Explicit mapping in labels + frontend improvements

[dinmukhamedm]

• Explicitly map {"label": numeric_val} instead of an array and use of indexes.
• Responsive project cards on smaller screens
• Copy button in formatter (spans view)
• Update loader animation (icon)

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[!IMPORTANT] This pull request updates label mapping to use explicit key-value pairs, enhances UI with a copy button and responsive design, updates loader icons, and adjusts CSS variables for consistency.

• Label Mapping:
  • Change from array-based to explicit key-value mapping for labels in evaluator-editor.tsx, add-label-popover.tsx, and add-label.tsx.
• UI Enhancements:
  • Add copy button to formatter.tsx for copying formatted text.
  • Make project cards responsive on smaller screens in projects.tsx.
  • Update loader icon from Loader to Loader2 in multiple components including dataset-panel.tsx, dataset-upload.tsx, and delete-datapoints-dialog.tsx.
• CSS Adjustments:
  • Modify CSS variables in globals.css for better visual consistency.
• Dependency Update:
  • Update next-auth to version 4.24.10 in package.json.

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