fix(dashboard): show account email/name in Utilization Account Split cards (#10939)

Validado no worktree combinado: typecheck:core, changelog-integrity, complexity, cognitive-complexity, file-size, lint todos verdes. Fix de UX real e bem documentado (cards de Account Split mostravam UUID cru em vez de email/nome da conta). CI vermelho é o base-red já rastreado em #9985. Obrigado!

src/app/(dashboard)/dashboard/analytics/ProviderUtilizationTab.tsx

@@ -3,6 +3,7 @@
 import { useTranslations } from "next-intl";
 import { useCallback, useEffect, useMemo, useState } from "react";
 import { useProviderNodeMap, resolveProviderName } from "@/lib/display/useProviderNodeMap";
+import { getAccountDisplayName } from "@/lib/display/names";
 import dynamic from "next/dynamic";
 
 const ProviderCharts = dynamic(() => import("./components/ProviderCharts"), { ssr: false });
@@ -311,19 +312,39 @@ export default function ProviderUtilizationTab() {
               {latestPoints.map((point) => {
                 const isLow = point.remainingPct <= 20;
 
+                // For Account Split, parse "provider:connectionId" and resolve display name
+                const colonIdx = point.provider.indexOf(":");
+                const isConnectionKey = aggregateBy === "connection" && colonIdx !== -1;
+                const providerPart = isConnectionKey
+                  ? point.provider.slice(0, colonIdx)
+                  : point.provider;
+                const connectionId = isConnectionKey ? point.provider.slice(colonIdx + 1) : null;
+                const connMeta = connectionId ? data?.connectionMeta?.[connectionId] : null;
+                const cardTitle = isConnectionKey
+                  ? getAccountDisplayName({
+                      id: connectionId ?? undefined,
+                      email: connMeta?.email,
+                      name: connMeta?.name,
+                      displayName: connMeta?.displayName,
+                    })
+                  : resolveProviderName(point.provider, nodeMap);
+                const cardSubtitle = isConnectionKey
+                  ? `${providerPart} · account ${(connectionId ?? "").slice(0, 8)}…`
+                  : t("providerUtilizationLatestSnapshot");
+
                 return (
                   <Card.Section key={point.provider} className="flex h-full flex-col gap-4">
                     <div className="flex items-start justify-between gap-3">
                       <div className="flex items-center gap-3">
                         <div className="flex h-11 w-11 items-center justify-center rounded-xl border border-black/5 bg-surface text-text-main dark:border-white/5">
-                          <ProviderIcon providerId={point.provider} size={22} />
+                          <ProviderIcon providerId={providerPart} size={22} />
                         </div>
                         <div>
                           <p className="text-sm font-semibold text-text-main">
-                            {resolveProviderName(point.provider, nodeMap)}
+                            {cardTitle}
                           </p>
                           <p className="text-xs text-text-muted">
-                            {t("providerUtilizationLatestSnapshot")}
+                            {cardSubtitle}
                           </p>
                         </div>
                       </div>

src/app/api/usage/utilization/route.ts

@@ -1,6 +1,11 @@
 import { NextResponse } from "next/server";
 import { getAggregatedSnapshots } from "@/lib/db/quotaSnapshots";
-import type { ProviderUtilizationResponse, UtilizationTimeRange } from "@/shared/types/utilization";
+import { getConnection } from "@/lib/db/connections";
+import type {
+  ProviderUtilizationResponse,
+  UtilizationTimeRange,
+  ConnectionMetaEntry,
+} from "@/shared/types/utilization";
 import { BUCKET_SIZES } from "@/shared/types/utilization";
 
 const VALID_RANGES: UtilizationTimeRange[] = ["1h", "24h", "7d", "30d"];
@@ -55,11 +60,28 @@ export async function GET(request: Request) {
 
     const providers = Array.from(new Set(data.map((d) => d.provider)));
 
+    let connectionMeta: Record<string, ConnectionMetaEntry> | undefined;
+    if (aggregateBy === "connection") {
+      const uniqueConnectionIds = new Set(
+        data.map((d) => d.provider.split(":").slice(1).join(":")).filter(Boolean)
+      );
+      connectionMeta = {};
+      for (const cid of uniqueConnectionIds) {
+        const conn = getConnection(cid);
+        connectionMeta[cid] = {
+          email: conn?.email ?? null,
+          name: conn?.name ?? null,
+          displayName: conn?.displayName ?? null,
+        };
+      }
+    }
+
     const response: ProviderUtilizationResponse = {
       timeRange: range,
       bucketSizeMinutes: bucketMinutes,
       providers,
       data,
+      connectionMeta,
     };
 
     return NextResponse.json(response);

src/shared/types/utilization.ts

@@ -19,11 +19,18 @@ export interface ProviderUtilizationPoint {
   windowKey: string;
 }
 
+export interface ConnectionMetaEntry {
+  email: string | null;
+  name: string | null;
+  displayName: string | null;
+}
+
 export interface ProviderUtilizationResponse {
   timeRange: "1h" | "24h" | "7d" | "30d";
   bucketSizeMinutes: number;
   providers: string[];
   data: ProviderUtilizationPoint[];
+  connectionMeta?: Record<string, ConnectionMetaEntry>;
 }
 
 export interface ComboHealthMetrics {