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/views/IdentitySwitcherView.vue

@@ -22,7 +22,10 @@
       v-if="activeDid && !activeDidInIdentities"
       class="block bg-slate-100 rounded-md flex items-center px-4 py-3 mb-4"
     >
-      <font-awesome icon="circle-check" class="fa-fw text-red-600 text-xl mr-3"></font-awesome>
+      <font-awesome
+        icon="circle-check"
+        class="fa-fw text-red-600 text-xl mr-3"
+      ></font-awesome>
       <div class="text-sm text-slate-500">
         <div class="overflow-hidden truncate">
           <b>ID:</b> <code>{{ activeDid }}</code>
@@ -114,6 +117,7 @@ import { retrieveAllAccountsMetadata } from "../libs/util";
 @Component({ components: { QuickNav } })
 export default class IdentitySwitcherView extends Vue {
   $notify!: (notification: NotificationIface, timeout?: number) => void;
+  $router!: Router;
 
   public activeDid = "";
   public activeDidInIdentities = false;
@@ -131,7 +135,10 @@ export default class IdentitySwitcherView extends Vue {
       const accounts = await retrieveAllAccountsMetadata();
       for (let n = 0; n < accounts.length; n++) {
         const acct = accounts[n];
-        this.otherIdentities.push({ id: acct.id as string, did: acct.did });
+        this.otherIdentities.push({
+          id: (acct.id ?? 0).toString(),
+          did: acct.did,
+        });
         if (acct.did && this.activeDid === acct.did) {
           this.activeDidInIdentities = true;
         }
@@ -159,7 +166,7 @@ export default class IdentitySwitcherView extends Vue {
     await db.settings.update(MASTER_SETTINGS_KEY, {
       activeDid: did,
     });
-    (this.$router as Router).push({ name: "account" });
+    this.$router.push({ name: "account" });
   }
 
   async deleteAccount(id: string) {