Update implementation gaps doc with completed features

Mark as completed:
- Rate Limiting (custom Next.js implementation)
- Prompt Injection Protection (25+ security patterns)
- Voice Intent Classification (pattern-based NLP)
- Entity Extraction (amounts, times, durations)
- Voice Input Button (FAB with Web Speech API)
- Loading States & Skeletons (15+ components)

Updated statistics: 14/120 features completed (11.7%)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

docs/implementation-gaps.md

@@ -21,10 +21,14 @@ This document identifies features specified in the documentation that are not ye
 - ✅ **Performance Monitoring**: Request duration tracking and slow query detection
 - ✅ **Audit Logging**: Comprehensive audit trail for compliance
 - ✅ **Performance Indexes**: Optimized database queries with composite indexes
+- ✅ **Rate Limiting**: Custom Next.js rate limiter with 5 endpoint configurations
+- ✅ **Prompt Injection Protection**: 25+ security patterns with input sanitization
+- ✅ **Voice Intent Classification**: Pattern-based NLP with entity extraction
+- ✅ **Loading States**: Skeleton screens across all pages for better UX
 
 ### Key Gaps Identified
-- **Backend**: 42 features not implemented (6 completed ✅)
-- **Frontend**: 36 features not implemented
+- **Backend**: 42 features not implemented (9 completed ✅)
+- **Frontend**: 36 features not implemented (2 completed ✅)
 - **Infrastructure**: 18 features not implemented (3 completed ✅)
 - **Testing**: 15 features not implemented
 
@@ -144,10 +148,10 @@ This document identifies features specified in the documentation that are not ye
    - Priority: Medium
    - Impact: International user support
 
-6. **Prompt Injection Protection**
-   - Status: Not implemented
-   - Current: No input sanitization for AI
-   - Needed: Security filters for malicious prompts
+6. **Prompt Injection Protection** ✅ COMPLETED
+   - Status: **IMPLEMENTED**
+   - Current: Comprehensive security system with 25+ regex patterns
+   - Implemented: System manipulation detection, role change blocking, data exfiltration prevention, command injection filters, input validation (length, character analysis), rate limiting (5 suspicious attempts/min)
    - Priority: High
    - Impact: Security vulnerability mitigation
 
@@ -169,17 +173,17 @@ This document identifies features specified in the documentation that are not ye
    - Priority: Medium
    - Impact: International accessibility
 
-3. **Intent Classification System**
-   - Status: Not implemented
-   - Current: No NLP processing
-   - Needed: Pattern matching for feeding/sleep/diaper commands
+3. **Intent Classification System** ✅ COMPLETED
+   - Status: **IMPLEMENTED**
+   - Current: Pattern-based classifier with confidence scoring
+   - Implemented: Feeding/sleep/diaper intent detection, 25 test cases passing, structured data output
    - Priority: High
    - Impact: Accurate command interpretation
 
-4. **Entity Extraction**
-   - Status: Not implemented
-   - Current: No structured data extraction
-   - Needed: Extract amounts, times, durations from speech
+4. **Entity Extraction** ✅ COMPLETED
+   - Status: **IMPLEMENTED**
+   - Current: Comprehensive entity extraction from voice input
+   - Implemented: Extract amounts (ml, oz), durations (minutes, hours), times (now, ago), breast sides (left/right), diaper types (wet/dirty/both)
    - Priority: High
    - Impact: Data quality from voice input
 
@@ -457,10 +461,10 @@ This document identifies features specified in the documentation that are not ye
    - Priority: Low
    - Impact: Ease of use
 
-4. **Voice Input Button**
-   - Status: Not implemented in frontend
-   - Current: Text only
-   - Needed: Microphone button, recording UI
+4. **Voice Input Button** ✅ COMPLETED
+   - Status: **IMPLEMENTED**
+   - Current: Full voice input UI with Web Speech API
+   - Implemented: VoiceFloatingButton (FAB), VoiceInputButton component, useVoiceInput hook, real-time transcription, auto-classification, form auto-fill integration
    - Priority: Medium
    - Impact: Hands-free feature
 
@@ -606,10 +610,10 @@ This document identifies features specified in the documentation that are not ye
    - Priority: High
    - Impact: Mobile accessibility
 
-5. **Loading States & Skeletons**
-   - Status: Not implemented
-   - Current: Blank screens during load
-   - Needed: Skeleton screens for all data loading
+5. **Loading States & Skeletons** ✅ COMPLETED
+   - Status: **IMPLEMENTED**
+   - Current: Comprehensive skeleton screen system
+   - Implemented: LoadingSkeletons.tsx with 15+ components (ActivityCardSkeleton, StatGridSkeleton, FormSkeleton, ChartSkeleton, etc.), integrated across dashboard, analytics, tracking pages (feeding/sleep/diaper)
    - Priority: Medium
    - Impact: Perceived performance
 
@@ -859,10 +863,10 @@ This document identifies features specified in the documentation that are not ye
 
 **Source**: `maternal-app-api-spec.md`, `maternal-app-tech-stack.md`
 
-1. **Rate Limiting**
-   - Status: Not implemented
-   - Current: No request limiting
-   - Needed: 100 requests/minute per user
+1. **Rate Limiting** ✅ COMPLETED
+   - Status: **IMPLEMENTED**
+   - Current: Custom Next.js-native rate limiter
+   - Implemented: In-memory Map-based storage, 5 endpoint configurations (auth: 5/15min, AI: 10/hr, tracking: 30/min, read: 100/min, sensitive: 3/hr), 429 responses with Retry-After headers
    - Priority: High
    - Impact: DDoS protection
 
@@ -1138,11 +1142,11 @@ This document identifies features specified in the documentation that are not ye
 ### Summary Statistics
 
 - **Total Gaps Identified**: 120 features
-  - **Completed**: 9 features ✅ (7.5%)
-  - **Remaining**: 111 features
+  - **Completed**: 14 features ✅ (11.7%)
+  - **Remaining**: 106 features
 - **Critical Priority**: 18 features (2 completed ✅)
-- **High Priority**: 35 features (4 completed ✅)
-- **Medium Priority**: 42 features (3 completed ✅)
+- **High Priority**: 35 features (8 completed ✅)
+- **Medium Priority**: 42 features (4 completed ✅)
 - **Low Priority**: 25 features (0 completed)
 
 ### Key Observations
@@ -1155,6 +1159,10 @@ This document identifies features specified in the documentation that are not ye
    - Redis caching infrastructure
    - Performance monitoring and database optimization
    - Audit logging for compliance
+   - Rate limiting with 5 endpoint configurations
+   - Prompt injection protection with 25+ security patterns
+   - Voice intent classification with entity extraction
+   - Loading states with 15+ skeleton components
 
 3. **Missing Critical Features**: Offline-first functionality, password reset, email verification, and remaining compliance features are the most critical gaps.
 
@@ -1164,7 +1172,7 @@ This document identifies features specified in the documentation that are not ye
 
 6. **Accessibility Gaps**: No evidence of accessibility testing or screen reader support.
 
-7. **Security Hardening**: Basic authentication exists, error handling improved ✅, but still lacks MFA, rate limiting, and comprehensive validation.
+7. **Security Hardening**: Basic authentication exists, error handling improved ✅, rate limiting implemented ✅, prompt injection protection added ✅, but still lacks MFA and comprehensive validation.
 
 ### Next Steps