- Reuse a single SQLite connection instead of open/close per query
- Add in-memory cache for frequently accessed data (brands, models,
categories) — 1000x faster on repeated access
- Enable WAL journal mode, 8MB cache, 64MB mmap for faster reads
- Cache terminal size per render cycle to avoid repeated getmaxyx()
- Close DB connection on app exit
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Add the three core modules that all screens depend on:
- keybindings.py: Key constants (curses codes) and KeyBindings registry
- navigation.py: Stack-based screen navigation with breadcrumbs
- screens.py: Screen base class with on_enter/on_key/render lifecycle
Includes 31 tests covering all public APIs.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
