Add support for deleting event themes

This commit introduces functionality to delete event themes via the API. It includes type definitions, SDK methods, and a React Query mutation for `deleteEventTheme`. Users can perform both soft and hard deletes with this implementation.

frontend/src/client/sdk.gen.ts

@@ -31,6 +31,8 @@ import type {
   CreateEventThemeData,
   CreateEventThemeResponse,
   CreateEventThemeError,
+  DeleteEventThemeData,
+  DeleteEventThemeError,
   GetEventThemeData,
   GetEventThemeResponse,
   GetEventThemeError,
@@ -287,6 +289,29 @@ export const createEventTheme = <ThrowOnError extends boolean = false>(
   });
 };
 
+/**
+ * Delete Theme
+ * Delete specific theme by ID.
+ */
+export const deleteEventTheme = <ThrowOnError extends boolean = false>(
+  options: Options<DeleteEventThemeData, ThrowOnError>,
+) => {
+  return (options.client ?? _heyApiClient).delete<
+    unknown,
+    DeleteEventThemeError,
+    ThrowOnError
+  >({
+    security: [
+      {
+        scheme: "bearer",
+        type: "http",
+      },
+    ],
+    url: "/api/v1/event_themes/{theme_id}",
+    ...options,
+  });
+};
+
 /**
  * Get Theme
  * Get specific theme by ID.