feat(search): live YouTube search UI

Surface live YouTube search in the existing feed, triggered explicitly so the
expensive API call is never per-keystroke.

- Header: the search box still filters the local catalog as you type; Enter or a
  YouTube button escalates the term to a live search (hidden for the demo account).
- Feed: a dedicated infinite query renders results in the same VirtualFeed cards +
  in-app player, under a banner with a back button and a quota note. No auto-paginate
  (each page spends 100 units) — an explicit 'Load more (uses quota)' button instead;
  quota/limit errors (incl. 429) shown inline. The empty local feed offers a
  'Search YouTube for <q>' CTA.
- Library: a 'Search-discovered' toggle reveals search-ingested videos (hidden by
  default); sent as exclude_search_discovered.
- Admin: search_daily_limit_per_user config field; new videos_search quota label.
- All new strings translated in HU/EN/DE.

frontend/src/App.tsx

@@ -122,6 +122,9 @@ export default function App() {
   const saveMsgTimer = useRef<number | undefined>(undefined);
   const [sidebarLayout, setSidebarLayoutState] = useState<SidebarLayout>(loadLayout);
   const [page, setPageState] = useState<Page>(loadInitialPage);
+  // Live YouTube search term (null = normal feed). Ephemeral: not persisted and not in the URL,
+  // so a reload returns to the normal feed (a search spends quota, so we never auto-replay it).
+  const [ytSearch, setYtSearch] = useState<string | null>(null);
   const [wizardOpen, setWizardOpen] = useState(false);
   // Channel status chip, persisted so a reload (F5) keeps it; clamp a stale value at render.
   const [channelFilterRaw, setChannelFilter] = usePersistedState(LS.channelFilter, "all");
@@ -153,6 +156,8 @@ export default function App() {
   };
   useEffect(() => {
     if (page !== "channels") setFocusChannelName(null);
+    // Leaving the feed ends any live YouTube search, so coming back shows the normal feed.
+    if (page !== "feed") setYtSearch(null);
   }, [page]);
 
   function openReleaseNotes(highlight?: string) {
@@ -500,6 +505,7 @@ export default function App() {
           filters={filters}
           setFilters={setFilters}
           page={page}
+          onYtSearch={setYtSearch}
           onGoToFullHistory={() => {
             setChannelFilter("needs_full");
             setChannelsView("subscribed"); // the status filter applies to the subscriptions tab
@@ -572,6 +578,8 @@ export default function App() {
               canRead={meQuery.data!.can_read}
               isDemo={meQuery.data!.is_demo}
               onOpenWizard={() => setWizardOpen(true)}
+              ytSearch={ytSearch}
+              setYtSearch={setYtSearch}
             />
           )}
           </main>

frontend/src/components/Feed.tsx

@@ -1,8 +1,8 @@
 import { useCallback, useEffect, useRef, useState } from "react";
 import { useTranslation } from "react-i18next";
 import { useInfiniteQuery, useQuery, useQueryClient } from "@tanstack/react-query";
-import { ArrowDown, ArrowUp, RefreshCw } from "lucide-react";
-import { api, type FeedFilters, type Video } from "../lib/api";
+import { ArrowDown, ArrowUp, ArrowLeft, RefreshCw, Youtube } from "lucide-react";
+import { api, HttpError, type FeedFilters, type Video } from "../lib/api";
 import i18n from "../i18n";
 import { notify, resolveVideo } from "../lib/notifications";
 import VirtualFeed from "./VirtualFeed";
@@ -70,6 +70,8 @@ export default function Feed({
   canRead,
   isDemo = false,
   onOpenWizard,
+  ytSearch,
+  setYtSearch,
 }: {
   filters: FeedFilters;
   setFilters: (f: FeedFilters) => void;
@@ -77,6 +79,10 @@ export default function Feed({
   canRead: boolean;
   isDemo?: boolean;
   onOpenWizard: () => void;
+  // Live YouTube search: the active search term (null = normal feed), and its setter so the
+  // empty-state CTA / "back to feed" can toggle it. Search affordances are hidden for demo.
+  ytSearch: string | null;
+  setYtSearch: (q: string | null) => void;
 }) {
   const { t } = useTranslation();
   const [overrides, setOverrides] = useState<Record<string, string>>({});
@@ -92,11 +98,27 @@ export default function Feed({
     []
   );
 
