feat: enhance FieldList component

[caio-pizzol]

Note

Replaces the delete button with a top-right trash icon, shows field.id as primary with optional alias subtitle, removes tag display, and adds an alias tooltip.

• UI — src/defaults/FieldList.tsx:
  • Item layout: Make item container position: relative; add title={field.alias} tooltip.
  • Delete control: Replace text button with absolute-positioned trash icon (top-right), hover color change, and click propagation stopped.
  • Field display: Show field.id as primary; render alias as smaller subtitle only when different; remove field.tag rendering.
  • Styling tweaks: Adjust spacing and flex alignment to accommodate new icon.

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[linear]

SD-532 Display Field ID Instead of Alias in Fields List

Summary

Display the field ID instead of the alias in the FieldsList component for clearer identification.

Tasks

• Modify src/defaults/FieldList.tsx to display field.id as the primary text instead of field.alias
• Keep field.tag as the subtitle for additional context
• Ensure the field ID is clearly visible and readable in the list UI
• Update any related tests in src/__tests__/SuperDocTemplateBuilder.test.tsx that assert on displayed field names
• Consider adding the alias as additional information if needed (e.g., as a tooltip or secondary text)

Notes

Currently the FieldList component at src/defaults/FieldList.tsx displays the human-readable alias (e.g., "Customer Name") as the main text. However, for template building purposes, showing the actual field id (e.g., "customer_name" or "field_1234567890") is more useful for users who need to reference these IDs in their systems. The TemplateField type has both id and alias properties - we should display the ID prominently while potentially keeping the alias available for context.