docs: add comprehensive Android app analysis and improvement plan

- Add android-app-analysis.md: detailed analysis of /android/app structure and /www integration - Add android-app-improvement-plan.md: phase-based implementation plan for architecture improvements - Add chatgpt-analysis-guide.md: structured prompts for AI analysis of Android test app - Update README.md: add links to new documentation files These documents provide comprehensive guidance for understanding and improving the DailyNotification Android test app architecture.
2025-10-24 09:42:10 +00:00
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+# DailyNotification Android Test App — Implementation Plan (v1)
+
+**Author**: Matthew Raymer  
+**Date**: 2025-10-24  
+**Version**: 1.0.0
+
+## Overview
+
+This document provides a structured implementation plan for improving the DailyNotification Android test app based on the improvement directive. The plan focuses on architecture, code organization, testing, and maintainability improvements.
+
+## Table of Contents
+
+- [Implementation Phases](#implementation-phases)
+- [Architecture Improvements](#architecture-improvements)
+- [Code Organization](#code-organization)
+- [Testing Strategy](#testing-strategy)
+- [Security Hardening](#security-hardening)
+- [Performance & Reliability](#performance--reliability)
+- [Documentation Updates](#documentation-updates)
+- [Task Breakdown](#task-breakdown)
+- [Acceptance Criteria](#acceptance-criteria)
+
+## Implementation Phases
+
+### Phase 1: Foundation
+**Focus**: Core architecture improvements and status matrix
+- [ ] Create status matrix module
+- [ ] Add input schema validation
+- [ ] Centralize exact-alarm gate
+- [ ] Make BootReceiver idempotent
+- [ ] Introduce use-case classes
+
+### Phase 2: Testing & Reliability
+**Focus**: Testing infrastructure and reliability improvements
+- [ ] Refactor test UI into modular scenarios
+- [ ] Add instrumentation tests
+- [ ] Implement error handling improvements
+- [ ] Add structured logging
+
+### Phase 3: Security & Performance
+**Focus**: Security hardening and performance optimization
+- [ ] Implement security hardening
+- [ ] Add performance optimizations
+- [ ] Create diagnostics system
+- [ ] Update documentation
+
+## Architecture Improvements
+
+### 1. Split Monolithic Test UI
+
+**Current State**: 549-line `index.html` with all functionality
+**Target State**: Modular, maintainable UI components
+
+#### Implementation Plan
+```javascript
+// New structure
+www/
+├── index.html (minimal entry point)
+├── ui/
+│   ├── status-matrix.js
+│   ├── test-buttons.js
+│   └── diagnostics.js
+├── lib/
+│   ├── bridge.ts
+│   ├── schema-validation.ts
+│   └── error-handling.ts
+├── scenarios/
+│   ├── plugin-testing.js
+│   ├── notification-testing.js
+│   ├── permission-testing.js
+│   └── channel-testing.js
+└── fixtures/
+    ├── test-data.json
+    └── expected-results.json
+```
+
+#### Key Changes
+- **Modular Components**: Split UI into focused modules
+- **Scenario Runners**: Named test scenarios with fixtures
+- **TypeScript Bridge**: Typed interface to native plugin
+- **Schema Validation**: Input/output validation at boundary
+
+### 2. Native Plugin Layering
+
+**Current State**: 34 supporting classes with mixed responsibilities
+**Target State**: Organized by capability with use-case classes
+
+#### Implementation Plan
+```java
+// New organization
+com.timesafari.dailynotification/
+├── plugin/
+│   └── DailyNotificationPlugin.java (thin facade)
+├── usecases/
+│   ├── ScheduleDaily.java
+│   ├── CheckPermissions.java
+│   ├── OpenSettings.java
+│   └── CollectRuntimeStatus.java
+├── scheduling/
+│   ├── ExactAlarmManager.java
+│   ├── DozeFallbackManager.java
+│   └── BootRescheduleManager.java
+├── permissions/
+│   ├── PermissionManager.java
+│   └── ChannelManager.java
+├── storage/
+│   ├── NotificationStorage.java
