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/KnowledgeUnitCard.tsx

@@ -3,26 +3,49 @@
 import { useState } from 'react'
 import { ChevronDown, ChevronRight, ExternalLink } from 'lucide-react'
 import type { KnowledgeUnit } from '@/lib/sdk/advisor/evidence'
+import { resolveRegulation } from '@/lib/sdk/advisor/regulation-display'
 
 /**
- * A source rendered as a hierarchical Knowledge Unit (Regelwerk → Section → Paragraph → Footnote),
- * not a text-list line. [öffnen] resolves to the original source when available; the optional
- * snippet lets the user peek the cited text.
+ * A single evidence unit. Standalone: friendly regulation name + hierarchy. Compact (inside a
+ * document group): chapter/section only (the group already names the regulation). [öffnen] opens
+ * the original source; the optional snippet lets the user peek the cited text.
  */
-export function KnowledgeUnitCard({ unit }: { unit: KnowledgeUnit }) {
+export function KnowledgeUnitCard({ unit, compact }: { unit: KnowledgeUnit; compact?: boolean }) {
   const [open, setOpen] = useState(false)
-  const crumbs = [unit.section, unit.subsection, unit.paragraph, unit.footnoteRef].filter(Boolean)
+  const d = resolveRegulation(unit.regulation)
+  const crumbs = [unit.section, unit.subsection, unit.paragraph, unit.footnoteRef].filter(
+    (x): x is string => Boolean(x),
+  )
   const href = unit.open?.originalUrl
-  const canOpen = href && /^https?:\/\//i.test(href)
+  const canOpen = !!href && /^https?:\/\//i.test(href)
+
+  let header: string
+  let sub: string[]
+  if (!compact) {
+    header = d.familyLabel
+    sub = crumbs
+  } else if (d.chapter) {
+    header = `Kapitel ${d.chapter}`
+    sub = crumbs
+  } else {
+    header = crumbs[0] || unit.label || d.familyLabel
+    sub = crumbs.slice(1)
+  }
 
   return (
-    <div className="rounded-lg border border-gray-200 bg-white p-2.5">
+    <div
+      className={
+        compact
+          ? 'rounded-md border border-gray-100 bg-gray-50 p-2'
+          : 'rounded-lg border border-gray-200 bg-white p-2.5'
+      }
+    >
       <div className="flex items-start justify-between gap-2">
         <div className="min-w-0">
-          <div className="truncate text-xs font-semibold text-gray-900">{unit.regulation.short}</div>
-          {crumbs.length > 0 ? (
+          <div className="truncate text-xs font-semibold text-gray-900">{header}</div>
+          {sub.length > 0 ? (
             <div className="mt-0.5 flex flex-wrap items-center gap-x-1 text-[11px] text-gray-500">
-              {crumbs.map((c, i) => (
+              {sub.map((c, i) => (
                 <span key={i} className="flex items-center gap-1">
                   {i > 0 && <span className="text-gray-300">›</span>}
                   {c}
@@ -30,8 +53,9 @@ export function KnowledgeUnitCard({ unit }: { unit: KnowledgeUnit }) {
               ))}
             </div>
           ) : (
+            !compact &&
             unit.label &&
-            unit.label !== unit.regulation.short && (
+            unit.label !== header && (
               <div className="mt-0.5 text-[11px] text-gray-500">{unit.label}</div>
             )
           )}