v0.1.2

Add multi-jurisdiction support: UK and Saudi Arabia workspace switcher

- New jurisdiction picker as first setup step (SA or UK, multi-select)
- JurisdictionContext with per-jurisdiction theme tokens (accent, bg, sidebar, overlays)
- Sidebar dynamically themed to active jurisdiction (green for UK, gold for SA)
- Jurisdiction switcher in sidebar footer when multiple jurisdictions installed
- Jurisdiction-aware RAG: UK law uses data/vector-store-uk/, SA uses data/vector-store/
- UK and Saudi system prompts in lib/claude.ts
- Page background CSS variable (--mizan-page-bg) driven by active jurisdiction
- Bump version to 0.1.2

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>