Replace default fuzzy filter with substring matching where multi-word
queries require all words to appear. Fix auto-filter typing to properly
batch returned commands instead of discarding them. Update tests to
drive command loops and verify exact substring matches.
- Add auto-start filter when typing alphanumeric characters
- Refactor item struct to use explicit station field and isFavorite flag
- Show ★ prefix for favorites in list rendering
- Improve description formatting with bullet separators
- Include URL in FilterValue for better search
- Update help text and add corresponding test
