修复悄悄话文字颜色及不能发数字0的问题

tests/Feature/ChatControllerTest.php

@@ -67,6 +67,39 @@ class ChatControllerTest extends TestCase
         $this->assertTrue($found, 'Message not found in Redis');
     }
 
+    public function test_can_send_zero_message_content(): void
+    {
+        $room = Room::create(['room_name' => 'test_send_zero']);
+        $user = User::factory()->create();
+
+        $this->actingAs($user)->get(route('chat.room', $room->id));
+
+        $response = $this->actingAs($user)->postJson(route('chat.send', $room->id), [
+            'to_user' => '大家',
+            'content' => '0',
+            'is_secret' => false,
+            'font_color' => '#000000',
+            'action' => '',
+        ]);
+
+        $response->assertOk();
+        $response->assertJson(['status' => 'success']);
+
+        $messages = Redis::lrange("room:{$room->id}:messages", 0, -1);
+        $found = false;
+
+        foreach ($messages as $msgJson) {
+            $msg = json_decode($msgJson, true);
+
+            if ($msg['from_user'] === $user->username && $msg['content'] === '0') {
+                $found = true;
+                break;
+            }
+        }
+
+        $this->assertTrue($found, 'Zero message not found in Redis');
+    }
+
     public function test_can_trigger_heartbeat()
     {
         $room = Room::create(['room_name' => 'test_hb']);