Feature/add goal icons

[reeeeal-0Xahmed]

Overview

This PR integrates emoji picker functionality into the GoalManager component and connects it to the backend API to persist goal icons.

Changes Made

GoalManager.tsx

• Added emoji picker integration
• Implemented icon selection handler
• Updated Redux state when icon changes
• Added PUT request to persist icon changes

API Integration

• Implemented updateGoal PUT request using axios
• Ensured icon changes persist after refresh

UI Improvements

• Display selected emoji icon in goal cards
• Centered and styled icon for improved UX

Result

• Users can add and change goal icons
• Icons persist after refresh
• Frontend fully integrated with backend API

Backend dependency

Requires backend support for Goal.Icon field and PUT endpoint.