Pinia best practices, common gotchas, and state management patterns. Store Setup - Getting "getActivePinia was called" error at startup → See pinia-no-active-pinia-error - Setup stores missing state in DevTools or SSR → See pinia-setup-store-return-all-state Reactivity - Store destructuring stops updating UI reactively → See pinia-store-destructuring-breaks-reactivity - Store methods lose context in template calls → See store-method-binding-parentheses State Patterns - Filters reset on refresh or can't be shared → See state-url-for-ephemeral-filters - Building production app without DevTools…