fix(ui): notification UX — outside-click close, toast countdown, hide entry actions

- NotificationCenter closes on outside click (document listener, not an overlay
  that the blurred header trapped) and no longer needs a second bell click.
- Toasts show a level-colored countdown bar and auto-dismiss faster (6s default).
- Hidden-video notifications carry structured meta so the center offers an in-app
  'Find in feed' (jump to that channel's hidden videos) and a one-click 'Unhide',
  working even after a reload when the live Undo callback is gone.

frontend/src/components/Feed.tsx

@@ -1,7 +1,7 @@
 import { useEffect, useRef, useState } from "react";
 import { useInfiniteQuery, useQuery, useQueryClient } from "@tanstack/react-query";
 import { api, type FeedFilters, type Video } from "../lib/api";
-import { toast } from "../lib/notifications";
+import { notify } from "../lib/notifications";
 import VideoCard from "./VideoCard";
 
 const PAGE = 60;
@@ -73,7 +73,18 @@ export default function Feed({
       .then(() => qc.invalidateQueries({ queryKey: ["feed"] }))
       .catch(() => {});
     if (status === "hidden") {
-      toast("Video hidden", { label: "Undo", onClick: () => onState(id, "new") });
+      const v = (query.data?.pages ?? []).flatMap((p) => p.items).find((x) => x.id === id);
+      notify({
+        message: v?.title ? `Hidden “${v.title}”` : "Video hidden",
+        action: { label: "Undo", onClick: () => onState(id, "new") },
+        meta: {
+          kind: "video-hidden",
+          videoId: id,
+          title: v?.title ?? "this video",
+          channelId: v?.channel_id ?? "",
+          channelName: v?.channel_title ?? "",
+        },
+      });
     }
   }
 

frontend/src/components/Header.tsx

@@ -131,7 +131,7 @@ export default function Header({
           )}
         </div>
 
-        <NotificationCenter />
+        <NotificationCenter filters={filters} setFilters={setFilters} />
 
         <div className="pl-1">
           <AccountMenu me={me} logout={logout} />

frontend/src/components/NotificationCenter.tsx

@@ -1,13 +1,16 @@
-import { useEffect, useRef, useState } from "react";
-import { useSyncExternalStore } from "react";
-import { Bell, Trash2 } from "lucide-react";
+import { useEffect, useRef, useState, useSyncExternalStore } from "react";
+import { useQueryClient } from "@tanstack/react-query";
+import { Bell, Eye, Search, Trash2 } from "lucide-react";
+import { api, type FeedFilters } from "../lib/api";
 import {
   clearAll,
   dismiss,
   getNotifications,
   getUnreadCount,
   markAllRead,
+  notify,
   subscribe,
+  type NotifMeta,
 } from "../lib/notifications";
 import { LEVEL_STYLE } from "./Toaster";
 
@@ -22,17 +25,55 @@ function relTime(ts: number): string {
   return `${d}d ago`;
 }
 
-export default function NotificationCenter() {
+export default function NotificationCenter({
+  filters,
+  setFilters,
+}: {
+  filters: FeedFilters;
+  setFilters: (f: FeedFilters) => void;
+}) {
   const notifications = useSyncExternalStore(subscribe, getNotifications, getNotifications);
   const unread = useSyncExternalStore(subscribe, getUnreadCount, getUnreadCount);
   const [open, setOpen] = useState(false);
   const wrap = useRef<HTMLDivElement>(null);
+  const qc = useQueryClient();
+
+  // Close when clicking anywhere outside the panel.
+  useEffect(() => {
+    if (!open) return;
+    function onDown(e: MouseEvent) {
+      if (wrap.current && !wrap.current.contains(e.target as Node)) setOpen(false);
+    }
+    document.addEventListener("mousedown", onDown);
+    return () => document.removeEventListener("mousedown", onDown);
+  }, [open]);
 
   // Opening the center marks everything read.
   useEffect(() => {
     if (open) markAllRead();
   }, [open, notifications.length]);
 
