agama-project / agama / 26086819313 / 2 – web

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refactor(web): centralize typed validation result helpers for forms

Introduce shared `ValidationResult<T>` and `FieldsValidationResult<T>`
types in `validation-helpers.ts` as the canonical return shapes for form
validation.

- `ValidationResult<T>` represents the final value returned from top-level
  `validate` functions and matches TanStack Form’s `onSubmitAsync`
  validator contract.
- `FieldsValidationResult<T>` represents the intermediate result produced
  by field-group validators before results are merged and `undefined`
  entries are stripped.

Both generics constrain keys to valid form field names via `T`, enabling
compile-time detection of misspelled fields. Centralizing these types
keeps validation behavior consistent across forms, avoids duplicate
`FormFieldErrors` aliases in individual `fields.ts` files, and makes
future updates easier if TanStack Form’s expected validation shape
changes.

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