fix(cache): fix trends chart data mismatch and remove redundant metrics card

- Align CacheTrends interface with API response (cachedRequests instead of hits/misses/hitRate)
- Update bar chart rendering to use cachedRequests field from getCacheTrend()
- Remove duplicate CacheStatsCard from cache overview (already in settings AI tab)
- Fix tooltip to use i18n translations instead of hardcoded English

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-opencode)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

src/app/(dashboard)/dashboard/cache/components/CacheTrends.tsx

@@ -5,9 +5,10 @@ import { useTranslations } from "next-intl";
 export interface CacheTrendPoint {
   timestamp: string;
   requests: number;
-  hits: number;
-  misses: number;
-  hitRate: number;
+  cachedRequests: number;
+  inputTokens: number;
+  cachedTokens: number;
+  cacheCreationTokens: number;
 }
 
 interface CacheTrendsProps {
@@ -27,7 +28,8 @@ export default function CacheTrends({
 
   const trendData: CacheTrendPoint[] = data ?? [];
   const maxRequests = trendData.length > 0 ? Math.max(...trendData.map((p) => p.requests), 1) : 1;
-  const peakHitRate = trendData.length > 0 ? Math.max(...trendData.map((p) => p.hitRate)) : null;
+  const maxCachedRequests =
+    trendData.length > 0 ? Math.max(...trendData.map((p) => p.cachedRequests), 0) : 0;
 
   return (
     <div
@@ -69,17 +71,21 @@ export default function CacheTrends({
         </div>
       ) : (
         <>
-          {peakHitRate !== null && (
+          {maxCachedRequests > 0 && (
             <div className="text-xs text-text-muted">
-              Peak hit rate:{" "}
-              <span className="font-medium text-foreground">{peakHitRate.toFixed(1)}</span>
+              Peak cached:{" "}
+              <span className="font-medium text-foreground">
+                {maxCachedRequests} / {maxRequests}
+              </span>
             </div>
           )}
           <div className="flex items-end gap-1 h-32">
             {trendData.map((point) => {
               const height = Math.max(4, (point.requests / maxRequests) * 100);
-              const hitHeight =
-                point.requests > 0 ? Math.max(2, (point.hits / point.requests) * height) : 0;
+              const cachedHeight =
+                point.requests > 0
+                  ? Math.max(2, (point.cachedRequests / point.requests) * height)
+                  : 0;
               const hour = new Date(point.timestamp).toLocaleTimeString([], {
                 hour: "2-digit",
                 minute: "2-digit",
@@ -92,16 +98,17 @@ export default function CacheTrends({
                   className="flex-1 flex flex-col items-center gap-1 group relative"
                 >
                   <div className="absolute bottom-full mb-1 hidden group-hover:block bg-surface-raised border border-border rounded px-2 py-1 text-xs whitespace-nowrap z-10">
-                    {hour}: {point.requests} requests, {point.hits} cached
+                    {hour}: {point.requests} {t("requests").toLowerCase()}, {point.cachedRequests}{" "}
+                    {t("cached").toLowerCase()}
                   </div>
                   <div className="w-full flex flex-col justify-end h-full gap-px">
                     <div
                       className="w-full bg-green-500/30 rounded-t"
-                      style={{ height: `${hitHeight}%` }}
+                      style={{ height: `${cachedHeight}%` }}
                     />
                     <div
                       className="w-full bg-text-muted/20 rounded-t"
-                      style={{ height: `${height - hitHeight}%` }}
+                      style={{ height: `${height - cachedHeight}%` }}
                     />
                   </div>
                   <span className="text-[10px] text-text-muted truncate w-full text-center">

src/app/(dashboard)/dashboard/cache/page.tsx

@@ -435,9 +435,6 @@ export default function CachePage() {
                 </Card>
               )}
 
-              {/* Prompt Cache Metrics (cumulative with reset) */}
-              <CacheStatsCard />
-
               {/* Cache Trend (24h) */}
               {trend.length > 0 && (
                 <Card>