fix: Resolve Option unwrapping and remove unused import

This commit addresses two issues:
1. Safely unwrap Option<ContractContainer> by using map_or() with a default empty vector
2. Remove unused import of owner_vk_to_contract_key from get_response.rs

Author: sanity

ui/src/components/app/freenet_api/response_handler.rs

@@ -45,7 +45,7 @@ impl ResponseHandler {
             HostResponse::ContractResponse(contract_response) => {
                 match contract_response {
                     ContractResponse::GetResponse { key, contract, state } => {
-                        handle_get_response(&mut self.room_synchronizer, key, contract.to_vec(), state.to_vec()).await?;
+                        handle_get_response(&mut self.room_synchronizer, key, contract.map_or(Vec::new(), |c| c.to_vec()), state.to_vec()).await?;
                     }
                     ContractResponse::PutResponse { key } => {
                         handle_put_response(&mut self.room_synchronizer, key).await?;

ui/src/components/app/freenet_api/response_handler/get_response.rs

@@ -4,7 +4,7 @@ use crate::components::app::sync_info::{RoomSyncStatus, SYNC_INFO};
 use crate::components::app::{CURRENT_ROOM, PENDING_INVITES, ROOMS};
 use crate::invites::PendingRoomStatus;
 use crate::room_data::RoomData;
-use crate::util::{from_cbor_slice, owner_vk_to_contract_key};
+use crate::util::from_cbor_slice;
 use dioxus::logger::tracing::{error, info};
 use dioxus::prelude::Readable;
 use freenet_scaffold::ComposableState;