feat: add onSignOut bridge hook

app/assets/javascripts/services/bridge.ts

@@ -17,6 +17,7 @@ export interface Bridge {
   syncComponents(payloads: unknown[]): void;
   onMajorDataChange(): void;
   onInitialDataLoad(): void;
+  onSignOut(): void;
   onSearch(text?: string): void;
   downloadBackup(): void | Promise<void>;
 }

app/assets/javascripts/services/browserBridge.ts

@@ -30,4 +30,5 @@ export class BrowserBridge implements Bridge {
   onInitialDataLoad(): void {}
   onSearch(): void {}
   downloadBackup(): void {}
+  onSignOut(): void {}
 }