+│   └── MigrationManager.java
+└── workers/
+    ├── FetchWorker.java
+    ├── ScheduleWorker.java
+    └── MaintenanceWorker.java
+```
+
+#### Key Changes
+- **Use-Case Classes**: Business logic separated from plugin facade
+- **Capability Grouping**: Related functionality grouped together
+- **Service Locator**: Dependency injection for testability
+- **Thin Plugin Facade**: @PluginMethod methods delegate to use cases
+
+### 3. Bridge Contract (Typed)
+
+**Current State**: Unvalidated JavaScript calls to native methods
+**Target State**: Typed, validated interface with schema enforcement
+
+#### Implementation Plan
+```typescript
+// lib/bridge.ts
+interface DailyNotificationBridge {
+  scheduleDailyNotification(request: ScheduleRequest): Promise<ScheduleResponse>;
+  checkPermissions(): Promise<PermissionStatus>;
+  collectRuntimeStatus(): Promise<RuntimeStatus>;
+  // ... other methods
+}
+
+interface ScheduleRequest {
+  time: string; // HH:mm format
+  title: string; // max 100 chars
+  body: string; // max 500 chars
+  sound: boolean;
+  priority: 'low' | 'default' | 'high';
+}
+
+interface ScheduleResponse {
+  success: boolean;
+  scheduledAt?: number;
+  error?: {
+    code: string;
+    message: string;
+    hint?: string;
+  };
+}
+```
+
+#### Key Changes
+- **TypeScript Interface**: Typed bridge contract
+- **Schema Validation**: Input validation before native calls
+- **Error Standardization**: Canonical error model
+- **Documentation**: API reference with schemas
+
+## Code Organization
+
+### 1. Status Matrix Module
+
+**Purpose**: Single source of truth for runtime capabilities
+**Implementation**: Centralized status collection and display
+
+#### Implementation Plan
+```javascript
+// ui/status-matrix.js
+class StatusMatrix {
+  async collectRuntimeStatus() {
+    return {
+      postNotificationsGranted: await this.checkPostNotifications(),
+      exactAlarmGranted: await this.checkExactAlarm(),
+      channelEnabled: await this.checkChannelStatus(),
+      batteryOptimizationsIgnored: await this.checkBatteryOptimization(),
+      canScheduleNow: await this.canScheduleNow(),
+      lastError: await this.getLastError(),
+      capabilities: await this.getCapabilityMatrix()
+    };
+  }
+
+  renderStatusMatrix(status) {
+    // Render actionable status matrix with buttons
+  }
+}
+```
+
+#### Key Features
+- **Single Source of Truth**: Centralized status collection
+- **Actionable UI**: Buttons to fix issues
+- **Real-time Updates**: Live status monitoring
+- **Diagnostics Export**: JSON export for debugging
+
+### 2. Use-Case Classes
+
+**Purpose**: Business logic separation from plugin facade
+**Implementation**: Thin @PluginMethod methods delegate to use cases
+
+#### Implementation Plan
+```java
+// usecases/ScheduleDaily.java
+public class ScheduleDaily {
+    private final ExactAlarmManager exactAlarmManager;
+    private final DozeFallbackManager dozeFallbackManager;
+    private final NotificationStorage storage;
+
+    public ScheduleResponse execute(ScheduleRequest request) {
+        // Validate input
+        ValidationResult validation = validateRequest(request);
+        if (!validation.isValid()) {
+            return ScheduleResponse.error(validation.getError());
+        }
+
+        // Check prerequisites
+        if (!canScheduleNow()) {
+            return ScheduleResponse.error("E_SCHEDULE_BLOCKED", "Cannot schedule now");
+        }
+
+        // Execute scheduling logic
+        return doSchedule(request);
+    }
+}
+```
+
+#### Key Features
+- **Business Logic**: Core functionality separated from plugin
+- **Dependency Injection**: Testable with mock dependencies
+- **Error Handling**: Standardized error responses
+- **Validation**: Input validation before processing
+
+### 3. Service Locator
+
+**Purpose**: Dependency injection for testability
+**Implementation**: Lightweight DI container
+
