Checkpoint web-player design-system refactor and backend track genre tagging

Advances the ongoing token/componentization cleanup (anchored player dock,
border-based panels instead of floating shadows, corrected light-mode
accent/gradient tokens) alongside in-progress backend support for track
genre tags.

backend/Core/Musify.Infrastructure/Persistence/Migrations/DatabaseModelSnapshot.cs

@@ -3,6 +3,7 @@ using System;
 using Microsoft.EntityFrameworkCore;
 using Microsoft.EntityFrameworkCore.Infrastructure;
 using Microsoft.EntityFrameworkCore.Storage.ValueConversion;
+using Musify.Domain.ValueObjects;
 using Musify.Infrastructure.Persistence;
 using Npgsql.EntityFrameworkCore.PostgreSQL.Metadata;
 
@@ -20,6 +21,7 @@ namespace Musify.Infrastructure.Persistence.Migrations
                 .HasAnnotation("ProductVersion", "10.0.8")
                 .HasAnnotation("Relational:MaxIdentifierLength", 63);
 
+            NpgsqlModelBuilderExtensions.HasPostgresEnum(modelBuilder, "genre", new[] { "ambient", "blues", "classical", "country", "drum_and_bass", "dubstep", "electronic", "folk", "funk", "hip_hop", "house", "indie", "jazz", "k_pop", "latin", "lofi", "metal", "pop", "punk", "reggae", "reggaeton", "rn_b", "rock", "soul", "techno", "trance" });
             NpgsqlModelBuilderExtensions.UseIdentityByDefaultColumns(modelBuilder);
 
             modelBuilder.Entity("MassTransit.EntityFrameworkCoreIntegration.InboxState", b =>
@@ -476,6 +478,26 @@ namespace Musify.Infrastructure.Persistence.Migrations
                     b.ToTable("TrackLikes");
                 });
 
+            modelBuilder.Entity("Musify.Domain.Entities.TrackTag", b =>
+                {
+                    b.Property<Guid>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("uuid");
+
+                    b.Property<Genre>("Tag")
+                        .HasColumnType("genre");
+
+                    b.Property<Guid>("TrackId")
+                        .HasColumnType("uuid");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("TrackId", "Tag")
+                        .IsUnique();
+
+                    b.ToTable("TrackTags");
+                });
+
             modelBuilder.Entity("Musify.Domain.Entities.Upload", b =>
                 {
                     b.Property<Guid>("Id")
@@ -1041,6 +1063,17 @@ namespace Musify.Infrastructure.Persistence.Migrations
                     b.Navigation("User");
                 });
 
+            modelBuilder.Entity("Musify.Domain.Entities.TrackTag", b =>
+                {
+                    b.HasOne("Musify.Domain.Entities.Track", "Track")
+                        .WithMany("Tags")
+                        .HasForeignKey("TrackId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.Navigation("Track");
+                });
+
             modelBuilder.Entity("Musify.Domain.Entities.UploadIntent", b =>
                 {
                     b.HasOne("Musify.Domain.Entities.User", "User")
@@ -1113,6 +1146,8 @@ namespace Musify.Infrastructure.Persistence.Migrations
 
                     b.Navigation("PlayListTracks");
 
+                    b.Navigation("Tags");
+
                     b.Navigation("UserTracks");
                 });