+  const ytActive = !!ytSearch;
+
   const query = useInfiniteQuery({
     queryKey: ["feed", filters],
     queryFn: ({ pageParam }) => api.feed(filters, pageParam as string | null, PAGE),
     initialPageParam: null as string | null,
     getNextPageParam: (last) => last.next_cursor ?? undefined,
+    enabled: !ytActive, // don't load the normal feed while showing live YouTube results
+  });
+
+  // Live YouTube search results. Each page spends 100 quota units, so we never auto-paginate
+  // on scroll — the user pulls more with an explicit button. retry:false so a 429 (quota/limit)
+  // surfaces at once for inline display. staleTime keeps a revisited search from re-spending.
+  const ytQuery = useInfiniteQuery({
+    queryKey: ["yt-search", ytSearch],
+    queryFn: ({ pageParam }) => api.searchYoutube(ytSearch as string, pageParam as string | null),
+    initialPageParam: null as string | null,
+    getNextPageParam: (last) => last.next_cursor ?? undefined,
+    enabled: ytActive,
+    staleTime: 5 * 60_000,
+    retry: false,
   });
 
   // Drop optimistic status overrides when filters change OR fresh server data
@@ -116,6 +138,7 @@ export default function Feed({
     queryKey: ["feed-count", filters],
     queryFn: () => api.feedCount(filters),
     staleTime: 30_000,
+    enabled: !ytActive,
   });
 
   const { hasNextPage, isFetchingNextPage, fetchNextPage } = query;
@@ -232,6 +255,86 @@ export default function Feed({
     .map((v) => (savedOverrides[v.id] !== undefined ? { ...v, saved: savedOverrides[v.id] } : v))
     .filter((v) => matchesView(v.status, filters.show));
 
+  // --- Live YouTube search mode -------------------------------------------------------------
+  // A separate data source rendered in the same cards/player. No watch-state view filter (the
+  // user explicitly searched, so show everything) and no auto-pagination (each page costs quota).
+  if (ytActive) {
+    const ytLoaded: Video[] = (ytQuery.data?.pages ?? []).flatMap((p) => p.items);
+    loadedRef.current = ytLoaded;
+    const ytItems: Video[] = ytLoaded
+      .map((v) => (overrides[v.id] ? { ...v, status: overrides[v.id] } : v))
+      .map((v) => (savedOverrides[v.id] !== undefined ? { ...v, saved: savedOverrides[v.id] } : v));
+    const ytError =
+      ytQuery.error instanceof HttpError
+        ? ytQuery.error.detail || t("feed.yt.error")
+        : ytQuery.isError
+          ? t("feed.yt.error")
+          : null;
+
+    return (
+      <div className="p-4">
+        <div className="flex items-center gap-2 flex-wrap pb-3 mb-1 border-b border-border">
+          <button
+            onClick={() => setYtSearch(null)}
+            className="inline-flex items-center gap-1.5 text-sm text-muted hover:text-accent transition shrink-0"
+          >
+            <ArrowLeft className="w-4 h-4" />
+            {t("feed.yt.back")}
+          </button>
+          <span className="mx-1 h-5 w-px bg-border" aria-hidden="true" />
+          <Youtube className="w-4 h-4 text-accent shrink-0" />
+          <span className="text-sm font-semibold truncate">
+            {t("feed.yt.resultsFor", { query: ytSearch })}
+          </span>
+          <span className="text-xs text-muted">{t("feed.yt.quotaNote")}</span>
+        </div>
+
+        {ytQuery.isLoading ? (
+          <div className="py-16 text-center text-muted">{t("feed.yt.searching")}</div>
+        ) : ytError ? (
+          <div className="py-16 text-center text-muted max-w-md mx-auto">{ytError}</div>
+        ) : ytItems.length === 0 ? (
