Add custom theme deletion flow

Wino.Core.Domain/Interfaces/INewThemeService.cs

@@ -15,6 +15,7 @@ public interface INewThemeService : IInitializeAsync
     Task<List<AppThemeBase>> GetAvailableThemesAsync();
     Task<CustomThemeMetadata> CreateNewCustomThemeAsync(string themeName, string accentColor, byte[] wallpaperData);
     Task<List<CustomThemeMetadata>> GetCurrentCustomThemesAsync();
+    Task<bool> DeleteCustomThemeAsync(Guid themeId);
     List<string> GetAvailableAccountColors();
     Task ApplyCustomThemeAsync(bool isInitializing);
 

Wino.Core.Domain/Translations/en_US/resources.json

@@ -807,6 +807,10 @@
     "SettingsConfigureSpecialFolders_Description": "Set folders with special functions. Folders such as Archive, Inbox, and Drafts are essential for Wino to function properly.",
     "SettingsConfigureSpecialFolders_Title": "Configure System Folders",
     "SettingsCustomTheme_Description": "Create your own custom theme with custom wallpaper and accent color.",
+    "SettingsCustomTheme_DeleteConfirm_Message": "Delete custom theme \"{0}\"? Its saved wallpaper will also be removed from disk.",
+    "SettingsCustomTheme_DeleteConfirm_Title": "Delete Theme",
+    "SettingsCustomTheme_DeleteMissing": "This custom theme no longer exists.",
+    "SettingsCustomTheme_DeleteSuccess": "Custom theme \"{0}\" was deleted.",
     "SettingsCustomTheme_Title": "Custom Theme",
     "SettingsDeleteAccount_Description": "Delete all e-mails and credentials associated with this account.",
     "SettingsDeleteAccount_Title": "Delete this account",