Add LineItem, ProviderCardCompact, PackageDetail for Package Select page

LineItem (molecule):
- Name + optional info tooltip + optional price
- Allowance asterisk, total variant (bold + top border)
- Reusable for package contents, order summaries, invoices

ProviderCardCompact (molecule):
- Horizontal layout: image left, name + location + rating right
- Used at top of Package Select page to show selected provider

PackageDetail (organism):
- Right-side detail panel for Package Select page
- Name/price header, Make Arrangement + Compare CTAs
- Grouped LineItem sections, total row, T&C footer
- PackageSelectPage story: full page with filter chips, package
  list (ServiceOption), sticky detail panel, and Navigation

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/components/molecules/ProviderCardCompact/index.ts

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+export { ProviderCardCompact, type ProviderCardCompactProps } from './ProviderCardCompact';