+          <div className="py-16 text-center text-muted">{t("feed.yt.noResults")}</div>
+        ) : (
+          <>
+            <VirtualFeed
+              items={ytItems}
+              view={view}
+              onState={onState}
+              onToggleSave={onToggleSave}
+              onChannelFilter={onChannelFilter}
+              onResetState={onResetState}
+              onOpen={openVideo}
+              hasNextPage={false}
+              isFetchingNextPage={false}
+              fetchNextPage={() => {}}
+            />
+            {ytQuery.hasNextPage && (
+              <div className="text-center pt-4">
+                <button
+                  onClick={() => ytQuery.fetchNextPage()}
+                  disabled={ytQuery.isFetchingNextPage}
+                  className="inline-flex items-center gap-2 px-4 py-2 rounded-xl border border-border bg-card text-sm font-medium hover:border-accent hover:text-accent disabled:opacity-50 transition"
+                >
+                  {ytQuery.isFetchingNextPage ? t("feed.loadingMore") : t("feed.yt.loadMore")}
+                </button>
+              </div>
+            )}
+          </>
+        )}
+
+        {activeVideo && (
+          <PlayerModal
+            video={activeVideo.video}
+            startAt={activeVideo.startAt}
+            onClose={() => setActiveVideo(null)}
+            onState={onState}
+          />
+        )}
+      </div>
+    );
+  }
+
   if (query.isLoading) return <div className="p-8 text-muted">{t("feed.loading")}</div>;
   if (query.isError) return <div className="p-8 text-muted">{t("feed.loadError")}</div>;
   // Empty "my" feed with no YouTube access. The shared demo account can never connect
@@ -311,6 +414,25 @@ export default function Feed({
             </button>
           );
         })}
+        {filters.scope === "all" && (
+          <>
+            <span className="mx-1 h-5 w-px bg-border" aria-hidden="true" />
+            <button
+              onClick={() =>
+                setFilters({ ...filters, showSearchDiscovered: !filters.showSearchDiscovered })
+              }
+              aria-pressed={!!filters.showSearchDiscovered}
+              title={t("feed.searchDiscoveredTip")}
+              className={`text-xs px-3 py-1.5 rounded-full border transition ${
+                filters.showSearchDiscovered
+                  ? "bg-accent text-accent-fg border-accent"
+                  : "border-border text-muted hover:text-fg hover:border-accent"
+              }`}
+            >
+              {t("feed.searchDiscovered")}
+            </button>
+          </>
+        )}
       </div>
       <div className="flex items-center gap-2 border-t border-border pt-2.5">
         <span className="text-sm text-muted">
@@ -372,7 +494,18 @@ export default function Feed({
     <div className="p-4">
       {toolbar}
       {items.length === 0 ? (
-        <div className="py-16 text-center text-muted">{t("feed.noMatches")}</div>
+        <div className="py-16 text-center text-muted">
+          <p>{t("feed.noMatches")}</p>
+          {filters.q.trim() && !isDemo && (
+            <button
+              onClick={() => setYtSearch(filters.q.trim())}
+              className="mt-4 inline-flex items-center gap-2 px-4 py-2 rounded-xl font-semibold bg-accent text-accent-fg hover:opacity-90 transition"
+            >
+              <Youtube className="w-4 h-4" />
+              {t("feed.yt.searchFor", { query: filters.q.trim() })}
+            </button>
+          )}
+        </div>
       ) : (
         <VirtualFeed
           items={items}

