feat(managers): paginate the card layout + its top scroll-fade

UAT round 3 feedback on the card layout:
- Add a pager + "Cards per page" to the card view (it infinitely-scrolled before).
  Extracted the pager cluster out of DataTable into a reusable Pager component
  (the table now renders it too — no behaviour change); the card view slices the
  sorted rows and drives its own per-account page size (subscribed + discovery).
- Restore the top edge-fade in the card layout. The channels page registers
  fadeTop:false for its sticky-header table; the card layout has no sticky header,
  so App now re-enables the top fade when the channel layout is cards.

frontend/src/App.tsx

@@ -27,6 +27,7 @@ import {
 } from "./lib/storage";
 import { useNavigation, useNavigationActions } from "./components/NavigationProvider";
 import { useFeedFilters, useFeedFiltersActions } from "./components/FeedFiltersProvider";
+import { useChannels } from "./components/ChannelsProvider";
 import { useFeedView, useFeedViewActions } from "./components/FeedViewProvider";
 import { moduleDef } from "./lib/modules";
 import { PAGE_CONTENT, PAGE_RAIL } from "./components/moduleRegistry";
@@ -62,6 +63,9 @@ export default function App() {
   // handlers that mutate the feed view (onShowInFeed, tag-click, the feed scrollKey).
   const filters = useFeedFilters();
   const { setFilters } = useFeedFiltersActions();
+  // The channel manager turns its top fade OFF for the table (its sticky header sits at the scroller
+  // top) but wants it ON for the card layout (no sticky header) — so the fade depends on the layout.
+  const { layout: channelLayout } = useChannels();
   // The feed's view mode (card/row/tile density) lives in FeedViewProvider — server-synced, shared
   // by the feed page and the channel page. App reads it only to hand to <Feed>/<ChannelPage>.
   const view = useFeedView();
@@ -387,7 +391,9 @@ export default function App() {
         ) : (
           <PageShell
             scrollKey={normalScrollKey}
-            fadeTop={fadeTop ?? true}
+            // Channels: the registry disables the top fade for its sticky-header table, but the card
+            // layout has no sticky header, so re-enable it there.
+            fadeTop={activePage === "channels" ? channelLayout === "cards" : fadeTop ?? true}
             header={<Header me={meQuery.data!} onYtSearch={enterYtSearch} />}
             banners={
               <>

frontend/src/components/ChannelDiscovery.tsx

@@ -15,6 +15,7 @@ import AboutCell from "./AboutCell";
 import DataTable, { type Column } from "./DataTable";
 import ChannelLayoutGrid from "./ChannelLayoutGrid";
 import ColumnSortControl from "./ColumnSortControl";
+import Pager from "./Pager";
 import { PageToolbar } from "./PageShell";
 import { useConfirm } from "./ConfirmProvider";
 import { useChannels } from "./ChannelsProvider";
@@ -47,6 +48,9 @@ export default function ChannelDiscovery({
     setSortState(s);
     writeAccount(LS.channelDiscoverySort, s);
   };
+  // Card layout pagination (its own; the table keeps its rows-per-page inside DataTable).
+  const [cardSize, setCardSize] = useState(() => readAccount<number>(LS.channelDiscoveryCardSize, 25));
+  const [cardPage, setCardPage] = useState(0);
 
   const query = useQuery({
     queryKey: ["discovered-channels"],
@@ -180,14 +184,37 @@ export default function ChannelDiscovery({
     },
   ];
 
