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/ContactInputForm.vue

@@ -64,7 +64,7 @@
 </template>
 
 <script lang="ts">
-import { Component, Vue, Prop } from "vue-facing-decorator";
+import { Component, Vue, Prop, Emit } from "vue-facing-decorator";
 
 /**
  * ContactInputForm - Contact input form component
@@ -165,9 +165,9 @@ export default class ContactInputForm extends Vue {
    * Handle QR scan button click
    * Emits qr-scan event for parent handling
    */
+  @Emit("qr-scan")
   private handleQRScan(): void {
     console.log("[ContactInputForm] QR scan button clicked");
-    this.$emit("qr-scan");
   }
 }
 </script>