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/ActivityListItem.vue

@@ -52,7 +52,7 @@
       <a
         class="cursor-pointer"
         data-testid="circle-info-link"
-        @click="$emit('loadClaim', record.jwtId)"
+        @click="emitLoadClaim(record.jwtId)"
       >
         <font-awesome icon="circle-info" class="fa-fw text-slate-500" />
       </a>
@@ -67,7 +67,7 @@
       >
         <a
           class="block bg-slate-100/50 backdrop-blur-md px-6 py-4 cursor-pointer"
-          @click="$emit('viewImage', record.image)"
+          @click="emitViewImage(record.image)"
         >
           <img
             class="w-full h-auto max-w-lg max-h-96 object-contain mx-auto drop-shadow-md"
@@ -80,7 +80,7 @@
 
       <!-- Description -->
       <p class="font-medium">
-        <a class="cursor-pointer" @click="$emit('loadClaim', record.jwtId)">
+        <a class="cursor-pointer" @click="emitLoadClaim(record.jwtId)">
           {{ description }}
         </a>
       </p>
@@ -248,7 +248,7 @@
 </template>
 
 <script lang="ts">
-import { Component, Prop, Vue } from "vue-facing-decorator";
+import { Component, Prop, Vue, Emit } from "vue-facing-decorator";
 import { GiveRecordWithContactInfo } from "@/interfaces/give";
 import EntityIcon from "./EntityIcon.vue";
 import { isGiveClaimType, notifyWhyCannotConfirm } from "../libs/util";
@@ -340,7 +340,19 @@ export default class ActivityListItem extends Vue {
     return true;
   }
 
-  handleConfirmClick() {
+  // Emit methods using @Emit decorator
+  @Emit("viewImage")
+  emitViewImage(imageUrl: string) {
+    return imageUrl;
+  }
+
+  @Emit("loadClaim")
+  emitLoadClaim(jwtId: string) {
+    return jwtId;
+  }
+
+  @Emit("confirmClaim")
+  emitConfirmClaim() {
     if (!this.canConfirm) {
       notifyWhyCannotConfirm(
         (msg, timeout) => this.notify.info(msg.text ?? "", timeout),
@@ -352,7 +364,11 @@ export default class ActivityListItem extends Vue {
       );
       return;
     }
-    this.$emit("confirmClaim", this.record);
+    return this.record;
+  }
+
+  handleConfirmClick() {
+    this.emitConfirmClaim();
   }
 
   get friendlyDate(): string {