feat(channels): R14 zoom-fit table — fluid columns + column fogyókúra

- DataTable: opt-in `fixedLayout` (colgroup + table-layout:fixed) so the
  table fits its container at any zoom/text-size; only the channel manager
  opts in — playlists/discovery/Plex keep auto-sizing.
- Remove the N/S/L and Sync columns from the manager table. Fully-synced
  status becomes a ✓ charm on the Stored count; the sync filter moves to an
  `applySyncFilter` pre-filter still driven by the top chips.
- Channel column is now fluid: ChannelLink truncates with the full name on
  hover (title). Data columns get fixed widths so only Channel/About flex.
- N/S/L (normal/short/live) breakdown moves to the channel page: add the
  three counts to the channelDetail endpoint (one grouped query, same
  filters as the list) + the ChannelDetail type + a meta-line entry.
- Drop the now-dead sync/types i18n keys (en+hu).

frontend/src/components/ChannelPage.tsx

@@ -264,6 +264,15 @@ export default function ChannelPage({
     ch?.total_view_count != null
       ? t("channel.totalViews", { formatted: formatViews(ch.total_view_count) })
       : null,
+    // Per-type breakdown (R14 moved this off the manager table's N/S/L column). Only meaningful
+    // once we actually hold some of the channel's videos.
+    ch && ch.stored_videos > 0
+      ? t("channel.videoTypes", {
+          normal: ch.count_normal,
+          short: ch.count_short,
+          live: ch.count_live,
+        })
+      : null,
     joined ? t("channel.joined", { date: joined }) : null,
   ].filter(Boolean) as string[];
   // The channel page owns no scroller of its own (PageShell provides the one app scroller). Its