refactor(channels): share one ChannelLink + channelYouTubeUrl helper

The "avatar + name + open-on-YouTube" cell and the @handle-or-/channel/<id>
URL were copy-pasted across the channel manager, the discovery tab, the
subscribe notice and the player. Extract a single ChannelLink component
(optional in-app onView, middle-click opens YouTube) and a channelYouTubeUrl
helper, and route all four through them. Removes the NameCell / DiscoveryNameCell
duplication (the latter introduced with the discovery tab).

frontend/src/components/ChannelDiscovery.tsx

@@ -1,11 +1,11 @@
 import { useTranslation } from "react-i18next";
 import { useMutation, useQuery, useQueryClient } from "@tanstack/react-query";
-import { ExternalLink, UserPlus } from "lucide-react";
+import { UserPlus } from "lucide-react";
 import { api, HttpError, type DiscoveredChannel } from "../lib/api";
 import { formatViews } from "../lib/format";
 import { notify } from "../lib/notifications";
 import Tooltip from "./Tooltip";
-import Avatar from "./Avatar";
+import ChannelLink from "./ChannelLink";
 import DataTable, { type Column } from "./DataTable";
 
 // The Channel manager's "Discovery" tab: channels that turn up in the user's playlists but
@@ -70,7 +70,9 @@ export default function ChannelDiscovery({
       sortValue: (c) => (c.title ?? c.id).toLowerCase(),
       filter: { kind: "text", get: (c) => `${c.title ?? ""} ${c.handle ?? ""}` },
       cardPrimary: true,
-      render: (c) => <DiscoveryNameCell c={c} />,
+      render: (c) => (
+        <ChannelLink id={c.id} title={c.title} handle={c.handle} thumbnailUrl={c.thumbnail_url} />
+      ),
     },
     {
       key: "subs",
@@ -153,27 +155,3 @@ export default function ChannelDiscovery({
     </div>
   );
 }
-
-function DiscoveryNameCell({ c }: { c: DiscoveredChannel }) {
-  const { t } = useTranslation();
-  const ytUrl = c.handle
-    ? `https://www.youtube.com/@${c.handle.replace(/^@/, "")}`
-    : `https://www.youtube.com/channel/${c.id}`;
-  return (
-    <div className="flex items-center gap-2 min-w-0">
-      <Avatar src={c.thumbnail_url} fallback={c.title ?? ""} className="w-8 h-8 rounded-full shrink-0" />
-      <span className="text-sm font-medium truncate min-w-0">{c.title ?? c.id}</span>
-      <Tooltip hint={t("channels.row.openOnYouTube")}>
-        <a
-          href={ytUrl}
-          target="_blank"
-          rel="noopener noreferrer"
-          className="text-muted hover:text-accent shrink-0"
-          aria-label={t("channels.row.openOnYouTube")}
-        >
-          <ExternalLink className="w-3.5 h-3.5" />
-        </a>
-      </Tooltip>
-    </div>
-  );
-}

frontend/src/components/ChannelLink.tsx

@@ -0,0 +1,64 @@
+import { useTranslation } from "react-i18next";
+import { ExternalLink } from "lucide-react";
+import Avatar from "./Avatar";
+import Tooltip from "./Tooltip";
+import { channelYouTubeUrl } from "../lib/format";
+
+// Avatar + channel name + "open on YouTube" link, shared by the Channel manager and the
+// discovery list (and anywhere else that lists a channel). When `onView` is given the name
+// is a button that opens the in-app channel view, with middle-click opening YouTube in a new
+// tab; without it the name is plain text.
+export default function ChannelLink({
+  id,
+  title,
+  handle,
+  thumbnailUrl,
+  onView,
+}: {
+  id: string;
+  title: string | null;
+  handle?: string | null;
+  thumbnailUrl: string | null;
+  onView?: () => void;
+}) {
+  const { t } = useTranslation();
+  const ytUrl = channelYouTubeUrl(id, handle);
+  const name = title ?? id;
+  return (
+    <div className="flex items-center gap-2 min-w-0">
+      <Avatar src={thumbnailUrl} fallback={title ?? ""} className="w-8 h-8 rounded-full shrink-0" />
+      {onView ? (
+        <button
+          onClick={onView}
+          onAuxClick={(e) => {
+            // Middle-click opens the channel's YouTube page in a new tab; left-click keeps
+            // opening the in-app channel detail.
+            if (e.button === 1) {
+              e.preventDefault();
+              window.open(ytUrl, "_blank", "noopener,noreferrer");
+            }
+          }}
+          onMouseDown={(e) => {
+            if (e.button === 1) e.preventDefault(); // suppress middle-click autoscroll
+          }}
+          className="text-sm font-medium truncate hover:text-accent text-left min-w-0"
+        >
+          {name}
+        </button>
+      ) : (
+        <span className="text-sm font-medium truncate min-w-0">{name}</span>
+      )}
+      <Tooltip hint={t("channels.row.openOnYouTube")}>
+        <a
+          href={ytUrl}
+          target="_blank"
+          rel="noopener noreferrer"
+          className="text-muted hover:text-accent shrink-0"
+          aria-label={t("channels.row.openOnYouTube")}
+        >
+          <ExternalLink className="w-3.5 h-3.5" />
+        </a>
+      </Tooltip>
+    </div>
+  );
+}