+  function locateHidden(meta: NotifMeta) {
+    setFilters({
+      ...filters,
+      show: "hidden",
+      channelId: meta.channelId || undefined,
+      channelName: meta.channelName || undefined,
+    });
+    setOpen(false);
+  }
+
+  function unhide(meta: NotifMeta) {
+    api
+      .setState(meta.videoId, "new")
+      .then(() => {
+        qc.invalidateQueries({ queryKey: ["feed"] });
+        qc.invalidateQueries({ queryKey: ["feed-count"] });
+        notify({ level: "success", message: `Unhidden “${meta.title}”` });
+      })
+      .catch(() => {});
+  }
+
   return (
     <div className="relative" ref={wrap}>
       <button
@@ -49,52 +90,69 @@ export default function NotificationCenter() {
       </button>
 
       {open && (
-        <>
-          <div className="fixed inset-0 z-20" onClick={() => setOpen(false)} />
-          <div className="absolute right-0 mt-2 w-80 max-w-[calc(100vw-2rem)] rounded-xl border border-border bg-surface shadow-2xl z-30 flex flex-col max-h-[70vh]">
-            <div className="flex items-center justify-between px-3 py-2 border-b border-border">
-              <div className="text-sm font-semibold">Notifications</div>
-              {notifications.length > 0 && (
-                <button
-                  onClick={clearAll}
-                  className="flex items-center gap-1 text-xs text-muted hover:text-accent transition"
-                  title="Clear all"
-                >
-                  <Trash2 className="w-3.5 h-3.5" />
-                  Clear
-                </button>
-              )}
-            </div>
+        <div className="absolute right-0 mt-2 w-80 max-w-[calc(100vw-2rem)] rounded-xl border border-border bg-surface shadow-2xl z-30 flex flex-col max-h-[70vh]">
+          <div className="flex items-center justify-between px-3 py-2 border-b border-border">
+            <div className="text-sm font-semibold">Notifications</div>
+            {notifications.length > 0 && (
+              <button
+                onClick={clearAll}
+                className="flex items-center gap-1 text-xs text-muted hover:text-accent transition"
+                title="Clear all"
+              >
+                <Trash2 className="w-3.5 h-3.5" />
+                Clear
+              </button>
+            )}
+          </div>
 
-            <div className="overflow-y-auto">
-              {notifications.length === 0 ? (
-                <div className="px-3 py-8 text-center text-sm text-muted">
-                  No notifications yet.
-                </div>
-              ) : (
-                notifications.map((n) => {
-                  const { icon: Icon, color } = LEVEL_STYLE[n.level];
-                  const needsAction = n.requiresInteraction && !n.dismissed;
-                  return (
-                    <div
-                      key={n.id}
-                      className={`flex items-start gap-2.5 px-3 py-2.5 border-b border-border/60 ${
-                        needsAction ? "bg-accent/5" : ""
-                      }`}
-                    >
-                      <Icon className={`w-4 h-4 shrink-0 mt-0.5 ${color}`} />
-                      <div className="min-w-0 flex-1">
-                        {n.title && <div className="text-sm font-semibold">{n.title}</div>}
-                        <div className="text-sm break-words">{n.message}</div>
-                        <div className="flex items-center gap-2 mt-0.5">
-                          <span className="text-[11px] text-muted">{relTime(n.ts)}</span>
-                          {needsAction && (
-                            <span className="text-[10px] uppercase tracking-wide font-semibold text-accent">
-                              Action needed
-                            </span>
-                          )}
+          <div className="overflow-y-auto">
+            {notifications.length === 0 ? (
+              <div className="px-3 py-8 text-center text-sm text-muted">No notifications yet.</div>
+            ) : (
+              notifications.map((n) => {
+                const { icon: Icon, color } = LEVEL_STYLE[n.level];
+                const needsAction = n.requiresInteraction && !n.dismissed;
+                const hidden = n.meta?.kind === "video-hidden" ? n.meta : null;
+                return (
+                  <div
+                    key={n.id}
+                    className={`flex items-start gap-2.5 px-3 py-2.5 border-b border-border/60 ${
+                      needsAction ? "bg-accent/5" : ""
+                    }`}
+                  >
+                    <Icon className={`w-4 h-4 shrink-0 mt-0.5 ${color}`} />
+                    <div className="min-w-0 flex-1">
+                      {n.title && <div className="text-sm font-semibold">{n.title}</div>}
+                      <div className="text-sm break-words">{n.message}</div>
+                      <div className="flex items-center gap-2 mt-0.5">
+                        <span className="text-[11px] text-muted">{relTime(n.ts)}</span>
+                        {needsAction && (
+                          <span className="text-[10px] uppercase tracking-wide font-semibold text-accent">
+                            Action needed
+                          </span>
+                        )}
+                      </div>
+
+                      {hidden ? (
+                        <div className="flex items-center gap-3 mt-1">
+                          <button
+                            onClick={() => locateHidden(hidden)}
+                            className="flex items-center gap-1 text-accent text-sm font-semibold hover:underline"
+                          >
+                            <Search className="w-3.5 h-3.5" />
+                            Find in feed
+                          </button>
+                          <button
+                            onClick={() => unhide(hidden)}
+                            className="flex items-center gap-1 text-accent text-sm font-semibold hover:underline"
+                          >
+                            <Eye className="w-3.5 h-3.5" />
+                            Unhide
+                          </button>
                         </div>
-                        {n.action && !n.dismissed && (
+                      ) : (
+                        n.action &&
+                        !n.dismissed && (
                           <button
                             onClick={() => {
                               n.action!.onClick();
@@ -104,15 +162,15 @@ export default function NotificationCenter() {
                           >
                             {n.action.label}
                           </button>
-                        )}
-                      </div>
+                        )
+                      )}
                     </div>
-                  );
-                })
-              )}
-            </div>
+                  </div>
+                );
+              })
+            )}
           </div>
-        </>
+        </div>
       )}
     </div>
   );

