Add Scheduling card with expiry date field to Edit Meow form

Views/Slides/Edit.cshtml

@@ -78,6 +78,20 @@
                     </div>
                 </div>
             </div>
+            <div class="card mb-4">
+                <div class="card-header"><h5 class="mb-0">Scheduling</h5></div>
+                <div class="card-body">
+                    <div class="mb-2">
+                        <label asp-for="ExpiresAt" class="form-label">Expires</label>
+                        <input asp-for="ExpiresAt" type="datetime-local" class="form-control" />
+                        <div class="form-text">After this time the Meow is automatically skipped on displays — it stays in the library, just not shown. Leave blank for no expiry.</div>
+                    </div>
+                    @if (Model.ExpiresAt.HasValue && Model.ExpiresAt.Value <= DateTime.Now)
+                    {
+                        <span class="badge bg-danger"><i class="bi bi-clock-history me-1"></i>Expired</span>
+                    }
+                </div>
+            </div>
             <div class="d-grid gap-2">
                 <button type="submit" class="btn btn-primary btn-lg"><i class="bi bi-check-lg me-1"></i>Save Changes</button>
                 <a href="/admin/slides" class="btn btn-outline-secondary">Cancel</a>