fix: custom field types settings

[tiagorochaB]

Summary

Adds a per-type settings panel to the custom-field create/edit form. Selecting a
field type (text, number, date, list, file) now reveals only the settings relevant
to that type, and switching types resets the type-specific values cleanly. Also
includes layout fixes so the inputs lay out on a single row without overlapping.

Closes #15

Changes

• New CustomFieldSettings component rendering type-specific inputs: label,
  placeholder, mask (with help link), number/date format, list selection + render
  type, list options (drag-reorderable), file formats multi-select, character
  limit / decimal length steppers, and attribution type.
• Replaced the plain type <Select> with a card/icon type picker in
  custom-field-form.tsx; type is locked when editing an existing field.
• Switching type clears the type-specific fields (TYPE_SPECIFIC_FIELDS) while
  preserving title/description/attribution; list seeds one empty option.
• Extended custom-field-schema.ts with the new optional settings fields and
  their option sets (NUMBER_FORMATS, DATE_FORMATS, LIST_SELECTION_TYPES,
  LIST_RENDER_TYPES, FILE_FORMATS, ATTRIBUTION_TYPES) and max-length consts.
• Responsive grid layout: text uses 4 columns, number 5 columns, others 3; fixed
  row/column gaps and forced w-full on the format select so it no longer shrinks
  when a value is selected.
• Added i18n strings for the new settings across en-US, es-ES, and pt-BR.
• Updated custom-field-form.test.tsx to cover the new behavior.

Type of change

• Bug fix (fix:)
• New feature (feat:)
• Refactor (refactor:)
• Docs only (docs:)
• Tooling / chore (chore:)
• Breaking change

Testing

• pnpm type-check passes
• pnpm lint passes
• pnpm test passes
• Manually verified the change end-to-end: Created each custom field and checked its settings

Screenshots

Notes for reviewers

• Type is intentionally immutable when editing — it changes how data is stored.
• Option-set string values must match what the backend stores (see the schema
  comments).
• The branch is named fix/... and the commit uses fix:, but the change adds a
  feature; flagging in case the squash-merge title should be adjusted.