feat: run a Saved Legal Task from a Review Table row

Make the "Suggested Saved Legal Task" column actionable. When Gary
suggests a recognized task for a document, a lawyer can launch that
task in the assistant prefilled with the row's context.

- suggestedTask.ts: maps the eight recognized task names to built-in
  Saved Legal Task ids. Matching tolerates whitespace, case, tag
  brackets, and trailing punctuation but is never fuzzy - an
  unrecognized value resolves to null rather than guessing. Also
  builds the row-context prompt (task name, matter, document name,
  extracted fields, and attorney-review safety language).
- RunSuggestedTaskModal.tsx: a simple "Run Saved Legal Task?"
  confirmation with a prompt preview and Open in Assistant / Cancel.
- TRSidePanel: shows a "Run Suggested Task" action - only on the
  Suggested Saved Legal Task column's cell, and only when the value
  resolves to a recognized task and the cell has finished generating.
- TabularReviewView: resolves the row's suggested task, builds the
  row-context prompt from the row's other cells, and on confirm
  creates a chat, prefills an assistant draft, and opens it.
- Prefill, not auto-run: a new newChatDraft channel on
  ChatHistoryContext carries a draft (content + workflow + attached
  document) that ChatInput seeds its initial state from. The lawyer
  reviews and sends manually - nothing is auto-submitted. ChatView
  renders an empty-with-draft chat instead of the loading skeleton.
- The row's document is attached via the existing chat file
  mechanism; the document_id rides in the attachment, never in the
  visible prompt text. No raw internal ids appear in the prompt.
- Safety: the prompt instructs Gary to treat the row as draft and
  unverified, use the uploaded document, not invent facts / dates /
  legal authorities / deadlines / parties, and flag uncertainty.
- Docs: add "Running a Saved Legal Task from a Review Table" to the
  U.S. lawyer guide; add a terminology-map entry.
- Tests: suggestedTask.test.ts covers the eight-task mapping (and
  that each id is a real assistant built-in), match tolerance, the
  no-fuzzy-match guarantee, blank/Unknown/None handling, the prompt's
  attorney-review language, Unknown fallbacks, and the absence of raw
  internal ids and legacy terminology.