feat(advisor): Case Workspace v2 — Evidence grouping, human names, 3-column, summary

Reworks the advisor toward a Compliance Case Workspace (review feedback):
- Rename user-facing "Quellen" -> "Evidence".
- Evidence grouped by document/regulation family (count + expandable) — no more
  unsorted DSK/DSK/DPF/... jumble.
- Human-readable regulation names via a display registry (DSK Sdm B51 -> "DSK
  Standard-Datenschutzmodell (SDM)" / Kapitel B51); generic, bridges G2.
- Evidence summary "Antwort basiert auf" with meaningful counts; Regelwerke = distinct
  FAMILIES (fixes the inflated count). NO fabricated trust score (needs a defined basis).
- Expanded mode = 3-column workspace (question+summary | answer | evidence, independent
  scroll) + history switcher; narrow mode stays stacked.
- Prompt: push aggressive markdown structure (## per aspect, numbered phases).

Deferred/coordinated on board: C8 diagrams (RAG contract), answer<->evidence coupling
[1] (needs LLM citation anchors — phase 2), G1 retrieval relevance + G2 metadata (RAG).
tsc clean, 17 vitest, check-loc 0.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

admin-compliance/components/sdk/advisor/TurnView.tsx

@@ -1,13 +1,13 @@
 'use client'
 
 import type { AdvisorTurn } from './useAdvisorStream'
-import { StatsBar } from './StatsBar'
+import { EvidenceSummary } from './EvidenceSummary'
 import { AnswerPane } from './AnswerPane'
-import { SourcesPane } from './SourcesPane'
+import { EvidencePane } from './EvidencePane'
 import { FiguresPane } from './FiguresPane'
 import { FootnotesPane } from './FootnotesPane'
 
-/** One question/answer turn rendered as stacked evidence panels. */
+/** One question/answer turn as stacked panels (collapsed / narrow layout). */
 export function TurnView({ turn, showQuestion }: { turn: AdvisorTurn; showQuestion?: boolean }) {
   const streaming = turn.status === 'streaming'
   return (
@@ -17,9 +17,9 @@ export function TurnView({ turn, showQuestion }: { turn: AdvisorTurn; showQuesti
           <span className="font-medium text-gray-400">Frage:</span> {turn.question}
         </div>
       )}
-      <StatsBar stats={turn.meta.stats} />
+      <EvidenceSummary meta={turn.meta} />
       <AnswerPane answer={turn.answer} streaming={streaming} error={turn.error} />
-      <SourcesPane sources={turn.meta.sources} />
+      <EvidencePane sources={turn.meta.sources} />
       <FiguresPane figures={turn.meta.figures} />
       <FootnotesPane footnotes={turn.meta.footnotes} />
     </div>