feat(frontend/library): Make agent input fields expandable

[Pwuts]

• Resolves #9622

Changes 🏗️

• Add pop-out button + modal to input fields in Agent Run Draft view on /library/agents/[id]
• Fix icon-variant button styling

Checklist 📋

For code changes:

• [x] I have clearly listed my changes in the PR description
• [x] I have made a test plan
• [x] I have tested my changes according to the test plan:
  • Go to an agent's page -> click "+ New run"
  • [x] -> pop-out button should show on all input fields
  • Enter a value in one of the inputs; click the pop-out button on that input
  • [x] -> input modal with large text field should open
  • [x] -> the value you just entered should be present in the modal's text field
  • Edit the value & click "Save"
  • [x] -> the modal should close
  • [x] -> the value in the corresponding input field should be updated

[deepsource-io[bot]]

Here's the code health analysis summary for commits 607641c..9664316. View details on DeepSource ↗.

Analysis Summary

Analyzer	Status	Summary	Link
JavaScript	✅ Success	❗ 8 occurences introduced 🎯 5 occurences resolved	View Check ↗
Python	✅ Success		View Check ↗

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