feat(dashboard): add owner-scoped layouts with atomic revisions

JobTrackerApi/Migrations/20261021090000_AddDashboardLayoutPreference.cs

@@ -0,0 +1,32 @@
+using JobTrackerApi.Data;
+using Microsoft.EntityFrameworkCore.Infrastructure;
+using Microsoft.EntityFrameworkCore.Migrations;
+
+#nullable disable
+
+namespace JobTrackerApi.Migrations;
+
+[DbContext(typeof(JobTrackerContext))]
+[Migration("20261021090000_AddDashboardLayoutPreference")]
+public partial class AddDashboardLayoutPreference : Migration
+{
+    protected override void Up(MigrationBuilder migrationBuilder)
+    {
+        var mysql = ActiveProvider.Contains("MySql", StringComparison.OrdinalIgnoreCase);
+        migrationBuilder.AddColumn<string>(name: "DashboardLayoutJson", table: "AspNetUsers", type: mysql ? "longtext" : "TEXT", nullable: true);
+        migrationBuilder.AddColumn<long>(name: "DashboardLayoutRevision", table: "AspNetUsers", type: mysql ? "bigint" : "INTEGER", nullable: false, defaultValue: 0L);
+    }
+
+    protected override void Down(MigrationBuilder migrationBuilder)
+    {
+        if (ActiveProvider.Contains("Sqlite", StringComparison.OrdinalIgnoreCase))
+        {
+            // These independent columns need no table rebuild (SQLite 3.35+ supports DROP COLUMN).
+            migrationBuilder.Sql("ALTER TABLE \"AspNetUsers\" DROP COLUMN \"DashboardLayoutJson\";");
+            migrationBuilder.Sql("ALTER TABLE \"AspNetUsers\" DROP COLUMN \"DashboardLayoutRevision\";");
+            return;
+        }
+        migrationBuilder.DropColumn(name: "DashboardLayoutJson", table: "AspNetUsers");
+        migrationBuilder.DropColumn(name: "DashboardLayoutRevision", table: "AspNetUsers");
+    }
+}

JobTrackerApi/Migrations/JobTrackerContextModelSnapshot.cs

@@ -485,6 +485,16 @@ namespace JobTrackerApi.Migrations
                         .HasMaxLength(16)
                         .HasColumnType("TEXT");
 
+                    b.Property<string>("DashboardLayoutJson")
+                        .HasColumnType("TEXT")
+                        .Metadata.SetAfterSaveBehavior(Microsoft.EntityFrameworkCore.Metadata.PropertySaveBehavior.Ignore);
+
+                    b.Property<long>("DashboardLayoutRevision")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("INTEGER")
+                        .HasDefaultValue(0L)
+                        .Metadata.SetAfterSaveBehavior(Microsoft.EntityFrameworkCore.Metadata.PropertySaveBehavior.Ignore);
+
                     b.Property<DateTimeOffset?>("TotpEnabledAtUtc")
                         .HasColumnType("TEXT");