feat(report): per-museum trend lines in PDF report chart

When multiple museums are present, the report trend chart now renders one
colored line per museum plus a bold Total line, mirroring dashboard behavior.
Legend is updated to list each museum with its corresponding color.

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

src/components/Report/ReportDocument.tsx

@@ -156,7 +156,7 @@ interface Props { data: ReportData; }
 
 export function ReportDocument({ data }: Props) {
   const { config: cfg, metrics, prevMetrics, comparisonPeriodLabel,
-    trendLabels, trendCurrent, trendPrevious,
+    trendLabels, trendCurrent, trendPrevious, trendMuseums,
     museumData, channelBreakdown, districtBreakdown,
     pilgrimCapture, generatedAt } = data;
 
@@ -314,21 +314,33 @@ export function ReportDocument({ data }: Props) {
         {cfg.showTrendChart && (
           <View style={S.sectionGap}>
             <SectionHeading title={trendTitle} color={color} />
-            {cfg.includeComparison && (
-              <View style={S.legendRow}>
-                <View style={S.legendItem}>
-                  <View style={[S.legendDot, { backgroundColor: color }]} />
-                  <Text style={S.legendLabel}>{period}</Text>
+            <View style={S.legendRow}>
+              {trendMuseums.length >= 2 && trendMuseums.map((m, i) => (
+                <View key={m.name} style={S.legendItem}>
+                  <View style={[S.legendDot, { backgroundColor: CHART_PALETTE[i % CHART_PALETTE.length] }]} />
+                  <Text style={S.legendLabel}>{m.name}</Text>
                 </View>
+              ))}
+              <View style={S.legendItem}>
+                <View style={[S.legendDot, { backgroundColor: color }]} />
+                <Text style={S.legendLabel}>{trendMuseums.length >= 2 ? `Total · ${period}` : period}</Text>
+              </View>
+              {cfg.includeComparison && (
                 <View style={S.legendItem}>
                   <View style={[S.legendDot, { backgroundColor: '#94a3b8' }]} />
                   <Text style={S.legendLabel}>{comparisonPeriodLabel}</Text>
                 </View>
-              </View>
-            )}
+              )}
+            </View>
             <View style={S.chartWrap}>
               <PdfTrendChart labels={trendLabels} current={trendCurrent}
-                previous={trendPrevious} color={color} width={chartW} height={155} />
+                previous={trendPrevious} color={color} width={chartW} height={155}
+                series={trendMuseums.length >= 2 ? trendMuseums.map((m, i) => ({
+                  label: m.name,
+                  color: CHART_PALETTE[i % CHART_PALETTE.length],
+                  data: m.values,
+                })) : undefined}
+              />
             </View>
           </View>
         )}

src/components/Report/reportCharts.tsx

@@ -19,12 +19,14 @@ interface TrendChartProps {
   current: number[];
   previous: number[] | null;
   color: string;
+  series?: Array<{ label: string; color: string; data: number[] }>;
   width?: number;
   height?: number;
 }
 
-export function PdfTrendChart({ labels, current, previous, color, width = 470, height = 155 }: TrendChartProps) {
-  const allValues = [...current, ...(previous ?? [])].filter(v => v > 0);
+export function PdfTrendChart({ labels, current, previous, color, series, width = 470, height = 155 }: TrendChartProps) {
+  const seriesValues = (series ?? []).flatMap(s => s.data);
+  const allValues = [...current, ...(previous ?? []), ...seriesValues].filter(v => v > 0);
   const max = allValues.length > 0 ? Math.max(...allValues) : 1;
   // padL wide enough for y-axis labels like "1.2M"
   const padL = 38, padR = 8, padT = 10, padB = 20;
@@ -66,10 +68,16 @@ export function PdfTrendChart({ labels, current, previous, color, width = 470, h
           stroke="#94a3b8" strokeWidth={1.5} strokeDasharray="4 3" fill="none" />
       )}
 
-      {/* Current period line */}
+      {/* Per-museum series */}
+      {(series ?? []).map(s => s.data.some(v => v > 0) && (
+        <Polyline key={s.label} points={toPoints(s.data)}
+          stroke={s.color} strokeWidth={1.5} fill="none" />
+      ))}
+
+      {/* Current period total line */}
       {current.some(v => v > 0) && (
         <Polyline points={toPoints(current)}
-          stroke={color} strokeWidth={2.5} fill="none" />
+          stroke={color} strokeWidth={series && series.length >= 2 ? 2 : 2.5} fill="none" />
       )}
 
       {/* X-axis week labels */}

src/components/Report/reportHelpers.ts

@@ -106,6 +106,7 @@ export interface ReportData {
   trendLabels: string[];
   trendCurrent: number[];
   trendPrevious: number[] | null;
+  trendMuseums: Array<{ name: string; values: number[] }>;
   museumData: MuseumDataRow[];
   museumBreakdown: DimensionBreakdown;
   channelBreakdown: DimensionBreakdown;
@@ -195,6 +196,11 @@ export function computeReportData(allData: MuseumRecord[], cfg: ReportConfig): R
     ? Array.from({ length: maxLen }, (_, i) => prevTrend.values[i] ?? 0)
     : null;
 
+  const trendMuseums = Object.keys(groupByMuseum(currRows, cfg.includeVAT)).map(name => {
+    const mt = buildTrend(currRows.filter(r => r.museum_name === name), cfg.startDate, cfg);
+    return { name, values: Array.from({ length: maxLen }, (_, i) => mt.values[i] ?? 0) };
+  });
+
   const currMuseumGroups = groupByMuseum(currRows, cfg.includeVAT);
   const prevMuseumGroups = cfg.includeComparison ? groupByMuseum(prevRows, cfg.includeVAT) : {};
   const museumData: MuseumDataRow[] = Object.entries(currMuseumGroups)
@@ -226,6 +232,7 @@ export function computeReportData(allData: MuseumRecord[], cfg: ReportConfig): R
     trendLabels,
     trendCurrent,
     trendPrevious,
+    trendMuseums,
     museumData,
     museumBreakdown,
     channelBreakdown,