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/test/PlatformServiceMixinTest.vue

@@ -3,16 +3,18 @@
     <h2>PlatformServiceMixin Test</h2>
     <button @click="testInsert">Test Insert</button>
     <button @click="testUpdate">Test Update</button>
-    <button
-      :class="primaryButtonClasses"
-      @click="testUserZeroSettings"
-    >
+    <button :class="primaryButtonClasses" @click="testUserZeroSettings">
       Test User #0 Settings
     </button>
 
-    <div v-if="userZeroTestResult" class="mt-4 p-4 border border-gray-300 rounded-md bg-gray-50">
+    <div
+      v-if="userZeroTestResult"
+      class="mt-4 p-4 border border-gray-300 rounded-md bg-gray-50"
+    >
       <h4 class="font-semibold mb-2">User #0 Settings Test Result:</h4>
-      <pre class="text-sm">{{ JSON.stringify(userZeroTestResult, null, 2) }}</pre>
+      <pre class="text-sm">{{
+        JSON.stringify(userZeroTestResult, null, 2)
+      }}</pre>
     </div>
     <pre>{{ result }}</pre>
   </div>
@@ -55,16 +57,16 @@ export default class PlatformServiceMixinTest extends Vue {
     try {
       // User #0's DID
       const userZeroDid = "did:ethr:0x0000694B58C2cC69658993A90D3840C560f2F51F";
-      
+
       this.result = "Testing User #0 settings...";
-      
+
       // Test the debug methods
       await this.$debugMergedSettings(userZeroDid);
-      
+
       // Get the actual settings
       const didSettings = await this.$debugDidSettings(userZeroDid);
       const accountSettings = await this.$accountSettings(userZeroDid);
-      
+
       this.userZeroTestResult = {
         didSettings,
         accountSettings,
@@ -72,7 +74,7 @@ export default class PlatformServiceMixinTest extends Vue {
         firstName: accountSettings.firstName,
         timestamp: new Date().toISOString(),
       };
-      
+
       this.result = `User #0 settings test completed. isRegistered: ${accountSettings.isRegistered}`;
     } catch (error) {
       this.result = `Error testing User #0 settings: ${error}`;