feat: add inline preview for Wochenübersicht reports

- Backend stores per-KW summary in report_data (count, ICD status, FG split)
- WochenuebersichtViewer component shows expandable KW table with totals
- Expand/collapse pattern matching ReportsPage (ChevronRight/Down, useReportData)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

backend/app/api/reports.py

@@ -360,11 +360,29 @@ def generate_wochenuebersicht(
         )
         .first()
     )
+    # Build per-KW summary for frontend preview
+    fg1, fg2 = fallgruppen
+    fg1_label, fg2_label = type_cfg["fg_labels"]
+    weeks_summary = []
+    for kw in sorted(cases_by_kw.keys(), reverse=True):
+        kw_cases = cases_by_kw[kw]
+        weeks_summary.append({
+            "kw": kw,
+            "count": len(kw_cases),
+            "with_icd": sum(1 for c in kw_cases if c.icd),
+            "fg1_count": sum(1 for c in kw_cases if c.fallgruppe == fg1),
+            "fg2_count": sum(1 for c in kw_cases if c.fallgruppe == fg2),
+            "gutachten": sum(1 for c in kw_cases if c.gutachten),
+        })
+
     report_data = {
         "export_type": export_type,
         "kw_von": kw_von,
         "kw_bis": kw_bis,
         "case_count": len(cases),
+        "fg1_label": fg1_label,
+        "fg2_label": fg2_label,
+        "weeks": weeks_summary,
     }
     if report:
         report.report_date = date.today()

frontend/src/pages/WochenuebersichtPage.tsx

@@ -1,9 +1,10 @@
-import { useCallback, useState } from 'react'
-import { Download, FileSpreadsheet, Loader2, Plus, Upload } from 'lucide-react'
+import { Fragment, useCallback, useState } from 'react'
+import { ChevronDown, ChevronRight, Download, FileSpreadsheet, Loader2, Plus, Upload } from 'lucide-react'
 import api from '@/services/api'
 import { useAuth } from '@/context/AuthContext'
 import {
   useReports,
+  useReportData,
   useGenerateWochenuebersicht,
   useDeleteReports,
   useUploadWochenuebersichtIcd,
@@ -16,7 +17,7 @@ import {
   Select, SelectContent, SelectItem, SelectTrigger, SelectValue,
 } from '@/components/ui/select'
 import {
-  Table, TableBody, TableCell, TableHead, TableHeader, TableRow,
+  Table, TableBody, TableCell, TableFooter, TableHead, TableHeader, TableRow,
 } from '@/components/ui/table'
 import { Skeleton } from '@/components/ui/skeleton'
 import { Alert, AlertDescription } from '@/components/ui/alert'
@@ -86,6 +87,10 @@ export function WochenuebersichtPage() {
   const [uploadSuccess, setUploadSuccess] = useState('')
   const uploadMutation = useUploadWochenuebersichtIcd()
 
+  // Inline expansion state
+  const [expandedId, setExpandedId] = useState<number | null>(null)
+  const { data: reportData, isLoading: reportDataLoading } = useReportData(expandedId)
+
   // Drag state
   const [isDragOver, setIsDragOver] = useState(false)
 