+  // Card layout paginates like the table (slice the sorted rows; the Pager reports changes).
+  const sortedRows = sortRows(rows, columns, sort);
+  const cardTotalPages = cardSize <= 0 ? 1 : Math.max(1, Math.ceil(sortedRows.length / cardSize));
+  const cardSafePage = Math.min(cardPage, cardTotalPages - 1);
+  const pagedRows =
+    cardSize <= 0
+      ? sortedRows
+      : sortedRows.slice(cardSafePage * cardSize, cardSafePage * cardSize + cardSize);
+
   return (
     <>
       {/* Intro + the table controls are fixed chrome; only the table rows scroll (sticky header). */}
       <PageToolbar>
         <div className="px-4 pt-3 max-w-[96rem] mx-auto flex items-start justify-between gap-4">
           <p className="text-xs text-muted leading-relaxed">{t("channels.discovery.intro")}</p>
-          {/* Cards has no column headers, so a dropdown drives the sort (table uses the headers). */}
+          {/* Cards has no column headers, so a dropdown drives the sort + a pager (table uses its own). */}
           {layout === "cards" && (
+            <div className="flex items-center gap-3 shrink-0">
+              <Pager
+                page={cardSafePage}
+                size={cardSize}
+                total={sortedRows.length}
+                pageSizeOptions={[10, 25, 50, 100]}
+                onPageChange={setCardPage}
+                onSizeChange={(s) => {
+                  setCardSize(s);
+                  writeAccount(LS.channelDiscoveryCardSize, s);
+                  setCardPage(0);
+                }}
+                sizeLabel={t("channels.cardsPerPage")}
+              />
               <ColumnSortControl
                 columns={columns}
                 sort={sort}
@@ -197,6 +224,7 @@ export default function ChannelDiscovery({
                 ascLabel={t("channels.sort.asc")}
                 descLabel={t("channels.sort.desc")}
               />
+            </div>
           )}
         </div>
       </PageToolbar>
@@ -218,7 +246,7 @@ export default function ChannelDiscovery({
           />
         ) : (
           <ChannelLayoutGrid
-            rows={sortRows(rows, columns, sort)}
+            rows={pagedRows}
             columns={columns}
             rowKey={(c) => c.id}
             aboutKey="about"

frontend/src/components/Channels.tsx

@@ -19,7 +19,7 @@ import {
 } from "lucide-react";
 import { api, type ManagedChannel, type Tag } from "../lib/api";
 import { notifyYouTubeActionError } from "../lib/youtubeErrors";
-import { accountKey, LS } from "../lib/storage";
+import { accountKey, LS, readAccount, writeAccount } from "../lib/storage";
 import { useDismiss } from "../lib/useDismiss";
 import { useScrollFade } from "../lib/useScrollFade";
 import { formatEta, formatTotalHours, relativeTime } from "../lib/format";
@@ -30,6 +30,7 @@ import DataTable, { type Column } from "./DataTable";
 import ChannelLayoutGrid from "./ChannelLayoutGrid";
 import ViewSwitcher, { type ViewOption } from "./ViewSwitcher";
 import ColumnSortControl from "./ColumnSortControl";
+import Pager from "./Pager";
 import { CHANNEL_LAYOUTS, type ChannelLayout } from "../lib/channelLayout";
 import { sortRows } from "../lib/columnSort";
 import { PageToolbar } from "./PageShell";
@@ -60,6 +61,10 @@ const LAYOUT_ICON: Record<ChannelLayout, typeof Table> = {
   cards: LayoutGrid,
 };
 
+// Cards-per-page options (mirrors the DataTable default); the card grid gets a pager like the table.
+const CARD_PAGE_SIZES = [10, 25, 50, 100];
+const CARD_SIZE_DEFAULT = 25;
+
 export default function Channels() {
   const me = useMe();
   const canWrite = me.can_write;
@@ -210,6 +215,10 @@ export default function Channels() {
   // Channel-name search (from the shared top SearchBar, via props) + tag-chip filtering, applied
   // client-side over the status-filtered list.
   const [tagFilter, setTagFilter] = useState<number[]>([]);
+  // Card layout pagination (the table keeps its own inside DataTable). Size persists per account;
+  // the page is transient.
+  const [cardSize, setCardSize] = useState(() => readAccount<number>(LS.channelCardSize, CARD_SIZE_DEFAULT));
+  const [cardPage, setCardPage] = useState(0);
   // A focus-channel intent (header "without full history" / tag manager) seeds the search box.
   useEffect(() => {
     if (focusChannelName) setSearch(focusChannelName);
@@ -513,6 +522,30 @@ export default function Channels() {
       descLabel={t("channels.sort.desc")}
     />
   );
+  // The card layout paginates like the table (a page of cards + a pager), rather than one long
+  // infinite scroll. Slice the sorted rows; the Pager reports page/size changes.
+  const sortedChannels = sortRows(visibleChannels, columns, sort);
+  const cardTotalPages = cardSize <= 0 ? 1 : Math.max(1, Math.ceil(sortedChannels.length / cardSize));
+  const cardSafePage = Math.min(cardPage, cardTotalPages - 1);
+  const pagedCards =
+    cardSize <= 0
+      ? sortedChannels
+      : sortedChannels.slice(cardSafePage * cardSize, cardSafePage * cardSize + cardSize);
+  const cardPager = (
+    <Pager
+      page={cardSafePage}
+      size={cardSize}
+      total={sortedChannels.length}
+      pageSizeOptions={CARD_PAGE_SIZES}
+      onPageChange={setCardPage}
+      onSizeChange={(s) => {
+        setCardSize(s);
+        writeAccount(LS.channelCardSize, s);
+        setCardPage(0);
+      }}
+      sizeLabel={t("channels.cardsPerPage")}
+    />
+  );
 
