fix: 4 UI fixes for package display

1. Toman/Rial mismatch — Price from server is in Rial, now divides by 10 for correct Toman display
2. ضریب تخفیف → ضریب اعتبار label change in dialog + packages page
3. Back button already functional (ArrowForward in TitleContent) — verified
4. HTML rendering in package description via MarkupString

src/FrontOffice.Main/Shared/PackagePurchaseDialog.razor

@@ -130,7 +130,7 @@
                                     {
                                         <MudText Typo="Typo.caption" Class="mud-text-secondary"
                                                  Style="display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;">
-                                            @pkg.Description
+                                            @((MarkupString)pkg.Description)
                                         </MudText>
                                     }
                                     @* Key features *@
@@ -146,7 +146,7 @@
                                         {
                                             <MudText Typo="Typo.caption" Class="mud-text-secondary">
                                                 <MudIcon Icon="@Icons.Material.Filled.Discount" Size="Size.Small" Class="me-1" Style="font-size:.85rem;vertical-align:middle;" />
-                                                ضریب تخفیف: @pkg.DiscountMultiplier.ToString("F1")x
+                                                ضریب اعتبار: @pkg.DiscountMultiplier.ToString("F1")x
                                             </MudText>
                                         }
                                         @if (pkg.SupportsDayaPurchase)