refactor: improve router type safety and usage

- Add explicit Router type imports across views
- Replace $router type casting with proper typing
- Use $router.back() instead of $router.go(-1) for consistency
- Add proper route and router typings to components
- Clean up router navigation methods
- Fix router push/back method calls

This commit improves type safety and consistency in router usage across
the application's view components.

src/components/OnboardingDialog.vue

@@ -219,6 +219,7 @@ import { OnboardPage } from "../libs/util";
 })
 export default class OnboardingDialog extends Vue {
   $notify!: (notification: NotificationIface, timeout?: number) => void;
+  $router!: Router;
 
   activeDid = "";
   firstContactName = null;
@@ -254,7 +255,7 @@ export default class OnboardingDialog extends Vue {
         finishedOnboarding: true,
       });
       if (goHome) {
-        (this.$router as Router).push({ name: "home" });
+        this.$router.push({ name: "home" });
       }
     }
   }