frontend/src/components/Toaster.tsx

@@ -16,13 +16,13 @@ import {
 
 export const LEVEL_STYLE: Record<
   NotifLevel,
-  { icon: typeof Info; color: string }
+  { icon: typeof Info; color: string; bar: string }
 > = {
-  info: { icon: Info, color: "text-accent" },
-  success: { icon: CheckCircle2, color: "text-emerald-400" },
-  warning: { icon: AlertTriangle, color: "text-amber-400" },
-  error: { icon: AlertCircle, color: "text-red-400" },
-  fatal: { icon: XCircle, color: "text-red-500" },
+  info: { icon: Info, color: "text-accent", bar: "bg-accent" },
+  success: { icon: CheckCircle2, color: "text-emerald-400", bar: "bg-emerald-400" },
+  warning: { icon: AlertTriangle, color: "text-amber-400", bar: "bg-amber-400" },
+  error: { icon: AlertCircle, color: "text-red-400", bar: "bg-red-400" },
+  fatal: { icon: XCircle, color: "text-red-500", bar: "bg-red-500" },
 };
 
 export default function Toaster() {
@@ -31,11 +31,11 @@ export default function Toaster() {
   return (
     <div className="fixed top-4 right-4 z-50 flex flex-col gap-2 w-80 max-w-[calc(100vw-2rem)]">
       {toasts.map((t) => {
-        const { icon: Icon, color } = LEVEL_STYLE[t.level];
+        const { icon: Icon, color, bar } = LEVEL_STYLE[t.level];
         return (
           <div
             key={t.id}
-            className="bg-surface border border-border rounded-xl shadow-2xl px-3 py-3 flex items-start gap-3 animate-[fadeIn_0.15s_ease]"
+            className="relative overflow-hidden bg-surface border border-border rounded-xl shadow-2xl px-3 py-3 flex items-start gap-3"
           >
             <Icon className={`w-5 h-5 shrink-0 mt-0.5 ${color}`} />
             <div className="min-w-0 flex-1">
@@ -60,6 +60,12 @@ export default function Toaster() {
             >
               <X className="w-4 h-4" />
             </button>
+            {t.duration && (
+              <div
+                className={`absolute left-0 bottom-0 h-0.5 w-full origin-left ${bar}`}
+                style={{ animation: `toastbar ${t.duration}ms linear forwards` }}
+              />
+            )}
           </div>
         );
       })}