   const tabs = (
     <div className="px-4 pt-4 max-w-[96rem] mx-auto flex items-center justify-between gap-4 flex-wrap">
@@ -596,10 +629,13 @@ export default function Channels() {
       </div>
     </div>
     )}
-    {/* In table mode the status chips ride in DataTable's own in-band controls row (beside the
-        pager). The card/row layouts have no such row, so surface the same chips here. */}
-    {view === "subscribed" && layout !== "table" && (
-      <div className="px-4 pb-2 max-w-[96rem] mx-auto">{statusChips}</div>
+    {/* In table mode the status chips + pager ride in DataTable's own in-band controls row. The card
+        layout has no such row, so surface the same status chips (left) and its pager (right) here. */}
+    {view === "subscribed" && layout === "cards" && (
+      <div className="px-4 pb-2 max-w-[96rem] mx-auto flex items-center justify-between gap-3 flex-wrap">
+        {statusChips}
+        {cardPager}
+      </div>
     )}
     </PageToolbar>
     {tagManagerOpen && (
@@ -675,7 +711,7 @@ export default function Channels() {
           />
         ) : (
           <ChannelLayoutGrid
-            rows={sortRows(visibleChannels, columns, sort)}
+            rows={pagedCards}
             columns={columns}
             rowKey={(c) => c.id}
             leadKey="priority"

frontend/src/components/DataTable.tsx

@@ -1,9 +1,10 @@
 import { useEffect, useRef, useState, type ReactNode } from "react";
 import { useTranslation } from "react-i18next";
-import { ArrowDown, ArrowUp, ChevronLeft, ChevronRight, ListFilter, X } from "lucide-react";
+import { ArrowDown, ArrowUp, ListFilter, X } from "lucide-react";
 import { useDismiss } from "../lib/useDismiss";
 import { useScrollFade } from "../lib/useScrollFade";
 import { sortRows, cycleSort, type SortState } from "../lib/columnSort";
+import Pager from "./Pager";
 import { PageToolbar } from "./PageShell";
 
 // A reusable, client-side data table: per-column sort + filter (in the header) + pagination,
@@ -132,8 +133,6 @@ export default function DataTable<T>({
   const [page, setPage] = useState(initial.page);
   const [size, setSize] = useState(initial.size ?? pageSize);
   const [openFilter, setOpenFilter] = useState<string | null>(null);
-  // Local text for the editable "jump to page" box (committed on Enter/blur).
-  const [pageInput, setPageInput] = useState("1");
   const popRef = useRef<HTMLDivElement | null>(null);
 
   useEffect(() => {
@@ -181,13 +180,6 @@ export default function DataTable<T>({
   const safePage = Math.min(page, totalPages - 1);
   const paged = allRows ? sorted : sorted.slice(safePage * size, safePage * size + size);
 
