feat: leaderboard with top (by period) and new tabs

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

app/Models/Product.php

@@ -284,6 +284,42 @@ class Product extends Model
         return $query->withCount('upvotes')->orderBy('upvotes_count', 'desc');
     }
 
+    /**
+     * Leaderboard periods: key => label.
+     */
+    public const LEADERBOARD_PERIODS = [
+        'today' => 'Today',
+        'week' => 'This week',
+        'month' => 'This month',
+        'all' => 'All time',
+    ];
+
+    /**
+     * Approved products ranked by the upvotes they received in the period,
+     * then by total upvotes, then newest. Products with no upvotes in the
+     * period are left out. Adds `period_upvotes_count` and `total_upvotes_count`.
+     */
+    public function scopeTopFor(Builder $query, string $period): Builder
+    {
+        $since = match ($period) {
+            'today' => now()->startOfDay(),
+            'week' => now()->subDays(7),
+            'month' => now()->subDays(30),
+            default => null,
+        };
+
+        $inPeriod = fn (Builder $upvotes) => $since ? $upvotes->where('created_at', '>=', $since) : $upvotes;
+
+        return $query->approved()
+            ->whereHas('upvotes', $inPeriod)
+            ->withCount(['upvotes as period_upvotes_count' => $inPeriod])
+            ->withCount('upvotes as total_upvotes_count')
+            ->orderByDesc('period_upvotes_count')
+            ->orderByDesc('total_upvotes_count')
+            ->orderByDesc('products.created_at')
+            ->orderByDesc('products.id');
+    }
+
     /**
      * Scope a query to sort products.
      */