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/ImageViewer.vue

@@ -25,7 +25,7 @@
         <div class="flex-1 flex items-center justify-center p-2">
           <div class="w-full h-full flex items-center justify-center">
             <img
-              :src="transformedImageUrl"
+              :src="imageUrl"
               class="max-h-[calc(100vh-5rem)] w-full h-full object-contain"
               alt="expanded shared content"
               @click="close"