data files
- app_desktop.py: pywebview entry point (Dash in daemon thread)
- app.spec: PyInstaller onedir config with data files and hidden imports
- Updated queries.py, card_browser.py, app.py to use get_resource_path()
- Added pywebview + pyinstaller to project dependencies
- Fixed unresolved merge conflict in .gitignore
- Removed stale 01_nhs_classic.html and AdditionalAnalytics.md

.gitignore

@@ -36,16 +36,10 @@ logs/*.jsonl
 .web/
 .states/
 
-<<<<<<< Updated upstream
-# SQLite database (will contain local data)
-#*.db
-#*.sqlite
-=======
 # SQLite databases (except pathways.db which contains pre-computed data)
 *.db
 !data/pathways.db
 *.sqlite
->>>>>>> Stashed changes
 
 # Snowflake result cache
 data/cache/