frontend/src/components/Header.tsx

@@ -1,5 +1,5 @@
 import { useTranslation } from "react-i18next";
-import { Library, Search, User } from "lucide-react";
+import { Library, Search, User, Youtube } from "lucide-react";
 import type { FeedFilters, Me } from "../lib/api";
 import type { Page } from "../lib/urlState";
 import SyncStatus from "./SyncStatus";
@@ -13,14 +13,20 @@ export default function Header({
   setFilters,
   page,
   onGoToFullHistory,
+  onYtSearch,
 }: {
   me: Me;
   filters: FeedFilters;
   setFilters: (f: FeedFilters) => void;
   page: Page;
   onGoToFullHistory: () => void;
+  // Trigger a live YouTube search for the current term (hidden for the demo account, which
+  // can't spend the shared quota).
+  onYtSearch: (q: string) => void;
 }) {
   const { t } = useTranslation();
+  const canSearchYt = !me.is_demo;
+  const trimmedQ = filters.q.trim();
 
   return (
     <header className="glass h-14 shrink-0 border-b border-border flex items-center gap-3 px-4 z-20">
@@ -56,14 +62,31 @@ export default function Header({
       )}
 
       {page === "feed" ? (
-        <div className="flex-1 max-w-xl mx-auto relative">
-          <Search className="w-4 h-4 absolute left-3 top-1/2 -translate-y-1/2 text-muted" />
-          <input
-            value={filters.q}
-            onChange={(e) => setFilters({ ...filters, q: e.target.value })}
-            placeholder={t("header.searchPlaceholder")}
-            className="w-full bg-card border border-border rounded-full pl-9 pr-4 py-2 text-sm outline-none focus:border-accent"
-          />
+        <div className="flex-1 max-w-xl mx-auto flex items-center gap-2">
+          <div className="flex-1 relative">
+            <Search className="w-4 h-4 absolute left-3 top-1/2 -translate-y-1/2 text-muted" />
+            <input
+              value={filters.q}
+              onChange={(e) => setFilters({ ...filters, q: e.target.value })}
+              onKeyDown={(e) => {
+                // Enter runs a live YouTube search for the typed term (the box itself filters
+                // the local catalog as you type; Enter escalates to the YouTube API).
+                if (e.key === "Enter" && trimmedQ && canSearchYt) onYtSearch(trimmedQ);
+              }}
+              placeholder={t("header.searchPlaceholder")}
+              className="w-full bg-card border border-border rounded-full pl-9 pr-4 py-2 text-sm outline-none focus:border-accent"
+            />
+          </div>
+          {trimmedQ && canSearchYt && (
+            <button
+              onClick={() => onYtSearch(trimmedQ)}
+              title={t("header.searchYoutubeTip")}
+              className="shrink-0 inline-flex items-center gap-1.5 rounded-full border border-border bg-card px-3 py-2 text-xs font-medium text-muted hover:text-accent hover:border-accent transition"
+            >
+              <Youtube className="w-4 h-4" />
+              <span className="hidden md:inline">{t("header.searchYoutube")}</span>
+            </button>
+          )}
         </div>
       ) : (
         <div className="flex-1 text-center text-sm font-semibold">

frontend/src/i18n/locales/de/config.json

@@ -19,6 +19,7 @@
     "smtp_password": { "label": "SMTP-Passwort", "hint": "App-Passwort. Verschlüsselt gespeichert; nur schreibbar — wird nie wieder angezeigt." },
     "quota_daily_budget": { "label": "Tägliches Kontingentbudget", "hint": "YouTube-Data-API-Einheiten pro Tag (kostenloses Limit 10.000). Standard 9000 lässt Puffer." },
     "backfill_quota_reserve": { "label": "Nachlade-Kontingentreserve", "hint": "Reservierte Einheiten, damit geplantes Nachladen interaktive Syncs / Anreicherung nie aushungert." },
+    "search_daily_limit_per_user": { "label": "Live-Suche — Tageslimit pro Nutzer", "hint": "Maximale Live-YouTube-Suchen pro Nutzer und Tag. Jede Suche kostet 100 Einheiten, das gemeinsame Budget reicht also für insgesamt nur ~80-90/Tag. 0 = Live-Suche deaktiviert." },
     "backfill_recent_max_videos": { "label": "Aktuelles Nachladen — max. Videos", "hint": "Neueste Videos pro Kanal beim ersten Durchlauf." },
     "backfill_recent_max_days": { "label": "Aktuelles Nachladen — max. Alter (Tage)", "hint": "Wie weit der erste Durchlauf pro Kanal zurückreicht." },
     "shorts_probe_max_seconds": { "label": "Shorts-Prüfung — max. Dauer (s)", "hint": "Nur Videos bis zu dieser Länge werden als mögliche Shorts geprüft." },

frontend/src/i18n/locales/de/feed.json

@@ -29,5 +29,17 @@
   "undo": "Rückgängig",
   "markedWatchedNamed": "Als angesehen markiert: „{{title}}”",
   "markedWatched": "Als angesehen markiert",
-  "unwatch": "Nicht mehr als angesehen"
+  "unwatch": "Nicht mehr als angesehen",
+  "searchDiscovered": "Über Suche gefunden",
+  "searchDiscoveredTip": "Auch Videos anzeigen, die nur über eine Live-YouTube-Suche in die Bibliothek kamen.",
+  "yt": {
+    "searchFor": "Auf YouTube suchen nach „{{query}}”",
+    "resultsFor": "YouTube-Ergebnisse für „{{query}}”",
+    "quotaNote": "Live-Ergebnisse — verbraucht gemeinsames API-Kontingent",
+    "back": "Zurück zum Feed",
+    "searching": "Suche auf YouTube…",
+    "noResults": "Keine YouTube-Videos gefunden.",
+    "error": "YouTube-Suche fehlgeschlagen.",
+    "loadMore": "Mehr laden (verbraucht Kontingent)"
+  }
 }

frontend/src/i18n/locales/de/header.json

@@ -1,6 +1,8 @@
 {
   "feed": "Feed",
   "searchPlaceholder": "Deine Abos durchsuchen…",
+  "searchYoutube": "Auf YouTube suchen",
+  "searchYoutubeTip": "Live auf YouTube nach diesem Begriff suchen (verbraucht gemeinsames API-Kontingent). Du kannst auch Enter drücken.",
   "channelManager": "Kanalverwaltung",
   "usageStats": "Nutzung & Statistik",
   "scheduler": "Planer",

frontend/src/i18n/locales/de/quotaActions.json

@@ -8,6 +8,7 @@
   "videos_backfill_full": "Vollständigen Verlauf laden",
   "videos_enrich": "Video-Anreicherung",
   "videos_lookup": "Video-Abfrage",
+  "videos_search": "Live-Suche",
   "channels_discover": "Kanal-Entdeckung",
   "channels_subscribe": "Abonnieren",
   "channels_unsubscribe": "Abo beenden",

