Convert Vue components to use @Emit decorator instead of manual emits declarations

Replace manual emits declarations with proper @Emit decorator usage across components:
- ActivityListItem: Add @Emit methods for viewImage, loadClaim, confirmClaim
- ContactInputForm: Convert handleQRScan to use @Emit("qr-scan")
- ContactBulkActions: Add @Emit methods for toggle-all-selection, copy-selected
- ContactListHeader: Add @Emit methods for all 5 emitted events
- MembersList: Add @Emit("error") method for error handling
- LargeIdenticonModal: Add @Emit("close") method
- ContactListItem: Add @Emit methods for all 4 emitted events

Update all templates to call emit methods instead of direct $emit calls.
Fix TypeScript type issues with optional parameters.
Resolves Vue warning about undeclared emitted events.

Follows vue-facing-decorator best practices and improves code consistency.

src/components/LargeIdenticonModal.vue

@@ -7,14 +7,14 @@
         :contact="contact"
         :icon-size="512"
         class="flex w-11/12 max-w-sm mx-auto mb-3 overflow-hidden bg-white rounded-lg shadow-lg"
-        @click="$emit('close')"
+        @click="emitClose"
       />
     </div>
   </div>
 </template>
 
 <script lang="ts">
-import { Component, Vue, Prop } from "vue-facing-decorator";
+import { Component, Vue, Prop, Emit } from "vue-facing-decorator";
 import EntityIcon from "./EntityIcon.vue";
 import { Contact } from "../db/tables/contacts";
 
@@ -34,5 +34,11 @@ import { Contact } from "../db/tables/contacts";
 })
 export default class LargeIdenticonModal extends Vue {
   @Prop({ required: true }) contact!: Contact | undefined;
+
+  // Emit methods using @Emit decorator
+  @Emit("close")
+  emitClose() {
+    // No parameters needed
+  }
 }
 </script>