fix(ios): fix comment delete — use fetchVoid for 204 No Content response

ios/LibNovel/LibNovel/Networking/APIClient.swift

@@ -90,6 +90,19 @@ actor APIClient {
         }
     }
 
+    /// Like `fetch` but discards the response body — use for endpoints that return 204 No Content.
+    func fetchVoid(_ path: String, method: String = "GET", body: Encodable? = nil) async throws {
+        let req = try makeRequest(path, method: method, body: body)
+        let (data, response) = try await session.data(for: req)
+        guard let http = response as? HTTPURLResponse else {
+            throw APIError.invalidResponse
+        }
+        guard (200..<300).contains(http.statusCode) else {
+            let rawBody = String(data: data, encoding: .utf8) ?? "<non-utf8 data, \(data.count) bytes>"
+            throw APIError.httpError(http.statusCode, rawBody)
+        }
+    }
+
     // MARK: - Auth
 
     struct LoginRequest: Encodable {
@@ -347,8 +360,7 @@ actor APIClient {
 
     /// Delete a comment (and its replies) by ID. Only the owner can delete.
     func deleteComment(commentId: String) async throws {
-        struct Empty: Decodable {}
-        let _: Empty = try await fetch("/api/comment/\(commentId)", method: "DELETE")
+        try await fetchVoid("/api/comment/\(commentId)", method: "DELETE")
     }
 }