fix(theme): R10 S1 review fixes — restore distinctions lost in the codemod

- PlexBrowse PLAYABLE_TINT: transcode was collapsed onto remux's bg-warn; give it
  bg-danger so direct/remux/transcode read as a distinct good->heavy green/amber/red
  gradient again.
- Live indicators (VideoCard row + thumbnail badge, playlistColumns badge): revert to
  fixed live-red + white instead of the --danger token. 'live' is a broadcast marker,
  not an error state, and the badge sits over a thumbnail (no app-bg contrast need);
  restores the conventional red/white LIVE look and decouples it from error retunes.
- ChannelPage exploring badge: drop the redundant dark:text-warn (no-op after the
  token rename — --warn is already theme-scoped).

error/fatal toast shade merge left as-is (both are 'bad'; the 400/500 step was subtle).

frontend/src/components/playlistColumns.tsx

@@ -106,7 +106,7 @@ export function playlistColumns({
           <span
             className={`text-[10px] font-semibold uppercase tracking-wide px-1.5 py-0.5 rounded ${
               v.live_status === "live"
-                ? "bg-danger/90 text-danger-fg"
+                ? "bg-red-500/90 text-white" /* fixed live-red, not the status token */
                 : "bg-card border border-border text-muted"
             }`}
           >