+#### Implementation Plan
+```java
+// core/ServiceLocator.java
+public class ServiceLocator {
+    private static final Map<Class<?>, Object> services = new HashMap<>();
+
+    public static <T> void register(Class<T> type, T instance) {
+        services.put(type, instance);
+    }
+
+    public static <T> T get(Class<T> type) {
+        return (T) services.get(type);
+    }
+
+    public static void initialize(Context context) {
+        // Register core services
+        register(WorkManager.class, WorkManager.getInstance(context));
+        register(AlarmManager.class, (AlarmManager) context.getSystemService(Context.ALARM_SERVICE));
+        register(NotificationStorage.class, new NotificationStorage(context));
+        // ... other services
+    }
+}
+```
+
+#### Key Features
+- **Dependency Injection**: Testable service wiring
+- **Service Registration**: Centralized service management
+- **Context Integration**: Android context integration
+- **Testing Support**: Easy mocking for tests
+
+## Testing Strategy
+
+### 1. Scenario-Based Testing
+
+**Current State**: 12 test buttons with mixed functionality
+**Target State**: Named scenarios with expected results
+
+#### Implementation Plan
+```javascript
+// scenarios/notification-testing.js
+class NotificationScenarios {
+  async testImmediateNotification() {
+    const scenario = {
+      name: 'Immediate Notification Test',
+      description: 'Test immediate notification display',
+      expectedResult: 'SUCCESS',
+      timeout: 5000
+    };
+
+    try {
+      const result = await window.Capacitor.Plugins.DailyNotification.scheduleDailyNotification({
+        time: this.getTimeIn5Minutes(),
+        title: 'Test Notification',
+        body: 'This is a test notification',
+        sound: true,
+        priority: 'high'
+      });
+
+      return this.validateResult(result, scenario);
+    } catch (error) {
+      return this.handleError(error, scenario);
+    }
+  }
+
+  async testScheduledNotification() {
+    // Similar pattern for scheduled notifications
+  }
+}
+```
+
+#### Key Features
+- **Named Scenarios**: Clear test descriptions
+- **Expected Results**: Machine-readable outcomes
+- **Error Handling**: Standardized error responses
+- **Timeout Management**: Configurable timeouts
+
+### 2. Instrumentation Tests
+
+**Purpose**: Automated testing of critical paths
+**Implementation**: Android instrumentation tests
+
+#### Implementation Plan
+```java
+// androidTest/NotificationInstrumentationTest.java
+@RunWith(AndroidJUnit4.class)
+public class NotificationInstrumentationTest {
+    @Test
+    public void testChannelDisabledPath() {
+        // Test channel disabled scenario
+        // Verify error handling
+        // Check status matrix updates
+    }
+
+    @Test
+    public void testExactAlarmDeniedPath() {
+        // Test exact alarm denied scenario
+        // Verify fallback behavior
+        // Check graceful degradation
+    }
+
+    @Test
+    public void testBootReschedule() {
+        // Test boot reschedule functionality
+        // Verify idempotent behavior
+        // Check migration handling
+    }
+}
+```
+
+#### Key Features
+- **Critical Path Testing**: Test important user journeys
+- **Error Scenario Testing**: Test error handling paths
+- **Integration Testing**: Test full plugin integration
+- **Automated Validation**: CI/CD integration
+
+### 3. Unit Tests
+
+**Purpose**: Test individual components
+**Implementation**: JUnit tests for use-case classes
+
+#### Implementation Plan
+```java
+// test/ScheduleDailyTest.java
+@RunWith(MockitoJUnitRunner.class)
+public class ScheduleDailyTest {
+    @Mock private ExactAlarmManager exactAlarmManager;
+    @Mock private DozeFallbackManager dozeFallbackManager;
+    @Mock private NotificationStorage storage;
+
+    private ScheduleDaily scheduleDaily;
+
+    @Before
+    public void setUp() {
