Add emoji support with PUT request and unit tests

[blastdanger96]

Changes Made

Backend

• Updated Goal model to include Color field
• Added PUT endpoint to update goal emoji/icon

Frontend

• Added updateGoalEmoji function to lib.ts
• Updated onSelectEmoji in GoalManager.tsx to call PUT request so emoji changes persist after page refresh

Tests

• Updated CommBank.Tests target framework to net8.0
• Implemented GetForUser test in GoalControllerTests.cs
• All 11 tests passing

[gitguardian]

⚠️ GitGuardian has uncovered 1 secret following the scan of your pull request.

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🔎 Detected hardcoded secret in your pull request

GitGuardian id	GitGuardian status	Secret	Commit	Filename
-	-	MongoDB Credentials	041b192	CommBank-Server/Secrets.json	View secret

🛠 Guidelines to remediate hardcoded secrets

1. Understand the implications of revoking this secret by investigating where it is used in your code.
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• following these best practices for managing and storing secrets including API keys and other credentials
• install secret detection on pre-commit to catch secret before it leaves your machine and ease remediation.

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