feat(stats): add episodes completed and anime completed to tracking snapshot

- Query watched videos count and anime with all episodes watched
- Display in overview tracking snapshot
- Remove efficiency section from trends

stats/src/components/overview/OverviewTab.tsx

@@ -40,7 +40,7 @@ export function OverviewTab() {
             No tracked card-add events in the current immersion DB yet. New cards mined after this fix will show here.
           </div>
         )}
-        <div className="grid grid-cols-2 sm:grid-cols-5 gap-3 text-sm">
+        <div className="grid grid-cols-2 sm:grid-cols-4 lg:grid-cols-7 gap-3 text-sm">
           <div className="rounded-lg bg-ctp-surface1/60 p-3">
             <div className="text-xs uppercase tracking-wide text-ctp-overlay2">Total Sessions</div>
             <div className="mt-1 text-xl font-semibold text-ctp-lavender">
@@ -71,6 +71,18 @@ export function OverviewTab() {
               {formatNumber(summary.totalTrackedCards)}
             </div>
           </div>
+          <div className="rounded-lg bg-ctp-surface1/60 p-3">
+            <div className="text-xs uppercase tracking-wide text-ctp-overlay2">Episodes Completed</div>
+            <div className="mt-1 text-xl font-semibold text-ctp-blue">
+              {formatNumber(summary.totalEpisodesWatched)}
+            </div>
+          </div>
+          <div className="rounded-lg bg-ctp-surface1/60 p-3">
+            <div className="text-xs uppercase tracking-wide text-ctp-overlay2">Anime Completed</div>
+            <div className="mt-1 text-xl font-semibold text-ctp-sapphire">
+              {formatNumber(summary.totalAnimeCompleted)}
+            </div>
+          </div>
         </div>
       </div>
 

stats/src/components/trends/TrendsTab.tsx

@@ -141,9 +141,6 @@ export function TrendsTab() {
           type="line"
         />
 
-        <SectionHeader>Efficiency</SectionHeader>
-        <TrendChart title="Cards per Hour" data={dashboard.cardsPerHour} color="#f5a97f" type="line" />
-
         <SectionHeader>Anime</SectionHeader>
         <StackedTrendChart title="Anime Progress (episodes)" data={animeProgress} />
         <StackedTrendChart title="Watch Time per Anime (min)" data={watchTimePerAnime} />