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/ContactListHeader.vue

@@ -8,21 +8,21 @@
           :checked="allContactsSelected"
           class="align-middle ml-2 h-6 w-6"
           data-testId="contactCheckAllTop"
-          @click="$emit('toggle-all-selection')"
+          @click="emitToggleAllSelection"
         />
         <button
           v-if="!showGiveNumbers"
           :class="copyButtonClass"
           :disabled="copyButtonDisabled"
           data-testId="copySelectedContactsButtonTop"
-          @click="$emit('copy-selected')"
+          @click="emitCopySelected"
         >
           Copy
         </button>
         <font-awesome
           icon="circle-info"
           class="text-2xl text-blue-500 ml-2"
-          @click="$emit('show-copy-info')"
+          @click="emitShowCopyInfo"
         />
       </div>
     </div>
@@ -33,7 +33,7 @@
         v-if="showGiveNumbers"
         class="text-md bg-gradient-to-b shadow-[inset_0_-1px_0_0_rgba(0,0,0,0.5)] text-white px-3 py-1.5 rounded-md"
         :class="giveAmountsButtonClass"
-        @click="$emit('toggle-give-totals')"
+        @click="emitToggleGiveTotals"
       >
         {{ giveAmountsButtonText }}
         <font-awesome icon="left-right" class="fa-fw" />
@@ -41,7 +41,7 @@
 
       <button
         class="text-md bg-gradient-to-b from-slate-400 to-slate-700 shadow-[inset_0_-1px_0_0_rgba(0,0,0,0.5)] text-white px-3 py-1.5 rounded-md"
-        @click="$emit('toggle-show-actions')"
+        @click="emitToggleShowActions"
       >
         {{ showActionsButtonText }}
       </button>
@@ -50,7 +50,7 @@
 </template>
 
 <script lang="ts">
-import { Component, Vue, Prop } from "vue-facing-decorator";
+import { Component, Vue, Prop, Emit } from "vue-facing-decorator";
 
 /**
  * ContactListHeader - Contact list header component
@@ -71,5 +71,31 @@ export default class ContactListHeader extends Vue {
   @Prop({ required: true }) giveAmountsButtonText!: string;
   @Prop({ required: true }) showActionsButtonText!: string;
   @Prop({ required: true }) giveAmountsButtonClass!: Record<string, boolean>;
+
+  // Emit methods using @Emit decorator
+  @Emit("toggle-all-selection")
+  emitToggleAllSelection() {
+    // No parameters needed
+  }
+
+  @Emit("copy-selected")
+  emitCopySelected() {
+    // No parameters needed
+  }
+
+  @Emit("show-copy-info")
+  emitShowCopyInfo() {
+    // No parameters needed
+  }
+
+  @Emit("toggle-give-totals")
+  emitToggleGiveTotals() {
+    // No parameters needed
+  }
+
+  @Emit("toggle-show-actions")
+  emitToggleShowActions() {
+    // No parameters needed
+  }
 }
 </script>