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/ContactBulkActions.vue

@@ -6,13 +6,13 @@
       :checked="allContactsSelected"
       class="align-middle ml-2 h-6 w-6"
       data-testId="contactCheckAllBottom"
-      @click="$emit('toggle-all-selection')"
+      @click="emitToggleAllSelection"
     />
     <button
       v-if="!showGiveNumbers"
       :class="copyButtonClass"
       :disabled="copyButtonDisabled"
-      @click="$emit('copy-selected')"
+      @click="emitCopySelected"
     >
       Copy
     </button>
@@ -20,7 +20,7 @@
 </template>
 
 <script lang="ts">
-import { Component, Vue, Prop } from "vue-facing-decorator";
+import { Component, Vue, Prop, Emit } from "vue-facing-decorator";
 
 /**
  * ContactBulkActions - Contact bulk actions component
@@ -38,5 +38,16 @@ export default class ContactBulkActions extends Vue {
   @Prop({ required: true }) allContactsSelected!: boolean;
   @Prop({ required: true }) copyButtonClass!: string;
   @Prop({ required: true }) copyButtonDisabled!: boolean;
+
+  // Emit methods using @Emit decorator
+  @Emit("toggle-all-selection")
+  emitToggleAllSelection() {
+    // No parameters needed
+  }
+
+  @Emit("copy-selected")
+  emitCopySelected() {
+    // No parameters needed
+  }
 }
 </script>