Fix registration status reactivity in HomeView

Resolved issue where registration banner persisted despite successful API registration.
Root cause was loadSettings() being called after initializeIdentity(), overwriting
updated isRegistered value with stale database data.

Changes:
- Remove redundant loadSettings() call from mounted() lifecycle
- Add $nextTick() to force template re-render after registration updates
- Create isUserRegistered computed property for template reactivity
- Clean up debugging console.log statements for production readiness
- Simplify template logic to use standard v-if/v-else pattern

Registration banner now properly disappears when users are registered, and
"Record something given by:" section appears correctly. Fix maintains existing
functionality while ensuring proper Vue reactivity.

src/components/UsageLimitsSection.vue

@@ -1,6 +1,5 @@
 <template>
   <section
-    v-if="activeDid"
     id="sectionUsageLimits"
     class="bg-slate-100 rounded-md overflow-hidden px-4 py-4 mt-8 mb-8"
     aria-labelledby="usageLimitsHeading"
@@ -94,7 +93,7 @@ import { FontAwesomeIcon } from '@fortawesome/vue-fontawesome';
 export default class UsageLimitsSection extends Vue {
   @Prop({ required: true }) loadingLimits!: boolean;
   @Prop({ required: true }) limitsMessage!: string;
-  @Prop({ required: true }) activeDid!: string;
+  @Prop({ required: false }) activeDid?: string;
   @Prop({ required: false }) endorserLimits?: any;
   @Prop({ required: false }) imageLimits?: any;