feat: add regex validation to custom text fields

[intivalderas]

Summary

• Adds an optional regex validation pattern to custom text fields, configurable via Settings → Data model → [Object] → [Text field]
• A toggle in the field settings reveals a pattern input and an optional custom error message
• Invalid values show a red border on the cell and a snackbar error when the user tries to save
• Server-side validation also enforces the pattern on record create/update, with a user-friendly error message

Changes

twenty-shared

• FieldMetadataSettings.ts — added validationPattern and validationErrorMessage to FieldMetadataTextSettings

twenty-server

• validate-text-flat-field-metadata.util.ts (new) — validates the regex is syntactically valid on field save
• flat-field-metadata-type-validator.service.ts — wired TEXT to the new validator
• validate-text-field-or-throw.util.ts — enforces the pattern on record value save
• data-arg-processor.service.ts — passes settings to the text validator

twenty-front

• FieldMetadata.ts — extended FieldTextMetadata with validationPattern and validationErrorMessage
• SettingsDataModelFieldTextForm.tsx — toggle + pattern/error message inputs with Zod client-side syntax validation
• TextFieldInput.tsx — live red border feedback + snackbar error on invalid save attempt

Test plan

• Create a custom text field, enable the validation toggle, enter ^BE0[0-9]{9}$ as pattern and Not a valid Belgian VAT number as error message, save
• On a record, click the field and type an invalid value — red border should appear
• Press Enter — save should be blocked and a snackbar error shown
• Type a valid value (BE0123456789) — border clears, Enter saves successfully
• Via API/GraphQL, attempt to set an invalid value — server should return the custom error message

🤖 Generated with Claude Code