feat(analysis): add 12-month summary row with total variation and accumulated inflation

apps/frontend/src/features/analysis/components/MonthlyVariationTable.tsx

@@ -54,6 +54,43 @@ function formatPrice(value: number): string {
   return `$${priceFormatter.format(value)}`;
 }
 
+function TotalVariation({
+  variation,
+  inflation,
+}: {
+  variation: number | null;
+  inflation: number | null;
+}) {
+  if (variation === null) {
+    return (
+      <span className="text-xs text-muted-foreground inline-flex items-center gap-1">
+        --
+      </span>
+    );
+  }
+
+  return (
+    <span
+      className={`text-xs font-medium inline-flex items-center gap-1 tabular-nums ${
+        inflation !== null
+          ? variation > inflation
+            ? "bg-emerald-100 text-emerald-700 dark:bg-emerald-900/30 dark:text-emerald-400 px-1.5 py-0.5 rounded"
+            : "bg-red-100 text-red-700 dark:bg-red-900/30 dark:text-red-400 px-1.5 py-0.5 rounded"
+          : variation >= 0
+            ? "text-emerald-500"
+            : "text-red-500"
+      }`}
+    >
+      {variation >= 0 ? (
+        <ArrowUp className="size-3" />
+      ) : (
+        <ArrowDown className="size-3" />
+      )}
+      {formatPct(variation)}
+    </span>
+  );
+}
+
 function VariationIndicator({
   variation,
   inflation,
@@ -205,6 +242,34 @@ export function MonthlyVariationTable() {
       .reverse();
   }, [monthlyData, inflationData]);
 
+  const summary = useMemo(() => {
+    if (rows.length < 2) return null;
+
+    const oldest = rows[rows.length - 1];
+    const newest = rows[0];
+
+    const totalVariation = (
+      first: number | null,
+      last: number | null,
+    ): number | null => {
+      if (first === null || last === null || first === 0) return null;
+      return ((last - first) / first) * 100;
+    };
+
+    const accumulatedInflation = rows.reduce<number | null>((acc, row) => {
+      if (row.inflation === null) return acc;
+      return (acc ?? 0) + row.inflation;
+    }, null);
+
+    return {
+      BELO: totalVariation(oldest.BELO.current, newest.BELO.current),
+      BLUE: totalVariation(oldest.BLUE.current, newest.BLUE.current),
+      BNA: totalVariation(oldest.BNA.current, newest.BNA.current),
+      inflation: accumulatedInflation,
+      period: `${oldest.label} – ${newest.label}`,
+    };
+  }, [rows]);
+
   const isLoading = monthlyLoading || inflationLoading;
 
   if (isLoading) {
@@ -279,6 +344,48 @@ export function MonthlyVariationTable() {
             </div>
           </div>
         ))}
+        {summary && (
+          <div className="rounded-lg border bg-muted/50 p-3 text-sm">
+            <div className="flex items-center justify-between mb-2">
+              <span className="font-semibold">Total 12 meses</span>
+              {summary.inflation !== null ? (
+                <span className="text-xs text-muted-foreground tabular-nums inline-flex items-center gap-1">
+                  <TrendingUp className="size-3" />
+                  {formatPct(summary.inflation)} inflación
+                </span>
+              ) : (
+                <span className="text-xs text-muted-foreground">
+                  Sin inflación
+                </span>
+              )}
+            </div>
+            <div className="grid grid-cols-3 gap-2">
+              <div>
+                <p className="text-[10px] text-muted-foreground mb-0.5">BELO</p>
+                <TotalVariation
+                  variation={summary.BELO}
+                  inflation={summary.inflation}
+                />
+              </div>
+              <div>
+                <p className="text-[10px] text-muted-foreground mb-0.5">Blue</p>
+                <TotalVariation
+                  variation={summary.BLUE}
+                  inflation={summary.inflation}
+                />
+              </div>
+              <div>
+                <p className="text-[10px] text-muted-foreground mb-0.5">
+                  Oficial
+                </p>
+                <TotalVariation
+                  variation={summary.BNA}
+                  inflation={summary.inflation}
+                />
+              </div>
+            </div>
+          </div>
+        )}
       </div>
 
       <div className="hidden overflow-x-auto rounded-lg border sm:block">
@@ -348,6 +455,38 @@ export function MonthlyVariationTable() {
                 </td>
               </tr>
             ))}
+            {summary && (
+              <tr className="border-t-2 bg-muted/50 font-medium">
+                <td className="px-3 py-2.5 text-xs">Total 12 meses</td>
+                <td className="px-3 py-2.5 text-right">
+                  <TotalVariation
+                    variation={summary.BELO}
+                    inflation={summary.inflation}
+                  />
+                </td>
+                <td className="px-3 py-2.5 text-right">
+                  <TotalVariation
+                    variation={summary.BLUE}
+                    inflation={summary.inflation}
+                  />
+                </td>
+                <td className="px-3 py-2.5 text-right">
+                  <TotalVariation
+                    variation={summary.BNA}
+                    inflation={summary.inflation}
+                  />
+                </td>
+                <td className="px-3 py-2.5 text-right">
+                  {summary.inflation !== null ? (
+                    <span className="text-xs font-medium tabular-nums">
+                      {formatPct(summary.inflation)}
+                    </span>
+                  ) : (
+                    <span className="text-xs text-muted-foreground">--</span>
+                  )}
+                </td>
+              </tr>
+            )}
           </tbody>
         </table>
       </div>