fix(GiftedDialog): preserve recipient when changing giver project

Modified selectProject() to only set receiver to "You" if no receiver
has been selected yet, preventing recipient from being reset when
changing giver project in Project-to-Person context.

src/components/GiftedDialog.vue

@@ -483,10 +483,13 @@ export default class GiftedDialog extends Vue {
       image: project.image,
       handleId: project.handleId,
     };
-    this.receiver = {
-      did: this.activeDid,
-      name: "You",
-    };
+    // Only set receiver to "You" if no receiver has been selected yet
+    if (!this.receiver || !this.receiver.did) {
+      this.receiver = {
+        did: this.activeDid,
+        name: "You",
+      };
+    }
     this.firstStep = false;
   }