[FEAT]: Drag and drop for incorrectly mapped fields (e.g. scanned PDFs)

[marcvergees]

📝 Description

Allow users to drag and drop fields that have not been mapped correctly, especially from sources such as scanned PDFs.

💡 Rationale

Imported forms (especially scanned PDFs) often contain fields that aren't mapped properly. Users need an intuitive way to manually assign them to correct data fields within FireForm.

🛠️ Proposed Solution

• Add a UI component for drag-and-drop mapping of unmapped fields.
• Allow users to visually pair source fields with schema targets.
• Support for scanned PDFs and other imported form types.

✅ Acceptance Criteria

• Users can drag unmapped fields and drop them onto target fields.
• Works with scanned PDF imports.
• Feature works in Docker container.
• Documentation updated in docs/.
• JSON output validates against the schema.

📌 Additional Context

This feature is especially useful for agencies dealing with analog forms that have been digitized. It should make mapping much more efficient and reduce errors in data entry.