Refactor: eliminate "special" entity type and use DID-based logic

Replace string-based entity type matching with DID-based logic for "You" and "Unnamed" entities. Treat these as regular person entities instead of special types.

- Remove "special" type from EntitySelectionEvent interface
- Update EntityGrid to emit "You" and "Unnamed" as person entities
- Simplify SpecialEntityCard emit structure (remove entityType parameter)
- Refactor GiftedDialog to process all person entities with DID-based logic
- Update ContactGiftingView and HomeView to use DID-based entity creation
- Remove string literals "You" and "Unnamed" from method signatures

src/components/EntityGrid.vue

@@ -310,16 +310,13 @@ export default class EntityGrid extends Vue {
 
   /**
    * Handle special entity selection from SpecialEntityCard
+   * Treat "You" and "Unnamed" as person entities
    */
-  handleEntitySelected(event: {
-    type: string;
-    entityType: string;
-    data: { did?: string; name: string };
-  }): void {
+  handleEntitySelected(event: { data: { did?: string; name: string } }): void {
+    // Convert special entities to person entities since they represent people
     this.emitEntitySelected({
-      type: "special",
-      entityType: event.entityType,
-      data: event.data,
+      type: "person",
+      data: event.data as Contact,
     });
   }
 
@@ -327,13 +324,11 @@ export default class EntityGrid extends Vue {
 
   @Emit("entity-selected")
   emitEntitySelected(data: {
-    type: "person" | "project" | "special";
-    entityType?: string;
-    data: Contact | PlanData | { did?: string; name: string };
+    type: "person" | "project";
+    data: Contact | PlanData;
   }): {
-    type: "person" | "project" | "special";
-    entityType?: string;
-    data: Contact | PlanData | { did?: string; name: string };
+    type: "person" | "project";
+    data: Contact | PlanData;
   } {
     return data;
   }