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/ComplianceAdvisorWidget.tsx

@@ -60,7 +60,7 @@ export function ComplianceAdvisorWidget({ currentStep = 'default' }: ComplianceA
   return (
     <div
       className={`fixed bottom-6 right-6 z-50 flex max-h-screen flex-col rounded-2xl border border-gray-200 bg-white shadow-2xl transition-all duration-200 ${
-        isExpanded ? 'h-[85vh] w-[760px]' : 'h-[560px] w-[420px]'
+        isExpanded ? 'h-[85vh] w-[960px]' : 'h-[560px] w-[420px]'
       }`}
     >
       {/* Header */}
@@ -122,7 +122,12 @@ export function ComplianceAdvisorWidget({ currentStep = 'default' }: ComplianceA
       </div>
 
       {/* Evidence Workspace */}
-      <EvidenceWorkspace turns={turns} exampleQuestions={exampleQuestions} onExample={submit} />
+      <EvidenceWorkspace
+        turns={turns}
+        expanded={isExpanded}
+        exampleQuestions={exampleQuestions}
+        onExample={submit}
+      />
 
       {/* Input */}
       <div className="rounded-b-2xl border-t border-gray-200 bg-white p-3">