fix: rounds tab json_decode crash + players tab empty (UUID type mismatch)

1. pairings/results JSONB columns already decoded by Supabase — added
   is_array check before json_decode (same pattern as tiebreak fix).

2. Bot player_id was 'bot_xyz' string but column is UUID type — PostgREST
   silently rejected every insert. Now generates proper v4 UUIDs.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

modules/tournaments/services/BotSimulationService.php

@@ -164,9 +164,16 @@ class BotSimulationService
 
         $inserted = 0;
         foreach ($players as $player) {
+            $botUuid = sprintf('%04x%04x-%04x-%04x-%04x-%04x%04x%04x',
+                random_int(0, 0xffff), random_int(0, 0xffff),
+                random_int(0, 0xffff),
+                random_int(0, 0x0fff) | 0x4000,
+                random_int(0, 0x3fff) | 0x8000,
+                random_int(0, 0xffff), random_int(0, 0xffff), random_int(0, 0xffff)
+            );
             $db->insert('tournament_registrations', [
                 'tournament_id' => $tournamentId,
-                'player_id' => 'bot_' . uniqid(),
+                'player_id' => $botUuid,
                 'status' => 'registered',
                 'is_bot' => true,
                 'bot_metadata' => json_encode([

modules/tournaments/views/show.php

@@ -311,8 +311,10 @@ $tabs['arbiter'] = 'أدوات الحكم';
 
             <div class="round-pairings-container" id="roundPairings_<?= $round['id'] ?>">
                 <?php
-                $pairingsJson = json_decode($round['pairings'] ?? '[]', true);
-                $results = json_decode($round['results'] ?? '[]', true);
+                $rawPairings = $round['pairings'] ?? '[]';
+                $pairingsJson = is_array($rawPairings) ? $rawPairings : (json_decode($rawPairings, true) ?? []);
+                $rawResults = $round['results'] ?? '[]';
+                $results = is_array($rawResults) ? $rawResults : (json_decode($rawResults, true) ?? []);
                 ?>
                 <?php if (!empty($results)): ?>
                     <table class="data-table">