-  useEffect(() => setPageInput(String(safePage + 1)), [safePage]);
-  function commitPageInput() {
-    const n = parseInt(pageInput, 10);
-    if (!isNaN(n)) setPage(Math.min(totalPages - 1, Math.max(0, n - 1)));
-    else setPageInput(String(safePage + 1));
-  }
-
   function toggleSort(key: string) {
     const next = cycleSort(sort, key);
     if (controlledSort) onSortChange!(next);
@@ -291,66 +283,20 @@ export default function DataTable<T>({
   // The pager + rows-per-page cluster on its own, so it can be rendered a second time at the bottom
   // (controlsPosition "both") WITHOUT repeating the leading controls (e.g. the status chips) — those
   // are header controls and belong only at the top.
-  const pagerNode =
-    totalPages > 1 || sorted.length > 0 ? (
-      <div className="flex items-center gap-3 flex-wrap">
-        {totalPages > 1 && (
-          <div className="flex items-center gap-2">
-            <button
-              onClick={() => setPage((p) => Math.max(0, p - 1))}
-              disabled={safePage === 0}
-              className="glass-card glass-hover flex items-center gap-1 px-3 py-1.5 rounded-lg disabled:opacity-40 transition"
-            >
-              <ChevronLeft className="w-4 h-4" />
-              {t("datatable.pager.prev")}
-            </button>
-            <span className="text-muted flex items-center gap-1.5">
-              {t("datatable.pager.pageLabel")}
-              <input
-                type="number"
-                min={1}
-                max={totalPages}
-                value={pageInput}
-                onChange={(e) => setPageInput(e.target.value)}
-                onBlur={commitPageInput}
-                onKeyDown={(e) => e.key === "Enter" && commitPageInput()}
-                aria-label={t("datatable.pager.pageLabel")}
-                className="w-14 bg-card border border-border rounded-md px-1.5 py-1 text-xs text-center tabular-nums outline-none focus:border-accent"
-              />
-              {t("datatable.pager.ofTotal", { total: totalPages })}
-            </span>
-            <button
-              onClick={() => setPage((p) => Math.min(totalPages - 1, p + 1))}
-              disabled={safePage >= totalPages - 1}
-              className="glass-card glass-hover flex items-center gap-1 px-3 py-1.5 rounded-lg disabled:opacity-40 transition"
-            >
-              {t("datatable.pager.next")}
-              <ChevronRight className="w-4 h-4" />
-            </button>
-          </div>
-        )}
-        {sorted.length > 0 && (
-          <label className="flex items-center gap-2 text-muted">
-            {t("datatable.rowsPerPage")}
-            <select
-              value={size}
-              onChange={(e) => {
-                setSize(Number(e.target.value));
+  const pagerNode = (
+    <Pager
+      page={safePage}
+      size={size}
+      total={sorted.length}
+      pageSizeOptions={pageSizeOptions}
+      onPageChange={setPage}
+      onSizeChange={(s) => {
+        setSize(s);
         setPage(0);
       }}
-              className="bg-card border border-border rounded-md px-1.5 py-1 text-xs outline-none focus:border-accent"
-            >
-              {pageSizeOptions.map((n) => (
-                <option key={n} value={n}>
-                  {n}
-                </option>
-              ))}
-              <option value={0}>{t("datatable.all")}</option>
-            </select>
-          </label>
-        )}
-      </div>
-    ) : null;
+      sizeLabel={t("datatable.rowsPerPage")}
+    />
+  );
 
