Jeroen1991z wires Mike into Dutch case law and legislation

- New `backend/src/lib/rechtspraak.ts`: API client for Dutch case law
  (rechtspraak.nl Atom/XML) and legislation (wetten.overheid.nl SRU),
  with court code → name mapping and full-text extraction capped at 15 kB.

- `chatTools.ts`: Three new agentic tools (search_case_law, fetch_case_law,
  search_legislation) registered in RECHTSPRAAK_TOOLS; handlers in
  runToolCalls emit SSE activity events; runLLMStream accepts
  `rechtspraakEnabled` param (default ON); ParsedCitation/normalizeCitation/
  extractAnnotations extended for case_law and legislation citation types;
  system prompt extended with Dutch law search strategy and citation format.

- `chat.ts` / `projectChat.ts`: Accept `rechtspraak_enabled` from request body.

- `llm/models.ts`: Claude Sonnet 4.6 is now the default model for chat,
  tabular review, and title generation.

- `types.ts`: New AssistantEvent variants for case law / legislation activity;
  MikeCitationAnnotation extended with ecli, external_url, court, judgment_date,
  title, article optional fields; MikeMessage gains `rechtspraakEnabled`.

- `mikeApi.ts`: `rechtspraak_enabled` added to streamChat / streamProjectChat.

- `useAssistantChat.ts`: Pass rechtspraakEnabled through to API; handle four new
  SSE event types with streaming placeholders and thinking indicator.

- `ChatInput.tsx`: Scale icon toggle button (default ON) for rechtspraak.nl lookup.

- `AssistantMessage.tsx`: Render case_law_searched_start/searched, case_law_fetched,
  legislation_searched event blocks with blue dot indicators.

- `ChatView.tsx`: Citation click opens external URL in new tab when
  citation.external_url is set (case law / legislation), otherwise opens
  the document side panel as before.

- `ModelToggle.tsx`: DEFAULT_MODEL_ID changed from gemini-3-flash-preview to
  claude-sonnet-4-6.

https://claude.ai/code/session_016JxWnFc3baeDgkzDgxY6ex

- Add required version=1.2 SRU parameter
- Use correct BWB index overheidbwb.titel instead of unsupported title/text
- Remove unsupported dcx recordSchema (use default)
- Update XML parsing to use dcterms: namespace

https://claude.ai/code/session_016JxWnFc3baeDgkzDgxY6ex

- Add searchMvT function querying SGD (Staten-Generaal Digitaal) via SRU
- Split RECHTSPRAAK_TOOLS into CASE_LAW_TOOLS, LEGISLATION_TOOLS, MVT_TOOLS
- Add searchSources param to runLLMStream for per-source control
- Inject Dutch-only instruction when internet/AI knowledge is disabled
- Replace single rechtspraak button with Bronnen dropdown in ChatInput
  showing toggles for rechtspraak.nl, wetten.overheid.nl, MvT, and AI kennis
- Wire searchSources through frontend types → mikeApi → route handlers

https://claude.ai/code/session_016JxWnFc3baeDgkzDgxY6ex

The overheidbwb.titel index searches law titles, not article content.
Guide the AI to search by law name (e.g. 'Burgerlijk Wetboek Boek 6')
rather than by topic keywords like 'onrechtmatige daad'.

https://claude.ai/code/session_016JxWnFc3baeDgkzDgxY6ex

- Add fetchLegislationArticle() that fetches BWB XML via manifest
  or locatie_toestand URL, then extracts article text by number
- Store xml_url (latest version) in LegislationResult from search
- Deduplicate search results keeping the newest version's XML URL
- Add fetch_legislation_article tool to LEGISLATION_TOOLS
- Add tool handler in runLLMStream

https://claude.ai/code/session_016JxWnFc3baeDgkzDgxY6ex

The Memorie van Toelichting source is removed from backend tools and frontend
UI. The "Eigen kennis AI" toggle is also removed - the AI always uses its own
training. The sources dropdown button is gone entirely; rechtspraak.nl and
wetten.overheid.nl are now always enabled and hardcoded on submit.

https://claude.ai/code/session_016JxWnFc3baeDgkzDgxY6ex

- Add r.o. (rechtsoverweging) field to case law citations; system prompt
  instructs model to fill it from fetched judgment text
- Fix formatCitationPage: show "r.o. X" for case law, article ref for
  legislation, pagina N for documents - eliminating "Page undefined"
- System prompt: place citation marker directly after the legal reference
  (after "BW"/"Rv"), not after "geldt dat"
- System prompt: instruct model to use URL from fetch_legislation_article
  (which now includes today's date) rather than constructing its own
- fetchLegislationArticle: include current date in returned URL

https://claude.ai/code/session_016JxWnFc3baeDgkzDgxY6ex