feat(savings): Goal-Based Savings Tracking & Milestones

[Saj8292008]

Summary

Implements comprehensive goal-based savings tracking that allows users to set financial targets, track progress, and achieve milestones.

🎯 Features Implemented

Core Functionality

• ✅ Create & Manage Goals - Set savings targets with optional deadlines
• ✅ Progress Tracking - Visual progress bars with percentage completion
• ✅ Add/Withdraw Funds - Full transaction management
• ✅ Milestone System - Track achievement at 25%, 50%, 75%, 100%
• ✅ Status Badges - On Track, Behind Schedule, Completed, Overdue
• ✅ Smart Calculations - Days remaining, required daily savings
• ✅ Portfolio Overview - Total saved across all goals

User Interface

• 📱 Responsive design with FinancialCard components
• 🎨 Clean, intuitive goal management interface
• 📊 Visual progress indicators and status badges
• 🔄 Integrated navigation in app menu
• 💰 Clear fund management controls (Add/Withdraw)

Technical Implementation

• API Module: Complete REST API client (api/savings-goals.ts)

  • listSavingsGoals() - Filter by active status, search
  • createSavingsGoal() - With deadline and starting amount
  • updateSavingsGoal() - Modify targets and deadlines
  • deleteSavingsGoal() - Remove completed/abandoned goals
  • addToSavingsGoal() - Deposit funds
  • withdrawFromSavingsGoal() - Withdraw when needed
  • listMilestones() / createMilestone() - Milestone management
  • getGoalProgress() - Detailed progress analytics

• Page Component: Full-featured UI (pages/SavingsGoals.tsx)

  • Goal creation modal with validation
  • Card-based goal display with progress visualization
  • Milestone achievement tracking
  • Quick-action buttons for funds management
  • Empty state with call-to-action

• Navigation: Added to main app navigation menu

🧪 Testing

• ✅ 18 comprehensive tests with 100% API coverage
• ✅ Edge case handling: zero amounts, overdue goals, no deadlines
• ✅ Mock API testing with Jest
• ✅ All tests passing

📋 Acceptance Criteria

• ✅ Production-ready implementation
• ✅ Includes comprehensive tests
• ✅ Documentation included (inline comments + JSDoc)
• ✅ Follows existing code patterns and style
• ✅ TypeScript with full type safety

🔗 Related Work

This feature complements:

• PR feat(auth): detect unusual login behavior and alert users #342 - Login anomaly detection
• PR feat: multi-user household collaboration #343 - Multi-user household
• PR feat(security): device trust management & recognition #344 - Device trust management

💰 Bounty

Fixes #133 ( bounty)

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Ready for review! All acceptance criteria met, tests passing, production-ready code.