Form DX Overhaul (FormRef & $ref)

[reecelikesramen]

Introduce FormRef and $ref for declarative, type-safe forms without raw FormData parsing.

[reecelikesramen]

Implemented schema_fields API for the Form component to allow declarative, type-safe form generation from Pydantic models. This directly supports the goal of declarative forms without manual FormData parsing.

Proposed for v0.1.11 release.

Details:

• New @expose method schema_fields on form.wire.
• Extracts metadata (input type, titles, validation rules) from Pydantic models.
• Supports reactive exclusion of fields.
• Verified with unit tests.