Chore: convert "unnamed" into constant

- "Unnamed/Unknown" simplified into just "Unnamed"
- Phrase variations have their own constants

src/components/GiftedDialog.vue

@@ -88,6 +88,7 @@ import {
   NOTIFY_GIFTED_DETAILS_NO_IDENTIFIER,
   NOTIFY_GIFTED_DETAILS_RECORDING_GIVE,
 } from "@/constants/notifications";
+import { UNNAMED_ENTITY_NAME } from "@/constants/entities";
 
 @Component({
   components: {
@@ -457,7 +458,7 @@ export default class GiftedDialog extends Vue {
       if (!this.giver || !this.giver.did) {
         this.giver = {
           did: "",
-          name: "Unnamed",
+          name: UNNAMED_ENTITY_NAME,
         };
       }
     }
@@ -519,7 +520,7 @@ export default class GiftedDialog extends Vue {
       if (!this.receiver || !this.receiver.did) {
         this.receiver = {
           did: "",
-          name: "Unnamed",
+          name: UNNAMED_ENTITY_NAME,
         };
       }
     }
@@ -596,7 +597,7 @@ export default class GiftedDialog extends Vue {
       return { ...contact, name: "You" };
     } else if (!contact.did || contact.did === "") {
       // If DID is empty/null, create "Unnamed" entity
-      return { ...contact, name: "Unnamed" };
+      return { ...contact, name: UNNAMED_ENTITY_NAME };
     } else {
       // Return the contact as-is
       return contact;