Fix HomeView notification migration to use proper constants pattern

- Add NOTIFY_CONTACT_LOADING_ISSUE, NOTIFY_FEED_LOADING_ISSUE, and NOTIFY_CONFIRMATION_ERROR constants to notifications.ts
- Update HomeView.vue to import and use notification constants instead of literal strings
- Update migration templates to document constants vs literal strings pattern
- Add comprehensive documentation for notification constants usage

Ensures consistency with established pattern used in ActivityListItem.vue and other migrated components. Linter passes without errors.

src/components/ActivityListItem.vue

@@ -259,7 +259,10 @@ import {
 import { containsHiddenDid, isHiddenDid } from "../libs/endorserServer";
 import ProjectIcon from "./ProjectIcon.vue";
 import { createNotifyHelpers } from "@/utils/notify";
-import { NOTIFY_PERSON_HIDDEN, NOTIFY_UNKNOWN_PERSON } from "@/constants/notifications";
+import {
+  NOTIFY_PERSON_HIDDEN,
+  NOTIFY_UNKNOWN_PERSON,
+} from "@/constants/notifications";
 import { TIMEOUTS } from "@/utils/notify";
 
 @Component({
@@ -284,17 +287,11 @@ export default class ActivityListItem extends Vue {
   }
 
   notifyHiddenPerson() {
-    this.notify.warning(
-      NOTIFY_PERSON_HIDDEN.message,
-      TIMEOUTS.STANDARD,
-    );
+    this.notify.warning(NOTIFY_PERSON_HIDDEN.message, TIMEOUTS.STANDARD);
   }
 
   notifyUnknownPerson() {
-    this.notify.warning(
-      NOTIFY_UNKNOWN_PERSON.message,
-      TIMEOUTS.STANDARD,
-    );
+    this.notify.warning(NOTIFY_UNKNOWN_PERSON.message, TIMEOUTS.STANDARD);
   }
 
   @Emit()
@@ -340,7 +337,7 @@ export default class ActivityListItem extends Vue {
   handleConfirmClick() {
     if (!this.canConfirm) {
       notifyWhyCannotConfirm(
-        (msg, timeout) => this.notify.info(msg.text ?? '', timeout),
+        (msg, timeout) => this.notify.info(msg.text ?? "", timeout),
         this.isRegistered,
         this.record.fullClaim?.["@type"],
         this.record,