Add shared pagination, projections and ownership helpers; simplify query and command handlers

backend/Hosts/Musify.Api/Endpoints/AlbumEndpoints.cs

@@ -25,7 +25,7 @@ public static class AlbumEndpoints
             .AddEndpointFilter<ValidationFilter<PageQuery>>()
             .WithName("GetAlbums")
             .WithSummary("Get Paginated Albums, Optionally Filtered By Title.")
-            .Produces<AlbumsSearchResponse>();
+            .Produces<PaginatedResponse<AlbumApplicationResponse>>();
 
         group.MapGet("/{id}", GetAlbumById)
             .WithName("GetAlbumById")
@@ -129,7 +129,7 @@ public static class AlbumEndpoints
         [AsParameters] PageQuery page)
     {
         var result = await mediator.Send(new GetAlbumsQuery(title, page.PageNumber, page.PageSize), cancellationToken);
-        return result.ToHttpResult();
+        return Results.Ok(result);
     }
 
     private static async Task<IResult> GetAlbumById(
@@ -166,7 +166,7 @@ public static class AlbumEndpoints
         }
 
         var result = await mediator.Send(new GetRecentlyListenedAlbumsQuery(currentUser.RequiredId, limit), cancellationToken);
-        return result.ToHttpResult();
+        return Results.Ok(result);
     }
 
     private static async Task<IResult> GetAlbumTracks(

backend/Hosts/Musify.Api/Endpoints/GenreEndpoints.cs

@@ -1,5 +1,6 @@
 using Mediator;
 using Musify.Application.Genres;
+using Musify.Application.Genres.Responses;
 
 namespace Musify.Api.Endpoints;
 

backend/Hosts/Musify.Api/Endpoints/LikeEndpoints.cs

@@ -42,7 +42,7 @@ public static class LikeEndpoints
         [AsParameters] PageQuery page)
     {
         var result = await mediator.Send(new GetLikedTracksQuery(currentUser.RequiredId, page.PageNumber, page.PageSize), cancellationToken);
-        return result.ToHttpResult();
+        return Results.Ok(result);
     }
 
     private static async Task<IResult> ToggleTrackLike(

backend/Hosts/Musify.Api/Endpoints/MixEndpoints.cs

@@ -36,7 +36,7 @@ public static class MixEndpoints
         CancellationToken cancellationToken)
     {
         var result = await mediator.Send(new GetMixesByUserIdQuery(currentUser.RequiredId), cancellationToken);
-        return result.ToHttpResult();
+        return Results.Ok(result);
     }
 
     private static async Task<IResult> GetMixById(

backend/Hosts/Musify.Api/Endpoints/PlayListEndpoints.cs

@@ -126,7 +126,7 @@ public static class PlayListEndpoints
         [AsParameters] PageQuery page)
     {
         var result = await mediator.Send(new GetPlayListsByUserIdQuery(userId, name, page.PageNumber, page.PageSize, currentUser.Id), cancellationToken);
-        return result.ToHttpResult();
+        return Results.Ok(result);
     }
 
     private static async Task<IResult> GetPlayListTracks(

backend/Hosts/Musify.Api/Endpoints/TrackEndpoints.cs

@@ -23,7 +23,7 @@ public static class TrackEndpoints
             .AddEndpointFilter<ValidationFilter<PageQuery>>()
             .WithName("GetTracks")
             .WithSummary("Get Paginated Tracks, Optionally Filtered By Name And Genre.")
-            .Produces<TracksSearchResponse>()
+            .Produces<PaginatedResponse<TrackApplicationResponse>>()
             .ProducesValidationProblem();
 
         group.MapGet("/{id}", GetTrackById)
@@ -116,7 +116,7 @@ public static class TrackEndpoints
         }
 
         var result = await mediator.Send(new GetTracksQuery(name, page.PageNumber, page.PageSize, parsedGenre), cancellationToken);
-        return result.ToHttpResult();
+        return Results.Ok(result);
     }
 
     private static async Task<IResult> GetTrackById(

backend/Hosts/Musify.Api/Endpoints/UserEndpoints.cs

@@ -105,7 +105,7 @@ public static class UserEndpoints
         [AsParameters] PageQuery page)
     {
         var result = await mediator.Send(new GetUsersQuery(page.PageNumber, page.PageSize, usernameSearch, currentUser.Id), cancellationToken);
-        return result.ToHttpResult();
+        return Results.Ok(result);
     }
 
     private static async Task<IResult> GetUserById(