fix(feeds): trending windows 24/168/720, music newest-first, channel popular tiebreak

- Trending: window options are now 24 / 168 / 720 h (Today / This Week
  / This Month) and the controller snaps the ?hours param to one of
  those values instead of clamping to [24, 168] — which silently made
  the "This Month" tab show one-week data. Ranking is pure in-window
  view count, with likes and newest createdAt as the tiebreaks (not
  the old weighted sum of views + velocity + recency bonus + likes,
  which was impossible to reason about and hid videos that genuinely
  led the window).
- Music + /videos?filter=music: previously the branch skipped the
  latest() call so Eloquent fell back to id ASC and the music tab
  opened on the oldest uploads. Now both branches share one
  ->latest() call.
- Channel Popular sort: order by views desc, likes desc, created_at
  desc so two equally-viewed videos no longer flip order between
  loads.

Co-Authored-By: Claude Opus 4.7 (1M context) <[email protected]>

app/Http/Controllers/UserController.php

@@ -246,7 +246,14 @@ class UserController extends Controller
 
         switch ($sort) {
             case 'popular':
-                $baseQuery->withCount('viewers')->orderByDesc('viewers_count');
+                // Views first, likes as the tiebreak, created_at as the final
+                // tiebreak so two videos with the same view+like counts don't
+                // flip order between page loads.
+                $baseQuery
+                    ->withCount(['viewers as viewers_count', 'likes as likes_count'])
+                    ->orderByDesc('viewers_count')
+                    ->orderByDesc('likes_count')
+                    ->latest();
                 break;
             case 'oldest':
                 $baseQuery->oldest();