Mail list: hide a row the moment its archive/delete button is clicked

The hover actions waited for the server before the list reacted. The row now
leaves the list at once and the request runs behind it; a failed request puts
it back. In search the row greys out immediately instead, since it may still
match the query.

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

frontend/src/routes/MailLayout.tsx

@@ -90,6 +90,9 @@ export function MailLayout() {
   // Rows just archived/trashed/deleted from the list: greyed out and unclickable
   // for immediate feedback (search results don't always drop the row on refetch).
   const [dimmedIds, setDimmedIds] = useState<Set<string>>(new Set());
+  // Rows a hover action is moving out of the folder: gone from the list the
+  // moment the button is clicked, while the request runs behind it.
+  const [hiddenIds, setHiddenIds] = useState<Set<string>>(new Set());
   const toggleCheck = (id: string) =>
     setCheckedIds((prev) => {
       const next = new Set(prev);
@@ -223,8 +226,9 @@ export function MailLayout() {
     total = ordered.length;
     pageThreads = ordered.slice(page * PAGE_SIZE, page * PAGE_SIZE + PAGE_SIZE);
   } else {
-    pageThreads = threadsQuery.data?.threads ?? [];
+    const all = threadsQuery.data?.threads ?? [];
-    total = threadsQuery.data?.total ?? 0;
+    pageThreads = hiddenIds.size ? all.filter((th) => !hiddenIds.has(th.id)) : all;
+    total = Math.max(0, (threadsQuery.data?.total ?? 0) - (all.length - pageThreads.length));
   }
   const pageStart = page * PAGE_SIZE;
   const pageEnd = pageStart + pageThreads.length;
@@ -455,32 +459,38 @@ export function MailLayout() {
 
   // Per-thread actions for the mail-list hover buttons (act on a given id, not the
   // currently-open thread). Close the reading pane only if the acted thread is open.
-  const listAfterMove = (id: string) => {
+  //
-    // In a folder the refetch below removes the row (it left the folder's scope).
+  // The feedback is immediate and the request runs behind it. In a folder the
-    // In search the row may still match a global query, so grey it out for feedback.
+  // row is hidden straight away (it is leaving the folder's scope); in search it
-    if (searching) setDimmedIds((prev) => new Set(prev).add(id));
+  // may still match a global query, so it is greyed out instead. A failed
-    queryClient.invalidateQueries({ queryKey: ["threads"] });
+  // request puts the row back.
+  const listMove = async (id: string, action: (id: string) => Promise<unknown>) => {
+    const mark = searching ? setDimmedIds : setHiddenIds;
+    const unmark = () =>
+      mark((prev) => {
+        const next = new Set(prev);
+        next.delete(id);
+        return next;
+      });
+    mark((prev) => new Set(prev).add(id));
+    if (id === threadId) navigate("/mail");
+    try {
+      await action(id);
+    } catch {
+      unmark();
+      return;
+    }
     queryClient.invalidateQueries({ queryKey: ["search"] }); // keep search results in sync
     queryClient.invalidateQueries({ queryKey: ["quota"] });
     queryClient.invalidateQueries({ queryKey: ["folder-counts"] });
-    if (id === threadId) navigate("/mail");
+    // Once the list has refetched without the row, it no longer needs hiding.
-  };
+    await queryClient.invalidateQueries({ queryKey: ["threads"] });
-  const listArchive = async (id: string) => {
+    if (!searching) unmark();
-    await api.archiveThread(id);
-    listAfterMove(id);
-  };
-  const listTrash = async (id: string) => {
-    await api.trashThread(id);
-    listAfterMove(id);
-  };
-  const listRestore = async (id: string) => {
-    await api.restoreThread(id);
-    listAfterMove(id);
-  };
-  const listDeletePermanent = async (id: string) => {
-    await api.deleteThreadPermanent(id);
-    listAfterMove(id);
   };
+  const listArchive = (id: string) => listMove(id, api.archiveThread);
+  const listTrash = (id: string) => listMove(id, api.trashThread);
+  const listRestore = (id: string) => listMove(id, api.restoreThread);
+  const listDeletePermanent = (id: string) => listMove(id, api.deleteThreadPermanent);
   const listTogglePin = async (id: string, pinned: boolean) => {
     await api.threadFlags(id, pinned ? [] : ["\\Flagged"], pinned ? ["\\Flagged"] : []);
     queryClient.invalidateQueries({ queryKey: ["threads"] });