+        scheduleDaily = new ScheduleDaily(exactAlarmManager, dozeFallbackManager, storage);
+    }
+
+    @Test
+    public void testScheduleWithValidInput() {
+        // Test successful scheduling
+    }
+
+    @Test
+    public void testScheduleWithInvalidInput() {
+        // Test input validation
+    }
+
+    @Test
+    public void testScheduleWhenBlocked() {
+        // Test blocked scheduling
+    }
+}
+```
+
+#### Key Features
+- **Component Testing**: Test individual use cases
+- **Mock Dependencies**: Isolated testing
+- **Edge Case Testing**: Test error conditions
+- **Fast Execution**: Quick feedback loop
+
+## Security Hardening
+
+### 1. Bridge Input Validation
+
+**Purpose**: Validate all inputs before native processing
+**Implementation**: Schema validation at JavaScript boundary
+
+#### Implementation Plan
+```typescript
+// lib/schema-validation.ts
+export class SchemaValidator {
+  validateScheduleRequest(request: any): ValidationResult {
+    const errors: string[] = [];
+
+    // Validate time format
+    if (!this.isValidTimeFormat(request.time)) {
+      errors.push('Time must be in HH:mm format');
+    }
+
+    // Validate title length
+    if (request.title && request.title.length > 100) {
+      errors.push('Title must be 100 characters or less');
+    }
+
+    // Validate body length
+    if (request.body && request.body.length > 500) {
+      errors.push('Body must be 500 characters or less');
+    }
+
+    // Validate boolean fields
+    if (typeof request.sound !== 'boolean') {
+      errors.push('Sound must be a boolean');
+    }
+
+    // Validate priority
+    if (!['low', 'default', 'high'].includes(request.priority)) {
+      errors.push('Priority must be low, default, or high');
+    }
+
+    return {
+      isValid: errors.length === 0,
+      errors
+    };
+  }
+}
+```
+
+#### Key Features
+- **Input Validation**: Validate all inputs
+- **Length Limits**: Prevent oversized inputs
+- **Type Validation**: Ensure correct types
+- **Format Validation**: Validate time formats
+
+### 2. Network Security
+
+**Purpose**: Secure network communication
+**Implementation**: HTTPS enforcement and timeout limits
+
+#### Implementation Plan
+```java
+// network/SecureNetworkClient.java
+public class SecureNetworkClient {
+    private static final int TIMEOUT_SECONDS = 30;
+    private static final int MAX_RESPONSE_SIZE = 1024 * 1024; // 1MB
+
+    public String fetchContent(String url) throws NetworkException {
+        // Enforce HTTPS
+        if (!url.startsWith("https://")) {
+            throw new NetworkException("E_INSECURE_URL", "Only HTTPS URLs allowed");
+        }
+
+        // Set timeouts
+        HttpURLConnection connection = createConnection(url);
+        connection.setConnectTimeout(TIMEOUT_SECONDS * 1000);
+        connection.setReadTimeout(TIMEOUT_SECONDS * 1000);
+
+        // Limit response size
+        long contentLength = connection.getContentLengthLong();
+        if (contentLength > MAX_RESPONSE_SIZE) {
+            throw new NetworkException("E_RESPONSE_TOO_LARGE", "Response too large");
+        }
+
+        return readResponse(connection);
+    }
+}
+```
+
+#### Key Features
+- **HTTPS Enforcement**: Only secure connections
+- **Timeout Limits**: Prevent hanging requests
+- **Size Limits**: Prevent memory exhaustion
+- **Error Handling**: Standardized network errors
+
+### 3. Intent Filter Security
+
+**Purpose**: Secure intent handling
+**Implementation**: Review and secure intent filters
+
+#### Implementation Plan
+```xml
+<!-- AndroidManifest.xml -->
+<receiver
+    android:name="com.timesafari.dailynotification.DailyNotificationReceiver"
+    android:enabled="true"
+    android:exported="false">
+    <intent-filter>
+        <action android:name="com.timesafari.daily.NOTIFICATION" />
+    </intent-filter>
+</receiver>
+
+<receiver
+    android:name="com.timesafari.dailynotification.BootReceiver"
