fix(core): even more graceful close

packages/core/src/network/client.ts

@@ -308,7 +308,7 @@ export class MtClient extends EventEmitter {
     emitError(err: unknown): void {
         if (this._emitError) {
             this._emitError(err)
-        } else {
+        } else if (this._connect.finished()) {
             this.log.error('unhandled error:', err)
         }
     }

packages/core/src/network/network-manager.ts

@@ -879,6 +879,7 @@ export class NetworkManager {
         for (const dc of this._dcConnections.values()) {
             await dc.destroy()
         }
+        this._dcConnections.clear()
         this.config.offReload(this._onConfigChanged)
         this._resetOnNetworkChange?.()
     }