frontend/src/components/Channels.tsx

@@ -5,7 +5,6 @@ import {
   ArrowDown,
   ArrowUp,
   Check,
-  ExternalLink,
   Eye,
   EyeOff,
   History,
@@ -18,8 +17,8 @@ import { api, HttpError, type ManagedChannel, type Tag } from "../lib/api";
 import { formatEta, formatViews, relativeTime } from "../lib/format";
 import { notify } from "../lib/notifications";
 import Tooltip from "./Tooltip";
-import Avatar from "./Avatar";
 import DataTable, { type Column } from "./DataTable";
+import ChannelLink from "./ChannelLink";
 import ChannelDiscovery from "./ChannelDiscovery";
 import TagManager from "./TagManager";
 import { useConfirm } from "./ConfirmProvider";
@@ -242,7 +241,15 @@ export default function Channels({
       sortValue: (c) => (c.title ?? c.id).toLowerCase(),
       filter: { kind: "text", get: (c) => `${c.title ?? ""} ${c.handle ?? ""}` },
       cardPrimary: true,
-      render: (c) => <NameCell c={c} onView={() => onView(c)} />,
+      render: (c) => (
+        <ChannelLink
+          id={c.id}
+          title={c.title}
+          handle={c.handle}
+          thumbnailUrl={c.thumbnail_url}
+          onView={() => onView(c)}
+        />
+      ),
     },
     {
       key: "stored",
@@ -567,45 +574,6 @@ function PriorityCell({ c, onPriority }: { c: ManagedChannel; onPriority: (delta
   );
 }
 
-function NameCell({ c, onView }: { c: ManagedChannel; onView: () => void }) {
-  const { t } = useTranslation();
-  const ytUrl = c.handle
-    ? `https://www.youtube.com/@${c.handle.replace(/^@/, "")}`
-    : `https://www.youtube.com/channel/${c.id}`;
-  return (
-    <div className="flex items-center gap-2 min-w-0">
-      <Avatar src={c.thumbnail_url} fallback={c.title ?? ""} className="w-8 h-8 rounded-full shrink-0" />
-      <button
-        onClick={onView}
-        onAuxClick={(e) => {
-          // Middle-click opens the channel's YouTube page in a new tab; left-click
-          // keeps opening the in-app channel detail.
-          if (e.button === 1) {
-            e.preventDefault();
-            window.open(ytUrl, "_blank", "noopener,noreferrer");
-          }
-        }}
-        onMouseDown={(e) => {
-          if (e.button === 1) e.preventDefault(); // suppress middle-click autoscroll
-        }}
-        className="text-sm font-medium truncate hover:text-accent text-left min-w-0"
-      >
-        {c.title ?? c.id}
-      </button>
-      <Tooltip hint={t("channels.row.openOnYouTube")}>
-        <a
-          href={ytUrl}
-          target="_blank"
-          rel="noopener noreferrer"
-          className="text-muted hover:text-accent shrink-0"
-          aria-label={t("channels.row.openOnYouTube")}
-        >
-          <ExternalLink className="w-3.5 h-3.5" />
-        </a>
-      </Tooltip>
-    </div>
-  );
-}
 
 // Status only — the backfill *action* lives in the Actions column. When both recent and
 // full history are in, collapse to a single "fully synced" chip; otherwise show what's

frontend/src/components/NotificationsPanel.tsx

@@ -18,6 +18,7 @@ import {
   type VideoHiddenMeta,
   type VideoWatchedMeta,
 } from "../lib/notifications";
+import { channelYouTubeUrl } from "../lib/format";
 import type { Page } from "../lib/urlState";
 import { LEVEL_STYLE } from "./Toaster";
 
@@ -380,7 +381,7 @@ function ClientActivityRow({
               {t("notifications.openInManager")}
             </button>
             <a
-              href={`https://www.youtube.com/channel/${subscribed.channelId}`}
+              href={channelYouTubeUrl(subscribed.channelId)}
               target="_blank"
               rel="noopener noreferrer"
               className="flex items-center gap-1 text-accent text-sm font-semibold hover:underline"

frontend/src/components/PlayerModal.tsx

@@ -7,7 +7,7 @@ import { AlertTriangle, ArrowLeft, Check, CheckCheck, ExternalLink, SkipBack, Sk
 import Avatar from "./Avatar";
 import AddToPlaylist from "./AddToPlaylist";
 import { api, type Video } from "../lib/api";
-import { formatDuration, formatViews, relativeTime } from "../lib/format";
+import { channelYouTubeUrl, formatDuration, formatViews, relativeTime } from "../lib/format";
 
 // Turn a description into clickable nodes:
 //  - bare timestamps (mm:ss / hh:mm:ss) → seek the inline player
@@ -572,7 +572,7 @@ export default function PlayerModal({
             {navigated ? (
               detail.data?.channel_id ? (
                 <a
-                  href={`https://www.youtube.com/channel/${detail.data.channel_id}`}
+                  href={channelYouTubeUrl(detail.data.channel_id)}
                   target="_blank"
                   rel="noreferrer"
                   className="font-medium hover:text-accent shrink-0"