+    android:enabled="true"
+    android:exported="true"
+    android:permission="android.permission.RECEIVE_BOOT_COMPLETED">
+    <intent-filter android:priority="1000">
+        <action android:name="android.intent.action.BOOT_COMPLETED" />
+    </intent-filter>
+</receiver>
+```
+
+#### Key Features
+- **Export Control**: Minimize exported components
+- **Permission Requirements**: Require permissions for exported components
+- **Intent Validation**: Validate incoming intents
+- **Security Review**: Regular security audits
+
+## Performance & Reliability
+
+### 1. WebView Cold-Start Optimization
+
+**Purpose**: Minimize WebView initialization time
+**Implementation**: Lazy loading and preloading strategies
+
+#### Implementation Plan
+```javascript
+// lib/lazy-loader.js
+class LazyLoader {
+  constructor() {
+    this.loadedModules = new Set();
+    this.loadingPromises = new Map();
+  }
+
+  async loadModule(moduleName) {
+    if (this.loadedModules.has(moduleName)) {
+      return;
+    }
+
+    if (this.loadingPromises.has(moduleName)) {
+      return this.loadingPromises.get(moduleName);
+    }
+
+    const loadPromise = this.doLoadModule(moduleName);
+    this.loadingPromises.set(moduleName, loadPromise);
+
+    try {
+      await loadPromise;
+      this.loadedModules.add(moduleName);
+    } finally {
+      this.loadingPromises.delete(moduleName);
+    }
+  }
+
+  async doLoadModule(moduleName) {
+    // Load module dynamically
+    const module = await import(`./modules/${moduleName}.js`);
+    return module;
+  }
+}
+```
+
+#### Key Features
+- **Lazy Loading**: Load modules on demand
+- **Preloading**: Preload critical modules
+- **Caching**: Cache loaded modules
+- **Performance Monitoring**: Track load times
+
+### 2. Worker Backoff Strategy
+
+**Purpose**: Implement exponential backoff with jitter
+**Implementation**: Smart retry logic for background work
+
+#### Implementation Plan
+```java
+// workers/BackoffStrategy.java
+public class BackoffStrategy {
+    private static final long BASE_DELAY_MS = 1000;
+    private static final long MAX_DELAY_MS = 300000; // 5 minutes
+    private static final double BACKOFF_MULTIPLIER = 2.0;
+    private static final double JITTER_FACTOR = 0.1;
+
+    public long calculateDelay(int attemptNumber) {
+        long delay = (long) (BASE_DELAY_MS * Math.pow(BACKOFF_MULTIPLIER, attemptNumber));
+        delay = Math.min(delay, MAX_DELAY_MS);
+        
+        // Add jitter to prevent thundering herd
+        double jitter = delay * JITTER_FACTOR * (Math.random() - 0.5);
+        delay += (long) jitter;
+        
+        return Math.max(delay, 0);
+    }
+}
+```
+
+#### Key Features
+- **Exponential Backoff**: Increasing delay between retries
+- **Jitter**: Random variation to prevent thundering herd
+- **Maximum Delay**: Cap on maximum delay
+- **Configurable**: Adjustable parameters
+
+### 3. Database Hygiene
+
+**Purpose**: Maintain database performance
+**Implementation**: Indexing and periodic cleanup
+
+#### Implementation Plan
+```java
+// storage/DatabaseMaintenance.java
+public class DatabaseMaintenance {
+    private final NotificationStorage storage;
+
+    public void performMaintenance() {
+        // Clean up expired notifications
+        cleanupExpiredNotifications();
+        
+        // Clean up delivered notifications older than 7 days
+        cleanupDeliveredNotifications();
+        
+        // Rebuild indexes if needed
+        rebuildIndexesIfNeeded();
+        
+        // Vacuum database
+        vacuumDatabase();
+    }
+
+    private void cleanupExpiredNotifications() {
+        long cutoffTime = System.currentTimeMillis() - TimeUnit.DAYS.toMillis(7);
+        storage.deleteExpiredNotifications(cutoffTime);
+    }
+}
+```
+
+#### Key Features
+- **Periodic Cleanup**: Regular maintenance tasks
+- **Index Optimization**: Maintain database performance
