Feature: Add Goal Icons and Tests

[dokuparthijoshna-commits]

In this task, I implemented full support for goal icons across the application.

Frontend:

• Extended Goal model to include an optional icon field
• Displayed icon in GoalCard component
• Integrated emoji picker using emoji-mart
• Updated GoalManager to allow selecting and updating icons

Backend/API:

• Added PUT request support to update goals

Testing:

• Added unit test to cover GetGoalsForUser route in GoalControllerTests

This ensures that users can select, update, and persist goal icons successfully.

[gitguardian]

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