fix: Keep draw button disabled until all draws complete

Resolve issue where the draw button becomes enabled after the first
person is drawn when drawing multiple people.

Track the number of pending draws (PendingDrawCount) and only set
status to Done after all draws have completed. Add Disabled attribute
to the button to prevent users from clicking the draw button again
while the animation is still in progress for multiple draws.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

Author: SimYunSup

src/DotNetDevLottery/Components/Random/MachineAnimation.razor

@@ -17,6 +17,7 @@
         <FluentButton
             OnClick="OnClickButton"
             Appearance="@(Status == DrawMachineStatus.Pending ? Appearance.Neutral : Appearance.Accent)"
+            Disabled="@(Status == DrawMachineStatus.Pending)"
             class="@TriggerButtonClass(Status == DrawMachineStatus.Pending)">
             추첨 진행
         </FluentButton>

src/DotNetDevLottery/Components/Random/MachineAnimation.razor.cs

@@ -37,6 +37,7 @@ public partial class MachineAnimation : ComponentBase, IAsyncDisposable
     int PersonCount = 0;
     int TargetPersonCount = 1;
     int RemainedPersonCount = 0;
+    int PendingDrawCount = 0;
     List<int> WinnedUserList = new List<int>();
     BallDesignSettings ballSettings = new();
     string BallStyleVariables => GenerateBallStyleVariables();
@@ -117,6 +118,7 @@ public async Task OnClickButton()
         }
         SelectedUserInfo = null;
         Status = DrawMachineStatus.Pending;
+        PendingDrawCount = TargetPersonCount;
         Console.WriteLine($"TargetPersonCount: {TargetPersonCount}");
         await machineUtils.InvokeVoidAsync("executeDrawBall", TargetPersonCount);
         await OnBeforeDrawMachine.InvokeAsync();
@@ -158,7 +160,12 @@ public async Task OnDrawMachineAnimationEnd()
         {
             return;
         }
-        Status = DrawMachineStatus.Done;
+        PendingDrawCount--;
+
+        if (PendingDrawCount <= 0)
+        {
+            Status = DrawMachineStatus.Done;
+        }
 
         await OnDrawAnimationEnd.InvokeAsync(new DrawAnimationEndEventArgs
         {