+- **Data Retention**: Configurable retention policies
+- **Performance Monitoring**: Track maintenance impact
+
+## Documentation Updates
+
+### 1. "How it Works" Documentation
+
+**Purpose**: Explain the system architecture and flow
+**Implementation**: Comprehensive architecture documentation
+
+#### Implementation Plan
+```markdown
+# How It Works
+
+## System Architecture
+
+### App Launch Flow
+1. Android launches MainActivity
+2. Capacitor initializes WebView
+3. Plugin discovery loads DailyNotificationPlugin
+4. JavaScript bridge establishes communication
+5. Web interface loads and initializes
+
+### Notification Scheduling Flow
+1. User triggers schedule action
+2. JavaScript validates input schema
+3. Bridge calls native plugin method
+4. Use-case class processes request
+5. ExactAlarmManager schedules notification
+6. WorkManager handles background processing
+7. NotificationReceiver displays notification
+
+### Error Handling Flow
+1. Error occurs in native code
+2. Error mapped to canonical error code
+3. Error returned through bridge
+4. JavaScript displays user-friendly message
+5. Status matrix updated with error state
+```
+
+#### Key Features
+- **Architecture Diagrams**: Visual system overview
+- **Flow Documentation**: Step-by-step processes
+- **Error Handling**: Error flow documentation
+- **Troubleshooting**: Common issues and solutions
+
+### 2. Runbooks
+
+**Purpose**: Operational procedures for common issues
+**Implementation**: Step-by-step troubleshooting guides
+
+#### Implementation Plan
+```markdown
+# Runbooks
+
+## No Notifications Firing
+
+### Checks
+1. Check status matrix for red indicators
+2. Verify POST_NOTIFICATIONS permission
+3. Check notification channel status
+4. Verify exact alarm permission
+5. Check battery optimization settings
+
+### Fix
+1. Request missing permissions
+2. Enable notification channel
+3. Enable exact alarms in settings
+4. Disable battery optimization
+
+### Verify
+1. Run comprehensive status check
+2. Test immediate notification
+3. Verify scheduled notification
+4. Check logs for errors
+```
+
+#### Key Features
+- **Step-by-Step Procedures**: Clear troubleshooting steps
+- **Check-Fix-Verify**: Structured problem resolution
+- **Common Issues**: Frequent problems and solutions
+- **Escalation Paths**: When to escalate issues
+
+### 3. API Reference
+
+**Purpose**: Complete API documentation
+**Implementation**: Method-by-method documentation
+
+#### Implementation Plan
+```markdown
+# API Reference
+
+## scheduleDailyNotification
+
+### Request Schema
+```typescript
+interface ScheduleRequest {
+  time: string;        // HH:mm format
+  title: string;       // max 100 chars
+  body: string;        // max 500 chars
+  sound: boolean;     // play sound
+  priority: 'low' | 'default' | 'high';
+}
+```
+
+### Response Schema
+```typescript
+interface ScheduleResponse {
+  success: boolean;
+  scheduledAt?: number;
+  error?: {
+    code: string;
+    message: string;
+    hint?: string;
+  };
+}
+```
+
+### Error Codes
+- `E_INVALID_TIME`: Time format invalid
+- `E_TITLE_TOO_LONG`: Title exceeds 100 characters
+- `E_BODY_TOO_LONG`: Body exceeds 500 characters
+- `E_PERMISSION_DENIED`: Required permission not granted
+- `E_CHANNEL_DISABLED`: Notification channel disabled
+```
+
+#### Key Features
+- **Complete API Coverage**: All methods documented
+- **Schema Definitions**: Request/response schemas
+- **Error Codes**: Complete error code reference
+- **Examples**: Usage examples for each method
+
+## Task Breakdown
+
+### Phase 1: Foundation
+- [ ] **Status Matrix Module**
+  - Implement `collectRuntimeStatus()` function
+  - Create status matrix UI component
+  - Add "Copy Diagnostics" functionality
+- [ ] **Input Schema Validation**
+  - Create TypeScript schema definitions
+  - Implement validation at bridge boundary
+  - Add error handling for validation failures