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

@@ -19,6 +19,7 @@
     "smtp_password": { "label": "SMTP password", "hint": "App password. Stored encrypted; write-only — it's never shown back." },
     "quota_daily_budget": { "label": "Daily quota budget", "hint": "Total YouTube Data API units to spend per day (free tier is 10,000). Default 9000 leaves headroom." },
     "backfill_quota_reserve": { "label": "Backfill quota reserve", "hint": "Units kept in reserve so scheduled backfill never starves interactive syncs / enrichment." },
+    "search_daily_limit_per_user": { "label": "Live search — daily limit per user", "hint": "Max live YouTube searches per user per day. Each search costs 100 units, so the shared budget only affords ~80-90/day total. Set 0 to disable live search." },
     "backfill_recent_max_videos": { "label": "Recent backfill — max videos", "hint": "Newest videos fetched per channel on the first pass." },
     "backfill_recent_max_days": { "label": "Recent backfill — max age (days)", "hint": "How far back the first pass reaches per channel." },
     "shorts_probe_max_seconds": { "label": "Shorts probe — max duration (s)", "hint": "Only videos at or below this length are probed as possible Shorts." },

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

@@ -29,5 +29,17 @@
   "undo": "Undo",
   "markedWatchedNamed": "Marked watched “{{title}}”",
   "markedWatched": "Marked watched",
-  "unwatch": "Unwatch"
+  "unwatch": "Unwatch",
+  "searchDiscovered": "Search-discovered",
+  "searchDiscoveredTip": "Also show videos that entered the library only through a live YouTube search.",
+  "yt": {
+    "searchFor": "Search YouTube for “{{query}}”",
+    "resultsFor": "YouTube results for “{{query}}”",
+    "quotaNote": "Live results — uses shared API quota",
+    "back": "Back to feed",
+    "searching": "Searching YouTube…",
+    "noResults": "No YouTube videos found.",
+    "error": "YouTube search failed.",
+    "loadMore": "Load more (uses quota)"
+  }
 }

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

@@ -1,6 +1,8 @@
 {
   "feed": "Feed",
   "searchPlaceholder": "Search your subscriptions…",
+  "searchYoutube": "Search YouTube",
+  "searchYoutubeTip": "Search live on YouTube for this term (uses shared API quota). You can also press Enter.",
   "channelManager": "Channel manager",
   "usageStats": "Usage & stats",
   "scheduler": "Scheduler",

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

@@ -8,6 +8,7 @@
   "videos_backfill_full": "Full-history backfill",
   "videos_enrich": "Video enrichment",
   "videos_lookup": "Video lookup",
+  "videos_search": "Live search",
   "channels_discover": "Channel discovery",
   "channels_subscribe": "Subscribe",
   "channels_unsubscribe": "Unsubscribe",

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

@@ -19,6 +19,7 @@
     "smtp_password": { "label": "SMTP-jelszó", "hint": "Alkalmazásjelszó. Titkosítva tárolva; csak írható — soha nem jelenik meg újra." },
     "quota_daily_budget": { "label": "Napi kvótakeret", "hint": "Naponta elkölthető YouTube Data API-egységek (az ingyenes keret 10 000). Az alap 9000 tartalékot hagy." },
     "backfill_quota_reserve": { "label": "Letöltési kvótatartalék", "hint": "Tartalékban tartott egységek, hogy az ütemezett letöltés ne éheztesse ki az interaktív szinkront / gazdagítást." },
+    "search_daily_limit_per_user": { "label": "Élő keresés — napi limit / felhasználó", "hint": "Maximális élő YouTube-keresés felhasználónként naponta. Egy keresés 100 egységbe kerül, így a közös büdzséből összesen csak ~80-90 fér bele naponta. 0 = élő keresés kikapcsolva." },
     "backfill_recent_max_videos": { "label": "Friss letöltés — max videó", "hint": "Csatornánként az első körben letöltött legújabb videók száma." },
     "backfill_recent_max_days": { "label": "Friss letöltés — max kor (nap)", "hint": "Az első kör csatornánként meddig nyúl vissza." },
     "shorts_probe_max_seconds": { "label": "Shorts-vizsgálat — max hossz (mp)", "hint": "Csak az ennél nem hosszabb videókat vizsgáljuk lehetséges Shortsként." },

