fix(dashboard): block duplicate quick-watch clicks until refetch and use logical end inset

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

apps/web/src/components/dashboard/continue-watching-card.tsx

@@ -116,7 +116,7 @@ export function ContinueWatchingCard({ item }: { item: ContinueWatchingItemProps
                 size="icon"
                 aria-label={quickWatchLabel}
                 disabled={pendingId === nextEpisode.id}
-                className="absolute top-2 right-2 rounded-full bg-black/50 text-white backdrop-blur-sm hover:bg-black/70"
+                className="absolute end-2 top-2 rounded-full bg-black/50 text-white backdrop-blur-sm hover:bg-black/70"
                 onClick={() =>
                   watchEpisode(
                     nextEpisode.id,

apps/web/src/components/dashboard/use-quick-watch.ts

@@ -1,5 +1,6 @@
 import { useLingui } from "@lingui/react/macro";
 import { useMutation, useQueryClient } from "@tanstack/react-query";
+import { useState } from "react";
 import { toast } from "sonner";
 
 import { getErrorMessage } from "@/lib/error-messages";
@@ -10,21 +11,25 @@ import { invalidateTrackingQueries } from "@/lib/orpc/invalidate";
 export function useQuickWatchEpisode() {
   const { t } = useLingui();
   const queryClient = useQueryClient();
-  const { mutate, variables, isPending } = useMutation(orpc.tracking.watch.mutationOptions());
-
-  function watchEpisode(episodeId: string, label: string) {
-    mutate(
-      { scope: "episode", ids: [episodeId] },
-      {
-        onSuccess: () => {
-          toast.success(t`Marked ${label} as watched`);
-          void invalidateTrackingQueries(queryClient);
-        },
-        onError: (err) => {
-          toast.error(getErrorMessage(err, t`Failed to mark episode`));
-        },
+  const [label, setLabel] = useState("");
+  // Handlers live on the hook-level options so the mutation stays pending until
+  // the tracking queries have refetched, which blocks duplicate clicks.
+  const { mutate, variables, isPending } = useMutation(
+    orpc.tracking.watch.mutationOptions({
+      onSuccess: async () => {
+        toast.success(t`Marked ${label} as watched`);
+        await invalidateTrackingQueries(queryClient);
       },
-    );
+      onError: (err) => {
+        toast.error(getErrorMessage(err, t`Failed to mark episode`));
+      },
+    }),
+  );
+
+  function watchEpisode(episodeId: string, episodeLabel: string) {
+    if (isPending) return;
+    setLabel(episodeLabel);
+    mutate({ scope: "episode", ids: [episodeId] });
   }
 
   const pendingId = isPending ? (variables?.ids?.[0] ?? null) : null;