docs: Update TODO list with comprehensive checkmarks for completed items

- Mark metrics & monitoring items as complete
- Update user experience items (permissions, test notifications)
- Mark platform optimizations for Android as complete
- Update integration tests for Android scenarios
- Mark performance tests as complete
- Update API documentation status
- Mark user guides as mostly complete
- Update definition of done items

docs/TODO.md

@@ -62,9 +62,9 @@
 - [x] Add offline fallback content
 
 ### 3.2 Metrics & Monitoring
-- [ ] Create local analytics collection
-- [ ] Implement performance monitoring
-- [ ] Add error tracking and reporting
+- [x] Create local analytics collection
+- [x] Implement performance monitoring
+- [x] Add error tracking and reporting
 - [ ] Create metrics dashboard
 - [ ] Implement user engagement tracking
 
@@ -79,17 +79,17 @@
 
 ### 4.1 User Experience
 - [ ] Create onboarding flow
-- [ ] Add permission request handling
+- [x] Add permission request handling
 - [ ] Implement time picker interface
-- [ ] Add test notification functionality
+- [x] Add test notification functionality
 - [ ] Create troubleshooting guides
 
 ### 4.2 Platform Optimizations
-- [ ] Android: OEM battery settings education
+- [x] Android: OEM battery settings education
 - [ ] iOS: Focus/Summary mode handling
 - [ ] Web: Service worker implementation
 - [ ] Cross-platform synchronization
-- [ ] Performance optimization
+- [x] Performance optimization
 
 ### 4.3 Enterprise Features
 - [ ] Multi-tenant support
@@ -131,33 +131,33 @@
 - [x] Error handling scenarios
 
 ### Integration Tests
-- [ ] Android foreground/background/killed scenarios
+- [x] Android foreground/background/killed scenarios
 - [ ] iOS background/Low Power/Focus modes
-- [ ] Offline at trigger time
-- [ ] Battery saver mode handling
-- [ ] Network state changes
+- [x] Offline at trigger time
+- [x] Battery saver mode handling
+- [x] Network state changes
 
 ### Performance Tests
-- [ ] Memory usage monitoring
-- [ ] Battery impact measurement
-- [ ] Notification delivery latency
-- [ ] Cache performance
-- [ ] Background task efficiency
+- [x] Memory usage monitoring
+- [x] Battery impact measurement
+- [x] Notification delivery latency
+- [x] Cache performance
+- [x] Background task efficiency
 
 ## Documentation Requirements
 
 ### API Documentation
-- [ ] Complete method documentation
-- [ ] Usage examples for each platform
-- [ ] Error handling guides
-- [ ] Performance optimization tips
+- [x] Complete method documentation
+- [x] Usage examples for each platform
+- [x] Error handling guides
+- [x] Performance optimization tips
 - [ ] Troubleshooting playbook
 
 ### User Guides
-- [ ] Installation instructions
-- [ ] Configuration guide
-- [ ] Platform-specific setup
-- [ ] Battery optimization tips
+- [x] Installation instructions
+- [x] Configuration guide
+- [x] Platform-specific setup
+- [x] Battery optimization tips
 - [ ] Common issues and solutions
 
 ## Security Checklist
@@ -173,12 +173,12 @@
 
 ## Definition of Done
 
-- [ ] Notifications deliver daily at user-selected time without network
-- [ ] Graceful fallback chain proven by tests
-- [ ] Metrics recorded locally and viewable
+- [x] Notifications deliver daily at user-selected time without network
+- [x] Graceful fallback chain proven by tests
+- [x] Metrics recorded locally and viewable
 - [ ] Clear onboarding and self-diagnostic screen
-- [ ] Battery/OS constraints documented
-- [ ] User education available for platform-specific settings
+- [x] Battery/OS constraints documented
+- [x] User education available for platform-specific settings
 
 ## Current Status