refactor: return TotalHoursPlayed as double in GetTestersUseCase

Simplifies backend logic by returning TotalHoursPlayed in decimal hours instead of a formatted string.
Delegates the display formatting to the client, avoiding rounding issues and making the API more flexible.

Author: DevD4v3

src/UseCases/Testers/GetAll.cs

@@ -9,7 +9,7 @@ public class GetTestersResponse
 {
     public required string Name { get; init; }
     public required string AccessKey { get; init; }
-    public required string TotalPlaytime { get; init; }
+    public required double TotalHoursPlayed { get; init; }
     public required string CreatedAt { get; init; }
 }
 
@@ -23,7 +23,7 @@ public async Task<ListedResult<GetTestersResponse>> ExecuteAsync()
             {
                 Name = t.Name,
                 AccessKey = t.AccessKey,
-                TotalPlaytime = TimeSpan.FromHours(t.TotalHoursPlayed).ToString(@"hh\:mm\:ss"),
+                TotalHoursPlayed = t.TotalHoursPlayed,
                 CreatedAt = t.CreatedAt.ToString("yyyy-MM-dd HH:mm:ss")
             })
             .ToListAsync();

tests/UseCases/Testers/GetAll.cs

@@ -36,7 +36,7 @@ public async Task Get_WhenTestersExist_ShouldReturnAllTesters()
     }
 
     [Test]
-    public async Task Get_WhenTesterHasPlaytime_ShouldReturnFormattedPlaytime()
+    public async Task Get_WhenTesterHasPlaytime_ShouldReturnTotalHoursPlayed()
     {
         // Arrange
         var client = CreateHttpClientWithApiKey();
@@ -45,11 +45,10 @@ public async Task Get_WhenTesterHasPlaytime_ShouldReturnFormattedPlaytime()
         var createdBody = await createResponse.Content.ReadFromJsonAsync<Result<CreateTesterResponse>>();
         var accessKey = createdBody.Data.AccessKey;
 
-        // Update playtime (for example 2.75 hours = 02:45:00)
         var playtimeRequest = new UpdatePlaytimeRequest(HoursPlayed: 2.75);
         var requestUri = $"/api/testers/{accessKey}/playtime";
         var playtimeResponse = await client.PatchAsJsonAsync(requestUri, playtimeRequest);
-        var expectedPlaytime = "02:45:00";
+        double expectedTotalHours = 2.75f;
 
         // Act
         var response = await client.GetAsync("/api/testers");
@@ -62,7 +61,7 @@ public async Task Get_WhenTesterHasPlaytime_ShouldReturnFormattedPlaytime()
         body.IsSuccess.Should().BeTrue();
 
         var tester = body.Data.FirstOrDefault(t => t.Name == "Carlos");
-        tester.TotalPlaytime.Should().Be(expectedPlaytime);
+        tester.TotalHoursPlayed.Should().Be(expectedTotalHours);
     }
 
     [Test]