Feature: giver-recipient validation

- Ensures person-to-person gifting won't allow the same entity as giver and recipient
- Disable user item selection if it would create conflict
- Error messaging fallback

src/components/GiftedDialog.vue

@@ -80,16 +80,29 @@
                 stepType === 'recipient' ||
                 (stepType === 'giver' && isFromProjectView)
               "
-              class="cursor-pointer"
+              :class="{
+                'cursor-pointer': !wouldCreateConflict(activeDid),
+                'cursor-not-allowed opacity-50': wouldCreateConflict(activeDid)
+              }"
               @click="
-                stepType === 'recipient'
+                !wouldCreateConflict(activeDid) &&
+                (stepType === 'recipient'
                   ? selectRecipient({ did: activeDid, name: 'You' })
-                  : selectGiver({ did: activeDid, name: 'You' })
+                  : selectGiver({ did: activeDid, name: 'You' }))
               "
             >
-              <font-awesome icon="hand" class="text-blue-500 text-5xl mb-1" />
+              <font-awesome 
+                :class="{
+                  'text-blue-500 text-5xl mb-1': !wouldCreateConflict(activeDid),
+                  'text-slate-400 text-5xl mb-1': wouldCreateConflict(activeDid)
+                }" 
+                icon="hand" 
+              />
               <h3
-                class="text-xs text-blue-500 font-medium text-ellipsis whitespace-nowrap overflow-hidden"
+                :class="{
+                  'text-xs text-blue-500 font-medium text-ellipsis whitespace-nowrap overflow-hidden': !wouldCreateConflict(activeDid),
+                  'text-xs text-slate-400 font-medium text-ellipsis whitespace-nowrap overflow-hidden': wouldCreateConflict(activeDid)
+                }"
               >
                 You
               </h3>
@@ -119,11 +132,15 @@
             <li
               v-for="contact in allContacts.slice(0, 10)"
               :key="contact.did"
-              class="cursor-pointer"
+              :class="{
+                'cursor-pointer': !wouldCreateConflict(contact.did),
+                'cursor-not-allowed opacity-50': wouldCreateConflict(contact.did)
+              }"
               @click="
-                stepType === 'recipient'
+                !wouldCreateConflict(contact.did) &&
+                (stepType === 'recipient'
                   ? selectRecipient(contact)
-                  : selectGiver(contact)
+                  : selectGiver(contact))
               "
             >
               <div class="relative w-fit mx-auto">
@@ -141,7 +158,10 @@
                 </div>
               </div>
               <h3
-                class="text-xs font-medium text-ellipsis whitespace-nowrap overflow-hidden"
+                :class="{
+                  'text-xs font-medium text-ellipsis whitespace-nowrap overflow-hidden': !wouldCreateConflict(contact.did),
+                  'text-xs font-medium text-ellipsis whitespace-nowrap overflow-hidden text-slate-400': wouldCreateConflict(contact.did)
+                }"
               >
                 {{ contact.name || contact.did }}
               </h3>
@@ -425,9 +445,22 @@
             @click="explainData()"
           />
         </p>
+        
+        <!-- Conflict warning -->
+        <div v-if="hasPersonConflict" class="mb-4 p-3 bg-red-50 border border-red-200 rounded-md">
+          <p class="text-red-700 text-sm text-center">
+            <font-awesome icon="exclamation-triangle" class="fa-fw mr-1" />
+            Cannot record: Same person selected as both giver and recipient
+          </p>
+        </div>
+        
         <div class="grid grid-cols-1 sm:grid-cols-2 gap-2">
           <button
-            class="block w-full text-center text-md uppercase font-bold bg-gradient-to-b from-blue-400 to-blue-700 shadow-[inset_0_-1px_0_0_rgba(0,0,0,0.5)] text-white px-1.5 py-2 rounded-lg"
+            :disabled="hasPersonConflict"
+            :class="{
+              'block w-full text-center text-md uppercase font-bold bg-gradient-to-b from-blue-400 to-blue-700 shadow-[inset_0_-1px_0_0_rgba(0,0,0,0.5)] text-white px-1.5 py-2 rounded-lg': !hasPersonConflict,
+              'block w-full text-center text-md uppercase font-bold bg-gradient-to-b from-slate-300 to-slate-500 shadow-[inset_0_-1px_0_0_rgba(0,0,0,0.5)] text-slate-400 px-1.5 py-2 rounded-lg cursor-not-allowed': hasPersonConflict
+            }"
             @click="confirm"
           >
             Sign &amp; Send
@@ -525,6 +558,39 @@ export default class GiftedDialog extends Vue {
     return result;
   }
 
+  // Computed property to check if current selection would create a conflict
+  get hasPersonConflict() {
+    // Only check for conflicts when both entities are persons
+    if (this.giverEntityType !== "person" || this.recipientEntityType !== "person") {
+      return false;
+    }
+    
+    // Check if giver and recipient are the same person
+    if (this.giver?.did && this.receiver?.did && this.giver.did === this.receiver.did) {
+      return true;
+    }
+    
+    return false;
+  }
+
+  // Computed property to check if a contact would create a conflict when selected
+  wouldCreateConflict(contactDid: string) {
+    // Only check for conflicts when both entities are persons
+    if (this.giverEntityType !== "person" || this.recipientEntityType !== "person") {
+      return false;
+    }
+    
+    if (this.stepType === "giver") {
+      // If selecting as giver, check if it conflicts with current recipient
+      return this.receiver?.did === contactDid;
+    } else if (this.stepType === "recipient") {
+      // If selecting as recipient, check if it conflicts with current giver
+      return this.giver?.did === contactDid;
+    }
+    
+    return false;
+  }
+
   stepType = "giver";
   giverEntityType = "person" as "person" | "project";
   recipientEntityType = "person" as "person" | "project";
@@ -705,6 +771,20 @@ export default class GiftedDialog extends Vue {
       );
       return;
     }
+    
+    // Check for person conflict
+    if (this.hasPersonConflict) {
+      this.$notify(
+        {
+          group: "alert",
+          type: "danger",
+          title: "Error",
+          text: "You cannot select the same person as both giver and recipient.",
+        },
+        3000,
+      );
+      return;
+    }
 
     this.close();
     this.$notify(