Support icons

[Santoshray-27]

Summary

This pull request adds support for goal icons using an emoji picker and persists the selected icon to the backend.

Changes made

• Added an optional icon field to the Goal model
• Displayed goal icons on the goal cards
• Implemented a reusable Emoji Picker component using emoji-mart@3.0.1
• Updated the Goal Manager to allow users to add and change icons
• Added a PUT request in lib.ts to update goals
• Updated Redux state after selecting an emoji
• Persisted emoji changes so they remain after refreshing the page

Testing

• Verified the application builds and runs successfully
• Verified goal cards display emoji icons
• Verified the emoji picker opens when selecting or adding an icon
• Verified selecting an emoji updates the goal icon
• Verified the icon persists after refreshing the client

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