Address type safety, React patterns, and Dockerfile security issues

[Copilot]

Addresses 9 review comments from PR #5 covering type safety violations, React antipatterns, and supply chain security concerns.

Type Safety

• MainTask return type: Changed to void | undefined to allow both ok() and ok(undefined) without forcing callers to choose
• pool function: Removed any cast—AbortError.is() type guard properly narrows to include .reason property
• Schema.ts: Removed unused Timestamp import

React Patterns

• SectionProvider: Fixed Rules of Hooks violation—replaced conditional useStore call with fallback empty store pattern:

  const store = useContext(SectionStoreContext);
  return useStore(store ?? emptyStore, selector);

• Search: Added pathname/searchParams to effect dependencies to close dialog on navigation

Security

• Dockerfile: Pinned turbo version using bunx turbo@2.8.2 instead of unpinned bun install -g turbo to prevent supply chain attacks in both builder and installer stages

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