Browser <-> desktop communication (#185)

* Add electron constant for browser integration

* Add constant for browser biometrics. Ensure biometry is locked on lock.

* Avoid saving keys outside desktop

* Fix eslint warning

* Add supportsSecureStorage helper to platformUtils to improve readability

src/electron/services/electronPlatformUtils.service.ts

@@ -219,4 +219,8 @@ export class ElectronPlatformUtilsService implements PlatformUtilsService {
             resolve(val);
         });
     }
+
+    supportsSecureStorage(): boolean {
+        return true;
+    }
 }