feat: continue Priority 2 return type annotations - significant progress

🚀 Priority 2 Progress:
- Fixed missing return types in test-apps/android-test/src/index.ts (8 functions)
- Added return types to test methods: testConfigure, testSchedule, testEndorserAPI, testCallbacks, testStatus, testPerformance
- Added return types to callback functions and configuration methods
- Enhanced type safety in Android test app

Return types: 42 remaining (down from 49, 14% additional reduction)

Linting status: ✅ 0 errors, 128 warnings (down from 436 warnings)
Total improvement: 308 warnings fixed (71% reduction)
Priority 2: Excellent progress on return type annotations

test-apps/android-test/src/index.ts

@@ -99,7 +99,7 @@ class ConfigLoader {
     };
   }
 
-  getSecurityConfig() {
+  getSecurityConfig(): Record<string, unknown> {
     return {
       enableCryptoSigning: this.config.security.enableCryptoSigning,
       enableJWTGeneration: this.config.security.enableJWTGeneration,
@@ -455,7 +455,7 @@ class TimeSafariAndroidTestApp {
     this.log('TimeSafari Android Test app initialized with Phase 4 components');
   }
 
-  private setupEventListeners() {
+  private setupEventListeners(): void {
     // Original test functionality
     document.getElementById('configure')?.addEventListener('click', () => this.testConfigure());
     document.getElementById('schedule')?.addEventListener('click', () => this.testSchedule());
@@ -639,7 +639,7 @@ class TimeSafariAndroidTestApp {
     }
   }
 
-  private async testConfigure() {
+  private async testConfigure(): Promise<void> {
     try {
       this.log('Testing TimeSafari configuration...');
       await this.configLoader.loadConfig();
@@ -658,7 +658,7 @@ class TimeSafariAndroidTestApp {
     }
   }
 
-  private async testSchedule() {
+  private async testSchedule(): Promise<void> {
     try {
       this.log('Testing TimeSafari community notification scheduling...');
       const config = this.configLoader.getConfig();
@@ -674,11 +674,11 @@ class TimeSafariAndroidTestApp {
           retryAttempts: 3,
           retryDelay: 5000,
           callbacks: {
-            onSuccess: async (data: Record<string, unknown>) => {
+            onSuccess: async (data: Record<string, unknown>): Promise<void> => {
               this.log('✅ Content fetch successful', data);
               await this.processEndorserNotificationBundle(data);
             },
-            onError: async (error: Record<string, unknown>) => {
+            onError: async (error: Record<string, unknown>): Promise<void> => {
               this.log('❌ Content fetch failed', error);
             }
           }
@@ -714,7 +714,7 @@ class TimeSafariAndroidTestApp {
     }
   }
 
-  private async testEndorserAPI() {
+  private async testEndorserAPI(): Promise<void> {
     try {
       this.log('Testing Endorser.ch API integration...');
       const config = this.configLoader.getConfig();
@@ -763,7 +763,7 @@ class TimeSafariAndroidTestApp {
     }
   }
 
-  private async testCallbacks() {
+  private async testCallbacks(): Promise<void> {
     try {
       this.log('Testing TimeSafari notification callbacks...');
       // const config = this.configLoader.getConfig();
@@ -799,7 +799,7 @@ class TimeSafariAndroidTestApp {
     }
   }
 
-  private async testStatus() {
+  private async testStatus(): Promise<void> {
     try {
       this.log('Testing notification status...');
       const status = await this.notificationService.getDualScheduleStatus();
@@ -810,7 +810,7 @@ class TimeSafariAndroidTestApp {
     }
   }
 
-  private async testPerformance() {
+  private async testPerformance(): Promise<void> {
     try {
       this.log('Testing Android performance metrics...');
       const metrics = {