@@ -296,38 +301,72 @@ export function WochenuebersichtPage() {
                 </TableRow>
               </TableHeader>
               <TableBody>
-                {reports.map((r) => (
-                  <TableRow key={r.id}>
-                    <TableCell>{formatDate(r.report_date)}</TableCell>
-                    <TableCell>{r.jahr}</TableCell>
-                    <TableCell>KW {r.kw}</TableCell>
-                    <TableCell>{REPORT_TYPE_LABELS[r.report_type] ?? r.report_type}</TableCell>
-                    <TableCell>{formatDateTime(r.generated_at)}</TableCell>
-                    <TableCell className="text-right">
-                      <Button
-                        variant="outline"
-                        size="sm"
-                        onClick={() => downloadReport(r.id)}
+                {reports.map((r) => {
+                  const isExpanded = expandedId === r.id
+                  return (
+                    <Fragment key={r.id}>
+                      <TableRow
+                        className="cursor-pointer hover:bg-muted/50"
+                        onClick={() => setExpandedId(isExpanded ? null : r.id)}
                       >
-                        <Download className="mr-1.5 h-4 w-4" />
-                        Download
-                      </Button>
-                      {isAdmin && (
-                        <Button
-                          variant="ghost"
-                          size="sm"
-                          className="ml-2 text-destructive"
-                          onClick={async () => {
-                            await deleteMutation.mutateAsync([r.id])
-                          }}
-                          disabled={deleteMutation.isPending}
-                        >
-                          Löschen
-                        </Button>
+                        <TableCell>
+                          <span className="inline-flex items-center gap-1.5">
+                            {isExpanded
+                              ? <ChevronDown className="size-4 text-muted-foreground" />
+                              : <ChevronRight className="size-4 text-muted-foreground" />}
+                            {formatDate(r.report_date)}
+                          </span>
+                        </TableCell>
+                        <TableCell>{r.jahr}</TableCell>
+                        <TableCell>KW {r.kw}</TableCell>
+                        <TableCell>{REPORT_TYPE_LABELS[r.report_type] ?? r.report_type}</TableCell>
+                        <TableCell>{formatDateTime(r.generated_at)}</TableCell>
+                        <TableCell className="text-right" onClick={(e) => e.stopPropagation()}>
+                          <Button
+                            variant="outline"
+                            size="sm"
+                            onClick={() => downloadReport(r.id)}
+                          >
+                            <Download className="mr-1.5 h-4 w-4" />
+                            Download
+                          </Button>
+                          {isAdmin && (
+                            <Button
+                              variant="ghost"
+                              size="sm"
+                              className="ml-2 text-destructive"
+                              onClick={async () => {
+                                await deleteMutation.mutateAsync([r.id])
+                              }}
+                              disabled={deleteMutation.isPending}
+                            >
+                              Löschen
+                            </Button>
+                          )}
+                        </TableCell>
+                      </TableRow>
+                      {isExpanded && (
+                        <TableRow>
+                          <TableCell colSpan={6} className="p-0">
+                            {reportDataLoading ? (
+                              <div className="p-6">
+                                <Skeleton className="h-48 w-full" />
+                              </div>
+                            ) : reportData ? (
+                              <div className="p-4 border-t bg-muted/20">
+                                <WochenuebersichtViewer data={reportData} />
+                              </div>
+                            ) : (
+                              <div className="p-6 text-center text-muted-foreground">
+                                Keine Vorschaudaten verfügbar.
+                              </div>
+                            )}
+                          </TableCell>
+                        </TableRow>
                       )}
-                    </TableCell>
-                  </TableRow>
-                ))}
+                    </Fragment>
+                  )
+                })}
               </TableBody>
             </Table>
           ) : (
@@ -445,3 +484,94 @@ export function WochenuebersichtPage() {
     </div>
   )
 }
+
+
+// ---------------------------------------------------------------------------
+// Wochenübersicht Viewer (inline preview)
+// ---------------------------------------------------------------------------
+
+interface WeekSummary {
+  kw: number
+  count: number
+  with_icd: number
+  fg1_count: number
+  fg2_count: number
+  gutachten: number
+}
+
+// eslint-disable-next-line @typescript-eslint/no-explicit-any
+function WochenuebersichtViewer({ data }: { data: Record<string, any> }) {
+  const weeks: WeekSummary[] = data?.weeks ?? []
+  const fg1Label: string = data?.fg1_label ?? 'FG1'
+  const fg2Label: string = data?.fg2_label ?? 'FG2'
+  const kwVon: number = data?.kw_von ?? '?'
+  const kwBis: number = data?.kw_bis ?? '?'
+  const totalCases: number = data?.case_count ?? 0
+
+  if (!weeks.length) {
+    return (
+      <p className="py-4 text-center text-muted-foreground">
+        Keine Vorschaudaten verfügbar.
+      </p>
+    )
+  }
+
+  const totals = weeks.reduce(
+    (acc, w) => ({
+      count: acc.count + w.count,
+      with_icd: acc.with_icd + w.with_icd,
+      fg1: acc.fg1 + w.fg1_count,
+      fg2: acc.fg2 + w.fg2_count,
+      gutachten: acc.gutachten + w.gutachten,
+    }),
+    { count: 0, with_icd: 0, fg1: 0, fg2: 0, gutachten: 0 },
+  )
+
+  return (
+    <div className="space-y-3">
+      <div className="flex items-center gap-4 text-sm text-muted-foreground">
+        <span>KW {kwVon}–{kwBis}</span>
+        <span>{totalCases} Fälle gesamt</span>
+        <span>{totals.with_icd} mit ICD</span>
+      </div>
+      <Table>
+        <TableHeader>
+          <TableRow>
+            <TableHead>KW</TableHead>
+            <TableHead className="text-right">Fälle</TableHead>
+            <TableHead className="text-right">{fg1Label}</TableHead>
+            <TableHead className="text-right">{fg2Label}</TableHead>
+            <TableHead className="text-right">Gutachten</TableHead>
+            <TableHead className="text-right">mit ICD</TableHead>
+          </TableRow>
+        </TableHeader>
+        <TableBody>
+          {weeks.map((w) => (
+            <TableRow key={w.kw}>
+              <TableCell>KW {w.kw}</TableCell>
+              <TableCell className="text-right">{w.count}</TableCell>
+              <TableCell className="text-right">{w.fg1_count}</TableCell>
+              <TableCell className="text-right">{w.fg2_count}</TableCell>
+              <TableCell className="text-right">{w.gutachten}</TableCell>
+              <TableCell className="text-right">
+                {w.with_icd}/{w.count}
+              </TableCell>
+            </TableRow>
+          ))}
+        </TableBody>
+        <TableFooter>
+          <TableRow>
+            <TableCell className="font-bold">Gesamt</TableCell>
+            <TableCell className="text-right font-bold">{totals.count}</TableCell>
+            <TableCell className="text-right font-bold">{totals.fg1}</TableCell>
+            <TableCell className="text-right font-bold">{totals.fg2}</TableCell>
+            <TableCell className="text-right font-bold">{totals.gutachten}</TableCell>
+            <TableCell className="text-right font-bold">
+              {totals.with_icd}/{totals.count}
+            </TableCell>
+          </TableRow>
+        </TableFooter>
+      </Table>
+    </div>
+  )
+}