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

@@ -29,5 +29,17 @@
   "undo": "Visszavonás",
   "markedWatchedNamed": "Megnézettnek jelölve: „{{title}}”",
   "markedWatched": "Megnézettnek jelölve",
-  "unwatch": "Megnézés visszavonása"
+  "unwatch": "Megnézés visszavonása",
+  "searchDiscovered": "Keresésből talált",
+  "searchDiscoveredTip": "Mutasd azokat a videókat is, amelyek csak élő YouTube-keresésen át kerültek a könyvtárba.",
+  "yt": {
+    "searchFor": "Keresés a YouTube-on: „{{query}}”",
+    "resultsFor": "YouTube találatok erre: „{{query}}”",
+    "quotaNote": "Élő találatok — a közös API-kvótát fogyasztja",
+    "back": "Vissza a hírfolyamhoz",
+    "searching": "Keresés a YouTube-on…",
+    "noResults": "Nincs YouTube-találat.",
+    "error": "A YouTube-keresés nem sikerült.",
+    "loadMore": "Továbbiak betöltése (kvótát fogyaszt)"
+  }
 }

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

@@ -1,6 +1,8 @@
 {
   "feed": "Hírfolyam",
   "searchPlaceholder": "Keresés a feliratkozásaid között…",
+  "searchYoutube": "Keresés a YouTube-on",
+  "searchYoutubeTip": "Élő keresés a YouTube-on erre a kifejezésre (a közös API-kvótát fogyasztja). Entert is nyomhatsz.",
   "channelManager": "Csatornakezelő",
   "usageStats": "Használat és statisztika",
   "scheduler": "Ütemező",

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

@@ -8,6 +8,7 @@
   "videos_backfill_full": "Teljes előzmény betöltése",
   "videos_enrich": "Videó-gazdagítás",
   "videos_lookup": "Videó-lekérdezés",
+  "videos_search": "Élő keresés",
   "channels_discover": "Csatorna-felfedezés",
   "channels_subscribe": "Feliratkozás",
   "channels_unsubscribe": "Leiratkozás",

frontend/src/lib/api.ts

@@ -141,6 +141,9 @@ export interface FeedFilters {
   includeShorts: boolean;
   includeLive: boolean;
   show: string;
+  // Library (scope "all") only: when set, also show videos that entered the catalog via a
+  // live YouTube search. Default (falsy) hides that search-discovered "noise".
+  showSearchDiscovered?: boolean;
   channelId?: string;
   channelName?: string;
   maxAgeDays?: number;
@@ -306,6 +309,8 @@ function filterParams(f: FeedFilters): URLSearchParams {
   if (f.dateTo) p.set("published_before", f.dateTo);
   if (f.minDuration != null) p.set("min_duration", String(f.minDuration));
   if (f.maxDuration != null) p.set("max_duration", String(f.maxDuration));
+  // Only relevant in Library scope; the backend ignores it for "my". Default = hide.
+  p.set("exclude_search_discovered", String(!f.showSearchDiscovered));
   return p;
 }
 
@@ -558,6 +563,14 @@ export const api = {
     req(`/api/feed?${feedQuery(f, cursor, limit)}`),
   feedCount: (f: FeedFilters): Promise<{ count: number }> =>
     req(`/api/feed/count?${filterParams(f).toString()}`),
+  // Live YouTube search: results are materialised into the catalog and returned as feed cards.
+  // `quiet` so the YT-search panel can render quota/limit errors (incl. 429) inline instead of
+  // popping the global modal. `cursor` is the YouTube nextPageToken (each page spends 100 units).
+  searchYoutube: (q: string, cursor: string | null): Promise<FeedResponse> => {
+    const p = new URLSearchParams({ q });
+    if (cursor) p.set("cursor", cursor);
+    return req(`/api/search/youtube?${p.toString()}`, {}, { quiet: true });
+  },
   facets: (f: FeedFilters): Promise<{ counts: Record<string, number> }> =>
     req(`/api/facets?${filterParams(f).toString()}`),
   // idempotent: setting a state / saving a progress checkpoint is safe to replay, so these