+- [ ] **Exact-Alarm Gate**
+  - Create `ExactAlarmManager` class
+  - Implement graceful fallback logic
+  - Update status matrix to show exact alarm status
+- [ ] **BootReceiver Idempotent**
+  - Add migration fence for old schedules
+  - Implement idempotent rescheduling
+  - Add logging for boot recovery
+- [ ] **Use-Case Classes**
+  - Create `ScheduleDaily` use case
+  - Create `CheckPermissions` use case
+  - Refactor plugin methods to use cases
+
+### Phase 2: Testing & Reliability
+- [ ] **Test UI Refactoring**
+  - Split 549-line HTML into modules
+  - Create scenario runner framework
+  - Implement named test scenarios
+- [ ] **Instrumentation Tests**
+  - Test channel disabled path
+  - Test exact alarm denied path
+  - Test boot reschedule functionality
+- [ ] **Structured Logging**
+  - Add event IDs for all operations
+  - Implement progress logging
+  - Create log export functionality
+
+### Phase 3: Security & Performance
+- [ ] **Security Hardening**
+  - Add network security measures
+  - Review intent filter security
+  - Implement channel policy enforcement
+- [ ] **Performance Optimizations**
+  - Implement lazy loading for UI modules
+  - Add worker backoff strategy
+  - Optimize database operations
+- [ ] **Diagnostics System**
+  - Implement comprehensive diagnostics
+  - Add performance monitoring
+  - Create health check endpoints
+- [ ] **Documentation Updates**
+  - Create "How it Works" documentation
+  - Write runbooks for common issues
+  - Complete API reference
+
+## Acceptance Criteria
+
+### Status Matrix
+- [ ] Reports all relevant runtime capabilities
+- [ ] Shows live channel state
+- [ ] Provides actionable buttons for issues
+- [ ] Exports diagnostics as JSON
+
+### Error Handling
+- [ ] All @PluginMethod calls validate inputs
+- [ ] Returns stable error codes with hints
+- [ ] Maps native exceptions to canonical errors
+- [ ] Provides user-friendly error messages
+
+### Reliability
+- [ ] Reboot scenarios reliably deliver notifications
+- [ ] Doze scenarios degrade gracefully
+- [ ] Clear logs explain system behavior
+- [ ] User-visible reasoning for failures
+
+### Testing
+- [ ] Test UI modularized into scenarios
+- [ ] At least 2 scenarios run as automated tests
+- [ ] Instrumentation tests cover critical paths
+- [ ] Unit tests cover use-case classes
+
+### Documentation
+- [ ] "How it Works" page with lifecycle diagrams
+- [ ] Runbooks for common issues
+- [ ] Complete API reference with schemas
+- [ ] Error codes table with explanations
+
+## Success Metrics
+
+### Code Quality
+- **Maintainability**: Reduced complexity in test UI
+- **Testability**: Use-case classes with dependency injection
+- **Reliability**: Improved error handling and logging
+- **Security**: Input validation and network security
+
+### User Experience
+- **Clarity**: Clear status matrix with actionable items
+- **Reliability**: Consistent notification delivery
+- **Debugging**: Comprehensive diagnostics and logging
+- **Performance**: Faster app startup and response
+
+### Developer Experience
+- **Documentation**: Complete API reference and runbooks
+- **Testing**: Automated test coverage for critical paths
+- **Debugging**: Structured logging and diagnostics
+- **Maintenance**: Modular architecture for easy updates
+
+## Conclusion
+
+This implementation plan provides a structured approach to improving the DailyNotification Android test app. The plan focuses on architecture improvements, code organization, testing, and maintainability while maintaining the existing functionality.
+
+The phased approach allows for incremental improvements while ensuring each phase delivers value. The acceptance criteria provide clear success metrics for each improvement area.
+
+By following this plan, the test app will become more maintainable, reliable, and user-friendly while providing a solid foundation for future enhancements.