feat(frontend+backend): add theming to the blazor frontend

frontend/Models/Schedule.cs

@@ -0,0 +1,18 @@
+namespace NimbusFlow.Frontend.Models;
+
+public class Schedule
+{
+    public int ScheduleId { get; set; }
+    public int ServiceId { get; set; }
+    public int MemberId { get; set; }
+    public string Status { get; set; } = string.Empty; // pending, accepted, declined
+    public DateTime ScheduledAt { get; set; }
+    public DateTime? AcceptedAt { get; set; }
+    public DateTime? DeclinedAt { get; set; }
+    public DateTime? ExpiresAt { get; set; }
+    public string? DeclineReason { get; set; }
+
+    // Navigation properties
+    public Member? Member { get; set; }
+    public Service? Service { get; set; }
+}