fix: warn user when IDE cannot save the sketch

Happens when the IDE2 backend process crashes, and the communication
drops between the client and the server.

Closes #2081

Signed-off-by: Akos Kitta <a.kitta@arduino.cc>

arduino-ide-extension/src/browser/contributions/contribution.ts

@@ -68,6 +68,7 @@ import { MainMenuManager } from '../../common/main-menu-manager';
 import { ConfigServiceClient } from '../config/config-service-client';
 import { ApplicationShell } from '@theia/core/lib/browser/shell/application-shell';
 import { DialogService } from '../dialog-service';
+import { ApplicationConnectionStatusContribution } from '../theia/core/connection-status-service';
 
 export {
   Command,
@@ -172,6 +173,9 @@ export abstract class SketchContribution extends Contribution {
   @inject(EnvVariablesServer)
   protected readonly envVariableServer: EnvVariablesServer;
 
+  @inject(ApplicationConnectionStatusContribution)
+  protected readonly connectionStatusService: ApplicationConnectionStatusContribution;
+
   protected async sourceOverride(): Promise<Record<string, string>> {
     const override: Record<string, string> = {};
     const sketch = await this.sketchServiceClient.currentSketch();