The store now keeps one basket per symbol (v2 schema, auto-migrates v1).
Adding a leg from a different symbol no longer wipes the basket — it creates
that symbol's basket and makes it active. The Strategy page shows a symbol
picker at the top (when >1 symbol is saved) to switch between them; switching
auto-fetches that symbol's live marks. "Clear all" clears only the current
symbol's legs; new StrategyStore.clearAll() wipes everything.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>