   const controls =
     controlsLeading != null || pagerNode ? (

frontend/src/components/Pager.tsx

@@ -0,0 +1,100 @@
+import { useEffect, useState } from "react";
+import { useTranslation } from "react-i18next";
+import { ChevronLeft, ChevronRight } from "lucide-react";
+
+// The Prev / page-input / Next + "N per page" cluster, lifted out of DataTable so a non-table view
+// (the channel manager's card layout) can paginate the same way. Controlled: the caller owns page +
+// size and slices its own rows; this only renders the controls and reports changes. `sizeLabel` lets
+// the caller say "Rows per page" or "Cards per page". Returns null when there's nothing to page.
+export default function Pager({
+  page,
+  size,
+  total,
+  pageSizeOptions,
+  onPageChange,
+  onSizeChange,
+  sizeLabel,
+}: {
+  /** Current page (0-based). */
+  page: number;
+  /** Page size; `<= 0` means "All" (one page). */
+  size: number;
+  /** Total item count across all pages. */
+  total: number;
+  pageSizeOptions: number[];
+  onPageChange: (page: number) => void;
+  onSizeChange: (size: number) => void;
+  sizeLabel: string;
+}) {
+  const { t } = useTranslation();
+  const allRows = size <= 0;
+  const totalPages = allRows ? 1 : Math.max(1, Math.ceil(total / size));
+  const safePage = Math.min(page, totalPages - 1);
+
+  // Local text for the editable "jump to page" box (committed on Enter/blur).
+  const [pageInput, setPageInput] = useState(String(safePage + 1));
+  useEffect(() => setPageInput(String(safePage + 1)), [safePage]);
+  function commitPageInput() {
+    const n = parseInt(pageInput, 10);
+    if (!isNaN(n)) onPageChange(Math.min(totalPages - 1, Math.max(0, n - 1)));
+    else setPageInput(String(safePage + 1));
+  }
+
+  if (!(totalPages > 1 || total > 0)) return null;
+  return (
+    <div className="flex items-center gap-3 flex-wrap">
+      {totalPages > 1 && (
+        <div className="flex items-center gap-2">
+          <button
+            onClick={() => onPageChange(Math.max(0, safePage - 1))}
+            disabled={safePage === 0}
+            className="glass-card glass-hover flex items-center gap-1 px-3 py-1.5 rounded-lg disabled:opacity-40 transition"
+          >
+            <ChevronLeft className="w-4 h-4" />
+            {t("datatable.pager.prev")}
+          </button>
+          <span className="text-muted flex items-center gap-1.5">
+            {t("datatable.pager.pageLabel")}
+            <input
+              type="number"
+              min={1}
+              max={totalPages}
+              value={pageInput}
+              onChange={(e) => setPageInput(e.target.value)}
+              onBlur={commitPageInput}
+              onKeyDown={(e) => e.key === "Enter" && commitPageInput()}
+              aria-label={t("datatable.pager.pageLabel")}
+              className="w-14 bg-card border border-border rounded-md px-1.5 py-1 text-xs text-center tabular-nums outline-none focus:border-accent"
+            />
+            {t("datatable.pager.ofTotal", { total: totalPages })}
+          </span>
+          <button
+            onClick={() => onPageChange(Math.min(totalPages - 1, safePage + 1))}
+            disabled={safePage >= totalPages - 1}
+            className="glass-card glass-hover flex items-center gap-1 px-3 py-1.5 rounded-lg disabled:opacity-40 transition"
+          >
+            {t("datatable.pager.next")}
+            <ChevronRight className="w-4 h-4" />
+          </button>
+        </div>
+      )}
+      {total > 0 && (
+        <label className="flex items-center gap-2 text-muted">
+          {sizeLabel}
+          <select
+            value={size}
+            onChange={(e) => onSizeChange(Number(e.target.value))}
+            className="bg-card border border-border rounded-md px-1.5 py-1 text-xs outline-none focus:border-accent"
+          >
+            {pageSizeOptions.map((n) => (
+              <option key={n} value={n}>
+                {n}
+              </option>
+            ))}
+            <option value={0}>{t("datatable.all")}</option>
+          </select>
+        </label>
+      )}
+    </div>
+  );
+}

frontend/src/i18n/locales/en/channels.json

@@ -19,6 +19,7 @@
     "asc": "Ascending",
     "desc": "Descending"
   },
+  "cardsPerPage": "Cards per page",
   "discovery": {
     "intro": "Channels that appear in your playlists but that you don't subscribe to. Subscribe to follow them — their new uploads will start showing in your feed (subscribing costs a little YouTube quota; existing videos aren't re-fetched).",
     "loading": "Finding channels…",

frontend/src/i18n/locales/hu/channels.json

@@ -19,6 +19,7 @@
     "asc": "Növekvő",
     "desc": "Csökkenő"
   },
+  "cardsPerPage": "Kártya / oldal",
   "discovery": {
     "intro": "Csatornák, amelyek megjelennek a lejátszási listáidban, de még nem iratkoztál fel rájuk. Iratkozz fel, hogy kövesd őket — az új feltöltéseik megjelennek a hírfolyamodban (a feliratkozás kevés YouTube-kvótát használ; a meglévő videókat nem tölti le újra).",
     "loading": "Csatornák keresése…",

frontend/src/lib/storage.ts

@@ -29,6 +29,9 @@ export const LS = {
   // The manager's sort, lifted out of the table so the card layout shares it (per-account, per-tab).
   channelSort: "siftlode.channelSort",
   channelDiscoverySort: "siftlode.channelDiscoverySort",
+  // Cards-per-page for the card layout (the table keeps its own rows-per-page in its persist blob).
+  channelCardSize: "siftlode.channelCardSize",
+  channelDiscoveryCardSize: "siftlode.channelDiscoveryCardSize",
   channelsTable: "siftlode.channelsTable",
   channelDiscoveryTable: "siftlode.channelDiscoveryTable",
   settingsTab: "siftlode.settingsTab",